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Message-ID: <20090610225005.GA25583@elte.hu>
Date: Thu, 11 Jun 2009 00:50:05 +0200
From: Ingo Molnar <mingo@...e.hu>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Frédéric Weisbecker <fweisbec@...il.com>
Subject: [GIT PULL] Tracing updates for v2.6.31
Linus,
Please pull the latest tracing-for-linus git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git tracing-for-linus
This tree underwent a workflow change since the last cycle - instead
of a criss-cross daily merge cycle with lots of merge commit we
transitioned to a fast-forward mostly-linear tree structure. We also
reduced the number of merges drastically via various measures: from
15% down to ~4%.
Hopefully this new tree structure looks nicer than the .30-rc1 one -
with the same good quality.
There's still a lot of tracing changes - with hopefully the last and
near-final tracepoint version. Better runtime filters, continued
conversions to generic event-tracepoints (which show up all at once,
instead of being tied to splintered specialistic plugins),
performance optimizations and much more.
Note: in 'make oldconfig' there's a new menu that shows up by
default if KERNEL_DEBUGGING is enabled - but no new options are
selected by default.
Thanks,
Ingo
------------------>
Alan D. Brunelle (2):
blktrace: correct remap names
blktrace: from-sector redundant in trace_block_remap
Avadh Patel (1):
tracing: add saved_cmdlines file to show cached task comms
Chris Wright (1):
x86: use native register access for native tlb flushing
Christoph Hellwig (1):
tracing: small trave_events sample Makefile cleanup
Frederic Weisbecker (12):
tracing/ftrace: factorize the tracing files creation
tracing/lockdep: report the time waited for a lock
tracing/core: Add current context on tracing recursion warning
tracing/ring-buffer: Add unlock recursion protection on discard
tracing/events: provide string with undefined size support
tracing/lock: provide lock_acquired event support for dynamic size string
tracing/events: protect __get_str()
tracing/filters: support for filters of dynamic sized arrays
tracing/filters: support for operator reserved characters in strings
tracing/stat: replace trace_stat_session by stat_session
tracing/stat: replace linked list by an rbtree for sorting
tracing/stat: remove unappropriate safe walk on list
Heiko Carstens (2):
tracing: fix build failure on s390
trace: disable preemption before taking raw spinlocks
Ingo Molnar (6):
x86, bts: cleanups
x86, bts: detect size of DS fields, fix
mm, x86, ptrace, bts: defer branch trace stopping, cleanup
mm, x86, ptrace, bts: defer branch trace stopping, remove dead code
tracing: make the trace clocks available generally
Revert "x86, bts: reenable ptrace branch trace support"
Jason Baron (3):
kerneldoc, tracing: make kernel-doc understand TRACE_EVENT() macro (take #2)
tracing: add new tracepoints docbook
tracing: add irq tracepoint documentation
Jaswinder Singh Rajput (1):
tracing: trace_output.c, fix false positive compiler warning
Jeremy Fitzhardinge (1):
tracing: avoid warnings from zero-arg tracepoints
Lai Jiangshan (2):
ring_buffer: compressed event header
tracing: add trace_event_read_lock()
Li Zefan (31):
tracing: use macros to denote usec and nsec per second
blktrace: fix output of unknown events
blktrace: fix output of BLK_TC_PC events
blktrace: support per-partition tracing for ftrace plugin
blktrace: add trace/ to /sys/block/sda
blktrace: fix context-info when mixed-using blk tracer and trace events
tracing: fix file mode of trace and README
tracing/filters: don't remove old filters when failed to write subsys->filter
tracing/filters: allow user-input to be integer-like string
tracing/events: make struct trace_entry->type to be int type
tracing/events: don't say hi when loading the trace event sample
tracing/events: make SAMPLE_TRACE_EVENTS default to n
tracing/events: fix memory leak when unloading module
tracing/events: fix concurrent access to ftrace_events list
tracing/events: fix concurrent access to ftrace_events list, fix
tracing/events: clean up for ftrace_set_clr_event()
tracing/events: simplify system_enable_read()
blktrace: pdu_buf of pc events should be unsigned
blktrace: from-sector redundant in trace_block_remap, cleanup
tracing/filters: add missing unlock in a failure path
tracing/filters: fix off-by-one bug
tracing/events: Documentation updates
tracing/events: change the type of __str_loc_item to unsigned short
tracing/stat: change dummpy_cmp() to return -1
tracing/stat: remember to free root node
tracing/stat: do some cleanups
tracing/events: fix a typo in __string() format output
tracing/events: put TP_fast_assign into braces
tracing/events: introduce __dynamic_array()
tracing/events: convert block trace points to TRACE_EVENT()
tracing/events: convert block trace points to TRACE_EVENT(), fix !CONFIG_BLOCK
Markus Metzger (29):
x86, bts: detect size of DS fields
x86, bts: add selftest for BTS
x86, bts: correct comment style in ds.c
x86, hw-branch-tracer: keep resources on stop
x86, hw-branch-tracer: add selftest
x86, bts: use atomic memory allocation
x86, bts: fix race when bts tracer is removed
sched, hw-branch-tracer: add wait_task_context_switch() function to sched.h
mm, x86, ptrace, bts: defer branch trace stopping
x86, bts: wait until traced task has been scheduled out
x86, bts: fix race between per-task and per-cpu branch tracing
x86, bts: use trace_clock_global() for timestamps
x86, debugctlmsr: add _on_cpu variants to debugctlmsr functions
x86, bts, hw-branch-tracer: add _noirq variants to the debug store interface
x86, hw-branch-tracer: allocate selftest iterator on heap
x86, ds: fix compiler warning
x86, ds: fix bounds check in ds selftest
x86, ds: selftest each cpu
x86, ds: add task tracing selftest
x86, ds: add leakage warning
x86, ds: use single debug store cpu configuration
x86, ptrace: add bts context unconditionally
x86, ds: dont use TIF_DEBUGCTLMSR
x86, ds: fix bad ds_reset_pebs()
x86, ds: allow small debug store buffers
x86, ds: support Core i7
x86, ds: fix buffer alignment in debug store selftest
x86, bts: reenable ptrace branch trace support
x86, bts, mm: clean up buffer allocation
Mathieu Desnoyers (1):
tracepoint: trace_sched_migrate_task(): remove parameter
Mike Frysinger (1):
ftrace/documentation: fix typo in function grapher name
Ming Lei (2):
tracing: fix check for return value of register_module_notifier
ftrace: fix check for return value of register_module_notifier in event_trace_init
Pekka Enberg (1):
kmemtrace: fix kernel parameter documentation
Peter Zijlstra (1):
ring-buffer: pass in lockdep class key for reader_lock
Shawn Du (1):
blktrace: support per-partition tracing
Stefan Raspl (1):
blktrace: remove debugfs entries on bad path
Steven Rostedt (111):
tracing: add handler to trace_stat
tracing: add function profiler
tracing: move function profiler data out of function struct
tracing: adding function timings to function profiler
tracing: make the function profiler per cpu
function-graph: add option to calculate graph time or not
tracing: clean up tracing profiler
tracing: remove on the fly allocator from function profiler
tracing: add average time in function to function profiler
function-graph: use int instead of atomic for ftrace_graph_active
x86, function-graph: only save return values on x86_64
ring-buffer: add ring_buffer_discard_commit
tracing/filters: use ring_buffer_discard_commit for discarded events
tracing: consolidate trace and trace_event headers
tracing: create automated trace defines
tracing: make trace_seq operations available for core kernel
tracing/events: move declarations from trace directory to core include
tracing/events: move the ftrace event tracing code to core
tracing/events: convert event call sites to use a link list
tracing/events: add export symbols for trace events in modules
tracing/events: add support for modules to TRACE_EVENT
tracing/events: fix compile for modules disabled
tracing/events: fix lockdep system name
tracing/events: move trace point headers into include/trace/events
tracing/events: add trace-events-sample
ftrace: use module notifier for function tracer
tracing/events: add startup tests for events
tracing/events/ring-buffer: expose format of ring buffer headers to users
tracing/events: perform function tracing in event selftests
tracing/events: enable code with EVENT_TRACING not EVENT_TRACER
tracing: add EXPORT_SYMBOL_GPL for trace commits
tracing: add same level recursion detection
tracing: protect trace_printk from recursion
tracing: remove format attribute of inline function
tracing: change branch profiling to a choice selection
tracing: create menuconfig for tracing infrastructure
tracing: rename EVENT_TRACER config to ENABLE_EVENT_TRACING
tracing/events: call the correct event trace selftest init function
tracing: remove dangling semicolon
tracing: fix recursive test level calculation
tracing: remove recursive test from ring_buffer_event_discard
tracing: use recursive counter over irq level
tracing: use nowakeup version of commit for function event trace tests
ring-buffer: only warn on wrap if buffer is bigger than two pages
tracing/wakeup: move access to wakeup_cpu into spinlock
tracing: increase size of number of possible events
tracing: add size checks for exported ftrace internal structures
tracing: fix cut and paste macro error
tracing/lockdep: convert lockdep to use TRACE_EVENT macro
tracing/irq: convert irq traces to use TRACE_EVENT macro
tracing: remove deprecated TRACE_FORMAT
tracing/events: reuse trace event ids after overflow
tracing/events: make modules have their own file_operations structure
tracing: convert ftrace_dump spinlocks to raw
tracing: fix ref count in splice pages
tracing: only add splice page if entries exist
tracing: have splice only copy full pages
ring-buffer: fix printk output
ring-buffer: export symbols
ring-buffer: add counters for commit overrun and nmi dropped entries
tracing: export stats of ring buffers to userspace
ring-buffer: convert cpu buffer entries to local_t
ring-buffer: record page entries in buffer page descriptor
ring-buffer: have read page swap increment counter with page entries
ring-buffer: disable writers when resetting buffers
tracing: use proper export symbol for tracing api
ring-buffer: move big if statement down
ring-buffer: add benchmark and tester
ring-buffer: remove unneeded conditional in rb_reserve_next
ring-buffer: check for failed allocation in ring buffer benchmark
ring-buffer: make moving the tail page a separate function
ring-buffer: change test to be more latency friendly
tracing: update sample with TRACE_INCLUDE_FILE
tracing: reset ring buffer when removing modules with events
tracing: add hierarchical enabling of events
ring-buffer: remove complex calculations in ring-buffer-test
tracing: append ":*" to internal setting of system events
tracing: have menu default enabled when kernel debug is configured
ring-buffer: only periodically call cond_resched to ring-buffer-benchmark
ring-buffer: add total count in ring-buffer-benchmark
ring-buffer: change WARN_ON from checking preempt_count to preemptible
tracing: initialize return value for __ftrace_set_clr_event
tracing: add trace_set_clr_event to export event enabling function
ring-buffer: replace constants with time macros in ring-buffer-benchmark
ring-buffer: check for divide by zero in ring-buffer-benchmark
ring-buffer: remove type parameter from rb_reserve_next_event
ring-buffer: move calculation of event length
ring-buffer: small optimizations
ring-buffer: use internal time stamp function
ring-buffer: move code around to remove some branches
x86/stacktrace: return 0 instead of -1 for stack ops
tracing: stop stack trace on first empty entry
tracing: add __print_flags for events
tracing: add previous task state info to sched switch event
tracing: add flag output for kmem events
tracing: add __print_symbolic to trace events
tracing: convert irq events to use __print_symbolic
ftrace: add kernel command line function filtering
tracing: fix config options to not show when automatically selected
tracing: combine the default tracers into one config
tracing: remove redundant SOFTIRQ from softirq event traces
tracing: make trace pipe recognize latency format flag
ftrace: do not profile functions when disabled
ring-buffer: try to discard unneeded timestamps
ring-buffer: discard timestamps that are at the start of the buffer
tracing: add annotation to what type of stack trace is recorded
ring-buffer: fix ret in rb_add_time_stamp
tracing: fix the block trace points print size
tracing: add trace_seq_vprint interface
tracing: add protection around module events unload
tracing: do not translate event helper macros in print format
Steven Whitehouse (2):
tracing: add exports to use __print_symbolic and __print_flags from a module
tracing: fix multiple use of __print_flags and __print_symbolic
Stuart Bennett (3):
tracing: x86, mmiotrace: code consistency/legibility improvement
tracing: x86, mmiotrace: refactor clearing/restore of page presence
tracing: x86, mmiotrace: only register for die notifier when tracer active
Theodore Ts'o (2):
tracing: Add documentation for the power tracer
tracing: Document the event tracing system
Tim Abbott (1):
ftrace: use .sched.text, not .text.sched in recordmcount.pl
Tim Bird (1):
ring-buffer: fix bug in ring_buffer_discard_commit
Tom Zanussi (9):
tracing/filters: add run-time field descriptions to TRACE_EVENT_FORMAT events
tracing/filters: add TRACE_EVENT_FORMAT_NOFILTER event macro
tracing/infrastructure: separate event tracer from event support
tracing/filters: use ring_buffer_discard_commit() in filter_check_discard()
tracing/filters: allow on-the-fly filter switching
tracing/filters: add filter_mutex to protect filter predicates
tracing/filters: move preds into event_filter object
tracing/filters: distinguish between signed and unsigned fields
tracing/filters: a better event parser
Zhaolei (12):
ftrace: clean up enable logic for sched_switch
tracing, net, skb tracepoint: make skb tracepoint use the TRACE_EVENT() macro
tracing, kmemtrace: Separate include/trace/kmemtrace.h to kmemtrace part and tracepoint part
tracing, kmemtrace: Make kmem tracepoints use TRACE_EVENT macro
tracing: Remove include/trace/kmem_event_types.h
ftrace: Add task_comm support for trace_event
ftrace: clean up of using ftrace_event_enable_disable()
ftrace: don't convert function's local variable name in macro
ftrace, workqueuetrace: make workqueue tracepoints use TRACE_EVENT macro
trace_workqueue: use list_for_each_entry() instead of list_for_each_entry_safe()
trace_workqueue: remove cpu_workqueue_stats->first_entry
trace_workqueue: remove blank line between each cpu
walimis (3):
tracing/trace_stack: fix the number of entries in the header
tracing/events: fix output format of kernel stack
tracing/events: fix output format of user stack
Documentation/DocBook/Makefile | 3 +-
Documentation/DocBook/tracepoint.tmpl | 89 ++
Documentation/kernel-parameters.txt | 27 +-
Documentation/trace/events.txt | 90 ++
Documentation/trace/ftrace.txt | 2 +-
Documentation/trace/power.txt | 17 +
arch/x86/Kconfig.debug | 9 +
arch/x86/include/asm/ds.h | 82 +-
arch/x86/include/asm/processor.h | 35 +-
arch/x86/include/asm/ptrace.h | 9 +-
arch/x86/include/asm/tlbflush.h | 8 +-
arch/x86/kernel/Makefile | 1 +
arch/x86/kernel/ds.c | 921 +++++++++++-----
arch/x86/kernel/ds_selftest.c | 408 +++++++
arch/x86/kernel/ds_selftest.h | 15 +
arch/x86/kernel/entry_64.S | 19 +-
arch/x86/kernel/process.c | 5 +-
arch/x86/kernel/process_32.c | 3 +-
arch/x86/kernel/process_64.c | 3 +-
arch/x86/kernel/ptrace.c | 284 +++--
arch/x86/kernel/stacktrace.c | 2 +-
arch/x86/mm/kmmio.c | 104 +-
arch/x86/mm/mmio-mod.c | 2 +
block/blk-core.c | 21 +-
block/blk-sysfs.c | 7 +-
block/compat_ioctl.c | 2 +-
block/elevator.c | 8 +-
drivers/md/dm.c | 8 +-
drivers/scsi/sg.c | 1 +
fs/bio.c | 3 +-
include/asm-generic/vmlinux.lds.h | 2 +-
include/linux/blktrace_api.h | 45 +-
include/linux/ftrace.h | 17 +-
include/linux/ftrace_event.h | 172 +++
include/linux/init_task.h | 1 +
include/linux/kmemtrace.h | 25 +
include/linux/mm.h | 7 +-
include/linux/mmiotrace.h | 2 +
include/linux/module.h | 8 +
include/linux/ptrace.h | 10 -
include/linux/ring_buffer.h | 66 +-
include/linux/sched.h | 17 +-
include/linux/slab_def.h | 2 +-
include/linux/slub_def.h | 2 +-
include/linux/trace_seq.h | 92 ++
include/linux/tracepoint.h | 8 +-
include/trace/block.h | 76 --
include/trace/define_trace.h | 75 ++
include/trace/events/block.h | 498 ++++++++
include/trace/events/irq.h | 145 +++
include/trace/events/kmem.h | 231 ++++
include/trace/events/lockdep.h | 96 ++
.../trace/{sched_event_types.h => events/sched.h} | 29 +-
include/trace/events/skb.h | 40 +
include/trace/events/workqueue.h | 100 ++
include/trace/ftrace.h | 591 ++++++++++
include/trace/irq.h | 9 -
include/trace/irq_event_types.h | 55 -
include/trace/kmemtrace.h | 63 -
include/trace/lockdep.h | 9 -
include/trace/lockdep_event_types.h | 44 -
include/trace/sched.h | 9 -
include/trace/skb.h | 11 -
include/trace/trace_event_types.h | 5 -
include/trace/trace_events.h | 5 -
include/trace/workqueue.h | 25 -
init/main.c | 2 +-
kernel/Makefile | 1 +
kernel/exit.c | 6 +-
kernel/fork.c | 9 +-
kernel/irq/handle.c | 5 +-
kernel/kthread.c | 5 +-
kernel/lockdep.c | 16 +-
kernel/module.c | 26 +-
kernel/ptrace.c | 10 -
kernel/sched.c | 55 +-
kernel/signal.c | 4 +-
kernel/softirq.c | 7 +-
kernel/trace/Kconfig | 143 ++-
kernel/trace/Makefile | 20 +-
kernel/trace/blktrace.c | 272 ++++-
kernel/trace/events.c | 14 -
kernel/trace/ftrace.c | 772 ++++++++++++--
kernel/trace/kmemtrace.c | 10 +-
kernel/trace/ring_buffer.c | 777 ++++++++-----
kernel/trace/ring_buffer_benchmark.c | 416 +++++++
kernel/trace/trace.c | 383 ++++---
kernel/trace/trace.h | 243 ++---
kernel/trace/trace_boot.c | 5 +-
kernel/trace/trace_branch.c | 8 +-
kernel/trace/trace_event_profile.c | 24 +-
kernel/trace/trace_event_types.h | 12 +-
kernel/trace/trace_events.c | 839 ++++++++++++---
kernel/trace/trace_events_filter.c | 1204 ++++++++++++++++----
kernel/trace/trace_events_stage_1.h | 39 -
kernel/trace/trace_events_stage_2.h | 176 ---
kernel/trace/trace_events_stage_3.h | 281 -----
kernel/trace/trace_export.c | 110 ++-
kernel/trace/trace_functions_graph.c | 25 +-
kernel/trace/trace_hw_branches.c | 203 ++--
kernel/trace/trace_mmiotrace.c | 6 +-
kernel/trace/trace_output.c | 240 ++++-
kernel/trace/trace_output.h | 34 +-
kernel/trace/trace_power.c | 8 +-
kernel/trace/trace_printk.c | 6 +-
kernel/trace/trace_sched_switch.c | 12 +-
kernel/trace/trace_sched_wakeup.c | 8 +-
kernel/trace/trace_selftest.c | 58 +
kernel/trace/trace_stack.c | 15 +-
kernel/trace/trace_stat.c | 208 +++--
kernel/trace/trace_stat.h | 2 +-
kernel/trace/trace_sysprof.c | 6 +-
kernel/trace/trace_workqueue.c | 25 +-
kernel/workqueue.c | 11 +-
mm/bounce.c | 5 +-
mm/mlock.c | 51 +-
mm/slab.c | 2 +-
mm/slob.c | 2 +-
mm/slub.c | 2 +-
mm/util.c | 11 +-
net/core/drop_monitor.c | 2 +-
net/core/net-traces.c | 4 +-
net/core/skbuff.c | 2 +-
samples/Kconfig | 6 +
samples/Makefile | 2 +-
samples/trace_events/Makefile | 6 +
samples/trace_events/trace-events-sample.c | 52 +
samples/trace_events/trace-events-sample.h | 129 +++
scripts/kernel-doc | 22 +
scripts/recordmcount.pl | 6 +-
130 files changed, 8926 insertions(+), 2919 deletions(-)
create mode 100644 Documentation/DocBook/tracepoint.tmpl
create mode 100644 Documentation/trace/events.txt
create mode 100644 Documentation/trace/power.txt
create mode 100644 arch/x86/kernel/ds_selftest.c
create mode 100644 arch/x86/kernel/ds_selftest.h
create mode 100644 include/linux/ftrace_event.h
create mode 100644 include/linux/kmemtrace.h
create mode 100644 include/linux/trace_seq.h
delete mode 100644 include/trace/block.h
create mode 100644 include/trace/define_trace.h
create mode 100644 include/trace/events/block.h
create mode 100644 include/trace/events/irq.h
create mode 100644 include/trace/events/kmem.h
create mode 100644 include/trace/events/lockdep.h
rename include/trace/{sched_event_types.h => events/sched.h} (91%)
create mode 100644 include/trace/events/skb.h
create mode 100644 include/trace/events/workqueue.h
create mode 100644 include/trace/ftrace.h
delete mode 100644 include/trace/irq.h
delete mode 100644 include/trace/irq_event_types.h
delete mode 100644 include/trace/kmemtrace.h
delete mode 100644 include/trace/lockdep.h
delete mode 100644 include/trace/lockdep_event_types.h
delete mode 100644 include/trace/sched.h
delete mode 100644 include/trace/skb.h
delete mode 100644 include/trace/trace_event_types.h
delete mode 100644 include/trace/trace_events.h
delete mode 100644 include/trace/workqueue.h
delete mode 100644 kernel/trace/events.c
create mode 100644 kernel/trace/ring_buffer_benchmark.c
delete mode 100644 kernel/trace/trace_events_stage_1.h
delete mode 100644 kernel/trace/trace_events_stage_2.h
delete mode 100644 kernel/trace/trace_events_stage_3.h
create mode 100644 samples/trace_events/Makefile
create mode 100644 samples/trace_events/trace-events-sample.c
create mode 100644 samples/trace_events/trace-events-sample.h
diff --git a/Documentation/DocBook/Makefile b/Documentation/DocBook/Makefile
index b1eb661..9632444 100644
--- a/Documentation/DocBook/Makefile
+++ b/Documentation/DocBook/Makefile
@@ -13,7 +13,8 @@ DOCBOOKS := z8530book.xml mcabook.xml device-drivers.xml \
gadget.xml libata.xml mtdnand.xml librs.xml rapidio.xml \
genericirq.xml s390-drivers.xml uio-howto.xml scsi.xml \
mac80211.xml debugobjects.xml sh.xml regulator.xml \
- alsa-driver-api.xml writing-an-alsa-driver.xml
+ alsa-driver-api.xml writing-an-alsa-driver.xml \
+ tracepoint.xml
###
# The build process is as follows (targets):
diff --git a/Documentation/DocBook/tracepoint.tmpl b/Documentation/DocBook/tracepoint.tmpl
new file mode 100644
index 0000000..b0756d0
--- /dev/null
+++ b/Documentation/DocBook/tracepoint.tmpl
@@ -0,0 +1,89 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
+ "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []>
+
+<book id="Tracepoints">
+ <bookinfo>
+ <title>The Linux Kernel Tracepoint API</title>
+
+ <authorgroup>
+ <author>
+ <firstname>Jason</firstname>
+ <surname>Baron</surname>
+ <affiliation>
+ <address>
+ <email>jbaron@...hat.com</email>
+ </address>
+ </affiliation>
+ </author>
+ </authorgroup>
+
+ <legalnotice>
+ <para>
+ This documentation is free software; you can redistribute
+ it and/or modify it under the terms of the GNU General Public
+ License as published by the Free Software Foundation; either
+ version 2 of the License, or (at your option) any later
+ version.
+ </para>
+
+ <para>
+ This program is distributed in the hope that it will be
+ useful, but WITHOUT ANY WARRANTY; without even the implied
+ warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ See the GNU General Public License for more details.
+ </para>
+
+ <para>
+ You should have received a copy of the GNU General Public
+ License along with this program; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ MA 02111-1307 USA
+ </para>
+
+ <para>
+ For more details see the file COPYING in the source
+ distribution of Linux.
+ </para>
+ </legalnotice>
+ </bookinfo>
+
+ <toc></toc>
+ <chapter id="intro">
+ <title>Introduction</title>
+ <para>
+ Tracepoints are static probe points that are located in strategic points
+ throughout the kernel. 'Probes' register/unregister with tracepoints
+ via a callback mechanism. The 'probes' are strictly typed functions that
+ are passed a unique set of parameters defined by each tracepoint.
+ </para>
+
+ <para>
+ From this simple callback mechanism, 'probes' can be used to profile, debug,
+ and understand kernel behavior. There are a number of tools that provide a
+ framework for using 'probes'. These tools include Systemtap, ftrace, and
+ LTTng.
+ </para>
+
+ <para>
+ Tracepoints are defined in a number of header files via various macros. Thus,
+ the purpose of this document is to provide a clear accounting of the available
+ tracepoints. The intention is to understand not only what tracepoints are
+ available but also to understand where future tracepoints might be added.
+ </para>
+
+ <para>
+ The API presented has functions of the form:
+ <function>trace_tracepointname(function parameters)</function>. These are the
+ tracepoints callbacks that are found throughout the code. Registering and
+ unregistering probes with these callback sites is covered in the
+ <filename>Documentation/trace/*</filename> directory.
+ </para>
+ </chapter>
+
+ <chapter id="irq">
+ <title>IRQ</title>
+!Iinclude/trace/events/irq.h
+ </chapter>
+
+</book>
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index e87bdbf..fcd3bfb 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -56,7 +56,6 @@ parameter is applicable:
ISAPNP ISA PnP code is enabled.
ISDN Appropriate ISDN support is enabled.
JOY Appropriate joystick support is enabled.
- KMEMTRACE kmemtrace is enabled.
LIBATA Libata driver is enabled
LP Printer support is enabled.
LOOP Loopback device support is enabled.
@@ -752,12 +751,25 @@ and is between 256 and 4096 characters. It is defined in the file
ia64_pal_cache_flush instead of SAL_CACHE_FLUSH.
ftrace=[tracer]
- [ftrace] will set and start the specified tracer
+ [FTRACE] will set and start the specified tracer
as early as possible in order to facilitate early
boot debugging.
ftrace_dump_on_oops
- [ftrace] will dump the trace buffers on oops.
+ [FTRACE] will dump the trace buffers on oops.
+
+ ftrace_filter=[function-list]
+ [FTRACE] Limit the functions traced by the function
+ tracer at boot up. function-list is a comma separated
+ list of functions. This list can be changed at run
+ time by the set_ftrace_filter file in the debugfs
+ tracing directory.
+
+ ftrace_notrace=[function-list]
+ [FTRACE] Do not trace the functions specified in
+ function-list. This list can be changed at run time
+ by the set_ftrace_notrace file in the debugfs
+ tracing directory.
gamecon.map[2|3]=
[HW,JOY] Multisystem joystick and NES/SNES/PSX pad
@@ -1054,15 +1066,6 @@ and is between 256 and 4096 characters. It is defined in the file
use the HighMem zone if it exists, and the Normal
zone if it does not.
- kmemtrace.enable= [KNL,KMEMTRACE] Format: { yes | no }
- Controls whether kmemtrace is enabled
- at boot-time.
-
- kmemtrace.subbufs=n [KNL,KMEMTRACE] Overrides the number of
- subbufs kmemtrace's relay channel has. Set this
- higher than default (KMEMTRACE_N_SUBBUFS in code) if
- you experience buffer overruns.
-
kgdboc= [HW] kgdb over consoles.
Requires a tty driver that supports console polling.
(only serial suported for now)
diff --git a/Documentation/trace/events.txt b/Documentation/trace/events.txt
new file mode 100644
index 0000000..f157d75
--- /dev/null
+++ b/Documentation/trace/events.txt
@@ -0,0 +1,90 @@
+ Event Tracing
+
+ Documentation written by Theodore Ts'o
+ Updated by Li Zefan
+
+1. Introduction
+===============
+
+Tracepoints (see Documentation/trace/tracepoints.txt) can be used
+without creating custom kernel modules to register probe functions
+using the event tracing infrastructure.
+
+Not all tracepoints can be traced using the event tracing system;
+the kernel developer must provide code snippets which define how the
+tracing information is saved into the tracing buffer, and how the
+tracing information should be printed.
+
+2. Using Event Tracing
+======================
+
+2.1 Via the 'set_event' interface
+---------------------------------
+
+The events which are available for tracing can be found in the file
+/debug/tracing/available_events.
+
+To enable a particular event, such as 'sched_wakeup', simply echo it
+to /debug/tracing/set_event. For example:
+
+ # echo sched_wakeup >> /debug/tracing/set_event
+
+[ Note: '>>' is necessary, otherwise it will firstly disable
+ all the events. ]
+
+To disable an event, echo the event name to the set_event file prefixed
+with an exclamation point:
+
+ # echo '!sched_wakeup' >> /debug/tracing/set_event
+
+To disable all events, echo an empty line to the set_event file:
+
+ # echo > /debug/tracing/set_event
+
+To enable all events, echo '*:*' or '*:' to the set_event file:
+
+ # echo *:* > /debug/tracing/set_event
+
+The events are organized into subsystems, such as ext4, irq, sched,
+etc., and a full event name looks like this: <subsystem>:<event>. The
+subsystem name is optional, but it is displayed in the available_events
+file. All of the events in a subsystem can be specified via the syntax
+"<subsystem>:*"; for example, to enable all irq events, you can use the
+command:
+
+ # echo 'irq:*' > /debug/tracing/set_event
+
+2.2 Via the 'enable' toggle
+---------------------------
+
+The events available are also listed in /debug/tracing/events/ hierarchy
+of directories.
+
+To enable event 'sched_wakeup':
+
+ # echo 1 > /debug/tracing/events/sched/sched_wakeup/enable
+
+To disable it:
+
+ # echo 0 > /debug/tracing/events/sched/sched_wakeup/enable
+
+To enable all events in sched subsystem:
+
+ # echo 1 > /debug/tracing/events/sched/enable
+
+To eanble all events:
+
+ # echo 1 > /debug/tracing/events/enable
+
+When reading one of these enable files, there are four results:
+
+ 0 - all events this file affects are disabled
+ 1 - all events this file affects are enabled
+ X - there is a mixture of events enabled and disabled
+ ? - this file does not affect any event
+
+3. Defining an event-enabled tracepoint
+=======================================
+
+See The example provided in samples/trace_events
+
diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt
index fd9a3e6..5ad2ded 100644
--- a/Documentation/trace/ftrace.txt
+++ b/Documentation/trace/ftrace.txt
@@ -179,7 +179,7 @@ Here is the list of current tracers that may be configured.
Function call tracer to trace all kernel functions.
- "function_graph_tracer"
+ "function_graph"
Similar to the function tracer except that the
function tracer probes the functions on their entry
diff --git a/Documentation/trace/power.txt b/Documentation/trace/power.txt
new file mode 100644
index 0000000..cd805e1
--- /dev/null
+++ b/Documentation/trace/power.txt
@@ -0,0 +1,17 @@
+The power tracer collects detailed information about C-state and P-state
+transitions, instead of just looking at the high-level "average"
+information.
+
+There is a helper script found in scrips/tracing/power.pl in the kernel
+sources which can be used to parse this information and create a
+Scalable Vector Graphics (SVG) picture from the trace data.
+
+To use this tracer:
+
+ echo 0 > /sys/kernel/debug/tracing/tracing_enabled
+ echo power > /sys/kernel/debug/tracing/current_tracer
+ echo 1 > /sys/kernel/debug/tracing/tracing_enabled
+ sleep 1
+ echo 0 > /sys/kernel/debug/tracing/tracing_enabled
+ cat /sys/kernel/debug/tracing/trace | \
+ perl scripts/tracing/power.pl > out.sv
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index d8359e7..22b752e 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -167,6 +167,15 @@ config IOMMU_LEAK
Add a simple leak tracer to the IOMMU code. This is useful when you
are debugging a buggy device driver that leaks IOMMU mappings.
+config X86_DS_SELFTEST
+ bool "DS selftest"
+ default y
+ depends on DEBUG_KERNEL
+ depends on X86_DS
+ ---help---
+ Perform Debug Store selftests at boot time.
+ If in doubt, say "N".
+
config HAVE_MMIOTRACE_SUPPORT
def_bool y
diff --git a/arch/x86/include/asm/ds.h b/arch/x86/include/asm/ds.h
index a8f672b..70dac19 100644
--- a/arch/x86/include/asm/ds.h
+++ b/arch/x86/include/asm/ds.h
@@ -15,8 +15,8 @@
* - buffer allocation (memory accounting)
*
*
- * Copyright (C) 2007-2008 Intel Corporation.
- * Markus Metzger <markus.t.metzger@...el.com>, 2007-2008
+ * Copyright (C) 2007-2009 Intel Corporation.
+ * Markus Metzger <markus.t.metzger@...el.com>, 2007-2009
*/
#ifndef _ASM_X86_DS_H
@@ -83,8 +83,10 @@ enum ds_feature {
* The interrupt threshold is independent from the overflow callback
* to allow users to use their own overflow interrupt handling mechanism.
*
- * task: the task to request recording for;
- * NULL for per-cpu recording on the current cpu
+ * The function might sleep.
+ *
+ * task: the task to request recording for
+ * cpu: the cpu to request recording for
* base: the base pointer for the (non-pageable) buffer;
* size: the size of the provided buffer in bytes
* ovfl: pointer to a function to be called on buffer overflow;
@@ -93,19 +95,28 @@ enum ds_feature {
* -1 if no interrupt threshold is requested.
* flags: a bit-mask of the above flags
*/
-extern struct bts_tracer *ds_request_bts(struct task_struct *task,
- void *base, size_t size,
- bts_ovfl_callback_t ovfl,
- size_t th, unsigned int flags);
-extern struct pebs_tracer *ds_request_pebs(struct task_struct *task,
- void *base, size_t size,
- pebs_ovfl_callback_t ovfl,
- size_t th, unsigned int flags);
+extern struct bts_tracer *ds_request_bts_task(struct task_struct *task,
+ void *base, size_t size,
+ bts_ovfl_callback_t ovfl,
+ size_t th, unsigned int flags);
+extern struct bts_tracer *ds_request_bts_cpu(int cpu, void *base, size_t size,
+ bts_ovfl_callback_t ovfl,
+ size_t th, unsigned int flags);
+extern struct pebs_tracer *ds_request_pebs_task(struct task_struct *task,
+ void *base, size_t size,
+ pebs_ovfl_callback_t ovfl,
+ size_t th, unsigned int flags);
+extern struct pebs_tracer *ds_request_pebs_cpu(int cpu,
+ void *base, size_t size,
+ pebs_ovfl_callback_t ovfl,
+ size_t th, unsigned int flags);
/*
* Release BTS or PEBS resources
* Suspend and resume BTS or PEBS tracing
*
+ * Must be called with irq's enabled.
+ *
* tracer: the tracer handle returned from ds_request_~()
*/
extern void ds_release_bts(struct bts_tracer *tracer);
@@ -115,6 +126,28 @@ extern void ds_release_pebs(struct pebs_tracer *tracer);
extern void ds_suspend_pebs(struct pebs_tracer *tracer);
extern void ds_resume_pebs(struct pebs_tracer *tracer);
+/*
+ * Release BTS or PEBS resources
+ * Suspend and resume BTS or PEBS tracing
+ *
+ * Cpu tracers must call this on the traced cpu.
+ * Task tracers must call ds_release_~_noirq() for themselves.
+ *
+ * May be called with irq's disabled.
+ *
+ * Returns 0 if successful;
+ * -EPERM if the cpu tracer does not trace the current cpu.
+ * -EPERM if the task tracer does not trace itself.
+ *
+ * tracer: the tracer handle returned from ds_request_~()
+ */
+extern int ds_release_bts_noirq(struct bts_tracer *tracer);
+extern int ds_suspend_bts_noirq(struct bts_tracer *tracer);
+extern int ds_resume_bts_noirq(struct bts_tracer *tracer);
+extern int ds_release_pebs_noirq(struct pebs_tracer *tracer);
+extern int ds_suspend_pebs_noirq(struct pebs_tracer *tracer);
+extern int ds_resume_pebs_noirq(struct pebs_tracer *tracer);
+
/*
* The raw DS buffer state as it is used for BTS and PEBS recording.
@@ -170,9 +203,9 @@ struct bts_struct {
} lbr;
/* BTS_TASK_ARRIVES or BTS_TASK_DEPARTS */
struct {
- __u64 jiffies;
+ __u64 clock;
pid_t pid;
- } timestamp;
+ } event;
} variant;
};
@@ -201,8 +234,12 @@ struct bts_trace {
struct pebs_trace {
struct ds_trace ds;
- /* the PEBS reset value */
- unsigned long long reset_value;
+ /* the number of valid counters in the below array */
+ unsigned int counters;
+
+#define MAX_PEBS_COUNTERS 4
+ /* the counter reset value */
+ unsigned long long counter_reset[MAX_PEBS_COUNTERS];
};
@@ -237,9 +274,11 @@ extern int ds_reset_pebs(struct pebs_tracer *tracer);
* Returns 0 on success; -Eerrno on error
*
* tracer: the tracer handle returned from ds_request_pebs()
+ * counter: the index of the counter
* value: the new counter reset value
*/
-extern int ds_set_pebs_reset(struct pebs_tracer *tracer, u64 value);
+extern int ds_set_pebs_reset(struct pebs_tracer *tracer,
+ unsigned int counter, u64 value);
/*
* Initialization
@@ -252,21 +291,12 @@ extern void __cpuinit ds_init_intel(struct cpuinfo_x86 *);
*/
extern void ds_switch_to(struct task_struct *prev, struct task_struct *next);
-/*
- * Task clone/init and cleanup work
- */
-extern void ds_copy_thread(struct task_struct *tsk, struct task_struct *father);
-extern void ds_exit_thread(struct task_struct *tsk);
-
#else /* CONFIG_X86_DS */
struct cpuinfo_x86;
static inline void __cpuinit ds_init_intel(struct cpuinfo_x86 *ignored) {}
static inline void ds_switch_to(struct task_struct *prev,
struct task_struct *next) {}
-static inline void ds_copy_thread(struct task_struct *tsk,
- struct task_struct *father) {}
-static inline void ds_exit_thread(struct task_struct *tsk) {}
#endif /* CONFIG_X86_DS */
#endif /* _ASM_X86_DS_H */
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index c2cceae..0b2fab0 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -460,14 +460,8 @@ struct thread_struct {
unsigned io_bitmap_max;
/* MSR_IA32_DEBUGCTLMSR value to switch in if TIF_DEBUGCTLMSR is set. */
unsigned long debugctlmsr;
-#ifdef CONFIG_X86_DS
-/* Debug Store context; see include/asm-x86/ds.h; goes into MSR_IA32_DS_AREA */
+ /* Debug Store context; see asm/ds.h */
struct ds_context *ds_ctx;
-#endif /* CONFIG_X86_DS */
-#ifdef CONFIG_X86_PTRACE_BTS
-/* the signal to send on a bts buffer overflow */
- unsigned int bts_ovfl_signal;
-#endif /* CONFIG_X86_PTRACE_BTS */
};
static inline unsigned long native_get_debugreg(int regno)
@@ -795,6 +789,21 @@ static inline unsigned long get_debugctlmsr(void)
return debugctlmsr;
}
+static inline unsigned long get_debugctlmsr_on_cpu(int cpu)
+{
+ u64 debugctlmsr = 0;
+ u32 val1, val2;
+
+#ifndef CONFIG_X86_DEBUGCTLMSR
+ if (boot_cpu_data.x86 < 6)
+ return 0;
+#endif
+ rdmsr_on_cpu(cpu, MSR_IA32_DEBUGCTLMSR, &val1, &val2);
+ debugctlmsr = val1 | ((u64)val2 << 32);
+
+ return debugctlmsr;
+}
+
static inline void update_debugctlmsr(unsigned long debugctlmsr)
{
#ifndef CONFIG_X86_DEBUGCTLMSR
@@ -804,6 +813,18 @@ static inline void update_debugctlmsr(unsigned long debugctlmsr)
wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
}
+static inline void update_debugctlmsr_on_cpu(int cpu,
+ unsigned long debugctlmsr)
+{
+#ifndef CONFIG_X86_DEBUGCTLMSR
+ if (boot_cpu_data.x86 < 6)
+ return;
+#endif
+ wrmsr_on_cpu(cpu, MSR_IA32_DEBUGCTLMSR,
+ (u32)((u64)debugctlmsr),
+ (u32)((u64)debugctlmsr >> 32));
+}
+
/*
* from system description table in BIOS. Mostly for MCA use, but
* others may find it useful:
diff --git a/arch/x86/include/asm/ptrace.h b/arch/x86/include/asm/ptrace.h
index e304b66..5cdd19f 100644
--- a/arch/x86/include/asm/ptrace.h
+++ b/arch/x86/include/asm/ptrace.h
@@ -235,12 +235,11 @@ extern int do_get_thread_area(struct task_struct *p, int idx,
extern int do_set_thread_area(struct task_struct *p, int idx,
struct user_desc __user *info, int can_allocate);
-extern void x86_ptrace_untrace(struct task_struct *);
-extern void x86_ptrace_fork(struct task_struct *child,
- unsigned long clone_flags);
+#ifdef CONFIG_X86_PTRACE_BTS
+extern void ptrace_bts_untrace(struct task_struct *tsk);
-#define arch_ptrace_untrace(tsk) x86_ptrace_untrace(tsk)
-#define arch_ptrace_fork(child, flags) x86_ptrace_fork(child, flags)
+#define arch_ptrace_untrace(tsk) ptrace_bts_untrace(tsk)
+#endif /* CONFIG_X86_PTRACE_BTS */
#endif /* __KERNEL__ */
diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
index 16a5c84..a5ecc9c 100644
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -17,7 +17,7 @@
static inline void __native_flush_tlb(void)
{
- write_cr3(read_cr3());
+ native_write_cr3(native_read_cr3());
}
static inline void __native_flush_tlb_global(void)
@@ -32,11 +32,11 @@ static inline void __native_flush_tlb_global(void)
*/
raw_local_irq_save(flags);
- cr4 = read_cr4();
+ cr4 = native_read_cr4();
/* clear PGE */
- write_cr4(cr4 & ~X86_CR4_PGE);
+ native_write_cr4(cr4 & ~X86_CR4_PGE);
/* write old PGE again and flush TLBs */
- write_cr4(cr4);
+ native_write_cr4(cr4);
raw_local_irq_restore(flags);
}
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 145cce7..77df4d6 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -44,6 +44,7 @@ obj-y += process.o
obj-y += i387.o xsave.o
obj-y += ptrace.o
obj-$(CONFIG_X86_DS) += ds.o
+obj-$(CONFIG_X86_DS_SELFTEST) += ds_selftest.o
obj-$(CONFIG_X86_32) += tls.o
obj-$(CONFIG_IA32_EMULATION) += tls.o
obj-y += step.o
diff --git a/arch/x86/kernel/ds.c b/arch/x86/kernel/ds.c
index 87b67e3..48bfe13 100644
--- a/arch/x86/kernel/ds.c
+++ b/arch/x86/kernel/ds.c
@@ -19,45 +19,61 @@
* Markus Metzger <markus.t.metzger@...el.com>, 2007-2009
*/
-
-#include <asm/ds.h>
-
-#include <linux/errno.h>
+#include <linux/kernel.h>
#include <linux/string.h>
-#include <linux/slab.h>
+#include <linux/errno.h>
#include <linux/sched.h>
+#include <linux/slab.h>
#include <linux/mm.h>
-#include <linux/kernel.h>
+#include <linux/trace_clock.h>
+
+#include <asm/ds.h>
+#include "ds_selftest.h"
/*
- * The configuration for a particular DS hardware implementation.
+ * The configuration for a particular DS hardware implementation:
*/
struct ds_configuration {
- /* the name of the configuration */
- const char *name;
- /* the size of one pointer-typed field in the DS structure and
- in the BTS and PEBS buffers in bytes;
- this covers the first 8 DS fields related to buffer management. */
- unsigned char sizeof_field;
- /* the size of a BTS/PEBS record in bytes */
- unsigned char sizeof_rec[2];
- /* a series of bit-masks to control various features indexed
- * by enum ds_feature */
- unsigned long ctl[dsf_ctl_max];
+ /* The name of the configuration: */
+ const char *name;
+
+ /* The size of pointer-typed fields in DS, BTS, and PEBS: */
+ unsigned char sizeof_ptr_field;
+
+ /* The size of a BTS/PEBS record in bytes: */
+ unsigned char sizeof_rec[2];
+
+ /* The number of pebs counter reset values in the DS structure. */
+ unsigned char nr_counter_reset;
+
+ /* Control bit-masks indexed by enum ds_feature: */
+ unsigned long ctl[dsf_ctl_max];
};
-static DEFINE_PER_CPU(struct ds_configuration, ds_cfg_array);
+static struct ds_configuration ds_cfg __read_mostly;
+
+
+/* Maximal size of a DS configuration: */
+#define MAX_SIZEOF_DS 0x80
-#define ds_cfg per_cpu(ds_cfg_array, smp_processor_id())
+/* Maximal size of a BTS record: */
+#define MAX_SIZEOF_BTS (3 * 8)
-#define MAX_SIZEOF_DS (12 * 8) /* maximal size of a DS configuration */
-#define MAX_SIZEOF_BTS (3 * 8) /* maximal size of a BTS record */
-#define DS_ALIGNMENT (1 << 3) /* BTS and PEBS buffer alignment */
+/* BTS and PEBS buffer alignment: */
+#define DS_ALIGNMENT (1 << 3)
-#define BTS_CONTROL \
- (ds_cfg.ctl[dsf_bts] | ds_cfg.ctl[dsf_bts_kernel] | ds_cfg.ctl[dsf_bts_user] |\
- ds_cfg.ctl[dsf_bts_overflow])
+/* Number of buffer pointers in DS: */
+#define NUM_DS_PTR_FIELDS 8
+/* Size of a pebs reset value in DS: */
+#define PEBS_RESET_FIELD_SIZE 8
+
+/* Mask of control bits in the DS MSR register: */
+#define BTS_CONTROL \
+ ( ds_cfg.ctl[dsf_bts] | \
+ ds_cfg.ctl[dsf_bts_kernel] | \
+ ds_cfg.ctl[dsf_bts_user] | \
+ ds_cfg.ctl[dsf_bts_overflow] )
/*
* A BTS or PEBS tracer.
@@ -66,29 +82,36 @@ static DEFINE_PER_CPU(struct ds_configuration, ds_cfg_array);
* to identify tracers.
*/
struct ds_tracer {
- /* the DS context (partially) owned by this tracer */
- struct ds_context *context;
- /* the buffer provided on ds_request() and its size in bytes */
- void *buffer;
- size_t size;
+ /* The DS context (partially) owned by this tracer. */
+ struct ds_context *context;
+ /* The buffer provided on ds_request() and its size in bytes. */
+ void *buffer;
+ size_t size;
};
struct bts_tracer {
- /* the common DS part */
- struct ds_tracer ds;
- /* the trace including the DS configuration */
- struct bts_trace trace;
- /* buffer overflow notification function */
- bts_ovfl_callback_t ovfl;
+ /* The common DS part: */
+ struct ds_tracer ds;
+
+ /* The trace including the DS configuration: */
+ struct bts_trace trace;
+
+ /* Buffer overflow notification function: */
+ bts_ovfl_callback_t ovfl;
+
+ /* Active flags affecting trace collection. */
+ unsigned int flags;
};
struct pebs_tracer {
- /* the common DS part */
- struct ds_tracer ds;
- /* the trace including the DS configuration */
- struct pebs_trace trace;
- /* buffer overflow notification function */
- pebs_ovfl_callback_t ovfl;
+ /* The common DS part: */
+ struct ds_tracer ds;
+
+ /* The trace including the DS configuration: */
+ struct pebs_trace trace;
+
+ /* Buffer overflow notification function: */
+ pebs_ovfl_callback_t ovfl;
};
/*
@@ -97,6 +120,7 @@ struct pebs_tracer {
*
* The DS configuration consists of the following fields; different
* architetures vary in the size of those fields.
+ *
* - double-word aligned base linear address of the BTS buffer
* - write pointer into the BTS buffer
* - end linear address of the BTS buffer (one byte beyond the end of
@@ -135,21 +159,22 @@ enum ds_field {
};
enum ds_qualifier {
- ds_bts = 0,
+ ds_bts = 0,
ds_pebs
};
-static inline unsigned long ds_get(const unsigned char *base,
- enum ds_qualifier qual, enum ds_field field)
+static inline unsigned long
+ds_get(const unsigned char *base, enum ds_qualifier qual, enum ds_field field)
{
- base += (ds_cfg.sizeof_field * (field + (4 * qual)));
+ base += (ds_cfg.sizeof_ptr_field * (field + (4 * qual)));
return *(unsigned long *)base;
}
-static inline void ds_set(unsigned char *base, enum ds_qualifier qual,
- enum ds_field field, unsigned long value)
+static inline void
+ds_set(unsigned char *base, enum ds_qualifier qual, enum ds_field field,
+ unsigned long value)
{
- base += (ds_cfg.sizeof_field * (field + (4 * qual)));
+ base += (ds_cfg.sizeof_ptr_field * (field + (4 * qual)));
(*(unsigned long *)base) = value;
}
@@ -159,7 +184,6 @@ static inline void ds_set(unsigned char *base, enum ds_qualifier qual,
*/
static DEFINE_SPINLOCK(ds_lock);
-
/*
* We either support (system-wide) per-cpu or per-thread allocation.
* We distinguish the two based on the task_struct pointer, where a
@@ -178,12 +202,28 @@ static DEFINE_SPINLOCK(ds_lock);
*/
static atomic_t tracers = ATOMIC_INIT(0);
-static inline void get_tracer(struct task_struct *task)
+static inline int get_tracer(struct task_struct *task)
{
- if (task)
+ int error;
+
+ spin_lock_irq(&ds_lock);
+
+ if (task) {
+ error = -EPERM;
+ if (atomic_read(&tracers) < 0)
+ goto out;
atomic_inc(&tracers);
- else
+ } else {
+ error = -EPERM;
+ if (atomic_read(&tracers) > 0)
+ goto out;
atomic_dec(&tracers);
+ }
+
+ error = 0;
+out:
+ spin_unlock_irq(&ds_lock);
+ return error;
}
static inline void put_tracer(struct task_struct *task)
@@ -194,14 +234,6 @@ static inline void put_tracer(struct task_struct *task)
atomic_inc(&tracers);
}
-static inline int check_tracer(struct task_struct *task)
-{
- return task ?
- (atomic_read(&tracers) >= 0) :
- (atomic_read(&tracers) <= 0);
-}
-
-
/*
* The DS context is either attached to a thread or to a cpu:
* - in the former case, the thread_struct contains a pointer to the
@@ -213,61 +245,58 @@ static inline int check_tracer(struct task_struct *task)
* deallocated when the last user puts the context.
*/
struct ds_context {
- /* pointer to the DS configuration; goes into MSR_IA32_DS_AREA */
- unsigned char ds[MAX_SIZEOF_DS];
- /* the owner of the BTS and PEBS configuration, respectively */
- struct bts_tracer *bts_master;
- struct pebs_tracer *pebs_master;
- /* use count */
- unsigned long count;
- /* a pointer to the context location inside the thread_struct
- * or the per_cpu context array */
- struct ds_context **this;
- /* a pointer to the task owning this context, or NULL, if the
- * context is owned by a cpu */
- struct task_struct *task;
-};
+ /* The DS configuration; goes into MSR_IA32_DS_AREA: */
+ unsigned char ds[MAX_SIZEOF_DS];
+
+ /* The owner of the BTS and PEBS configuration, respectively: */
+ struct bts_tracer *bts_master;
+ struct pebs_tracer *pebs_master;
-static DEFINE_PER_CPU(struct ds_context *, system_context_array);
+ /* Use count: */
+ unsigned long count;
-#define system_context per_cpu(system_context_array, smp_processor_id())
+ /* Pointer to the context pointer field: */
+ struct ds_context **this;
+
+ /* The traced task; NULL for cpu tracing: */
+ struct task_struct *task;
+
+ /* The traced cpu; only valid if task is NULL: */
+ int cpu;
+};
+static DEFINE_PER_CPU(struct ds_context *, cpu_context);
-static inline struct ds_context *ds_get_context(struct task_struct *task)
+
+static struct ds_context *ds_get_context(struct task_struct *task, int cpu)
{
struct ds_context **p_context =
- (task ? &task->thread.ds_ctx : &system_context);
+ (task ? &task->thread.ds_ctx : &per_cpu(cpu_context, cpu));
struct ds_context *context = NULL;
struct ds_context *new_context = NULL;
- unsigned long irq;
/* Chances are small that we already have a context. */
new_context = kzalloc(sizeof(*new_context), GFP_KERNEL);
if (!new_context)
return NULL;
- spin_lock_irqsave(&ds_lock, irq);
+ spin_lock_irq(&ds_lock);
context = *p_context;
- if (!context) {
+ if (likely(!context)) {
context = new_context;
context->this = p_context;
context->task = task;
+ context->cpu = cpu;
context->count = 0;
- if (task)
- set_tsk_thread_flag(task, TIF_DS_AREA_MSR);
-
- if (!task || (task == current))
- wrmsrl(MSR_IA32_DS_AREA, (unsigned long)context->ds);
-
*p_context = context;
}
context->count++;
- spin_unlock_irqrestore(&ds_lock, irq);
+ spin_unlock_irq(&ds_lock);
if (context != new_context)
kfree(new_context);
@@ -275,8 +304,9 @@ static inline struct ds_context *ds_get_context(struct task_struct *task)
return context;
}
-static inline void ds_put_context(struct ds_context *context)
+static void ds_put_context(struct ds_context *context)
{
+ struct task_struct *task;
unsigned long irq;
if (!context)
@@ -291,17 +321,55 @@ static inline void ds_put_context(struct ds_context *context)
*(context->this) = NULL;
- if (context->task)
- clear_tsk_thread_flag(context->task, TIF_DS_AREA_MSR);
+ task = context->task;
+
+ if (task)
+ clear_tsk_thread_flag(task, TIF_DS_AREA_MSR);
- if (!context->task || (context->task == current))
- wrmsrl(MSR_IA32_DS_AREA, 0);
+ /*
+ * We leave the (now dangling) pointer to the DS configuration in
+ * the DS_AREA msr. This is as good or as bad as replacing it with
+ * NULL - the hardware would crash if we enabled tracing.
+ *
+ * This saves us some problems with having to write an msr on a
+ * different cpu while preventing others from doing the same for the
+ * next context for that same cpu.
+ */
spin_unlock_irqrestore(&ds_lock, irq);
+ /* The context might still be in use for context switching. */
+ if (task && (task != current))
+ wait_task_context_switch(task);
+
kfree(context);
}
+static void ds_install_ds_area(struct ds_context *context)
+{
+ unsigned long ds;
+
+ ds = (unsigned long)context->ds;
+
+ /*
+ * There is a race between the bts master and the pebs master.
+ *
+ * The thread/cpu access is synchronized via get/put_cpu() for
+ * task tracing and via wrmsr_on_cpu for cpu tracing.
+ *
+ * If bts and pebs are collected for the same task or same cpu,
+ * the same confiuration is written twice.
+ */
+ if (context->task) {
+ get_cpu();
+ if (context->task == current)
+ wrmsrl(MSR_IA32_DS_AREA, ds);
+ set_tsk_thread_flag(context->task, TIF_DS_AREA_MSR);
+ put_cpu();
+ } else
+ wrmsr_on_cpu(context->cpu, MSR_IA32_DS_AREA,
+ (u32)((u64)ds), (u32)((u64)ds >> 32));
+}
/*
* Call the tracer's callback on a buffer overflow.
@@ -332,9 +400,9 @@ static void ds_overflow(struct ds_context *context, enum ds_qualifier qual)
* The remainder of any partially written record is zeroed out.
*
* context: the DS context
- * qual: the buffer type
- * record: the data to write
- * size: the size of the data
+ * qual: the buffer type
+ * record: the data to write
+ * size: the size of the data
*/
static int ds_write(struct ds_context *context, enum ds_qualifier qual,
const void *record, size_t size)
@@ -349,14 +417,14 @@ static int ds_write(struct ds_context *context, enum ds_qualifier qual,
unsigned long write_size, adj_write_size;
/*
- * write as much as possible without producing an
+ * Write as much as possible without producing an
* overflow interrupt.
*
- * interrupt_threshold must either be
+ * Interrupt_threshold must either be
* - bigger than absolute_maximum or
* - point to a record between buffer_base and absolute_maximum
*
- * index points to a valid record.
+ * Index points to a valid record.
*/
base = ds_get(context->ds, qual, ds_buffer_base);
index = ds_get(context->ds, qual, ds_index);
@@ -365,8 +433,10 @@ static int ds_write(struct ds_context *context, enum ds_qualifier qual,
write_end = min(end, int_th);
- /* if we are already beyond the interrupt threshold,
- * we fill the entire buffer */
+ /*
+ * If we are already beyond the interrupt threshold,
+ * we fill the entire buffer.
+ */
if (write_end <= index)
write_end = end;
@@ -383,7 +453,7 @@ static int ds_write(struct ds_context *context, enum ds_qualifier qual,
adj_write_size = write_size / ds_cfg.sizeof_rec[qual];
adj_write_size *= ds_cfg.sizeof_rec[qual];
- /* zero out trailing bytes */
+ /* Zero out trailing bytes. */
memset((char *)index + write_size, 0,
adj_write_size - write_size);
index += adj_write_size;
@@ -410,7 +480,7 @@ static int ds_write(struct ds_context *context, enum ds_qualifier qual,
* Later architectures use 64bit pointers throughout, whereas earlier
* architectures use 32bit pointers in 32bit mode.
*
- * We compute the base address for the first 8 fields based on:
+ * We compute the base address for the fields based on:
* - the field size stored in the DS configuration
* - the relative field position
*
@@ -431,23 +501,23 @@ enum bts_field {
bts_to,
bts_flags,
- bts_qual = bts_from,
- bts_jiffies = bts_to,
- bts_pid = bts_flags,
+ bts_qual = bts_from,
+ bts_clock = bts_to,
+ bts_pid = bts_flags,
- bts_qual_mask = (bts_qual_max - 1),
- bts_escape = ((unsigned long)-1 & ~bts_qual_mask)
+ bts_qual_mask = (bts_qual_max - 1),
+ bts_escape = ((unsigned long)-1 & ~bts_qual_mask)
};
static inline unsigned long bts_get(const char *base, enum bts_field field)
{
- base += (ds_cfg.sizeof_field * field);
+ base += (ds_cfg.sizeof_ptr_field * field);
return *(unsigned long *)base;
}
static inline void bts_set(char *base, enum bts_field field, unsigned long val)
{
- base += (ds_cfg.sizeof_field * field);;
+ base += (ds_cfg.sizeof_ptr_field * field);;
(*(unsigned long *)base) = val;
}
@@ -463,8 +533,8 @@ static inline void bts_set(char *base, enum bts_field field, unsigned long val)
*
* return: bytes read/written on success; -Eerrno, otherwise
*/
-static int bts_read(struct bts_tracer *tracer, const void *at,
- struct bts_struct *out)
+static int
+bts_read(struct bts_tracer *tracer, const void *at, struct bts_struct *out)
{
if (!tracer)
return -EINVAL;
@@ -478,8 +548,8 @@ static int bts_read(struct bts_tracer *tracer, const void *at,
memset(out, 0, sizeof(*out));
if ((bts_get(at, bts_qual) & ~bts_qual_mask) == bts_escape) {
out->qualifier = (bts_get(at, bts_qual) & bts_qual_mask);
- out->variant.timestamp.jiffies = bts_get(at, bts_jiffies);
- out->variant.timestamp.pid = bts_get(at, bts_pid);
+ out->variant.event.clock = bts_get(at, bts_clock);
+ out->variant.event.pid = bts_get(at, bts_pid);
} else {
out->qualifier = bts_branch;
out->variant.lbr.from = bts_get(at, bts_from);
@@ -516,8 +586,8 @@ static int bts_write(struct bts_tracer *tracer, const struct bts_struct *in)
case bts_task_arrives:
case bts_task_departs:
bts_set(raw, bts_qual, (bts_escape | in->qualifier));
- bts_set(raw, bts_jiffies, in->variant.timestamp.jiffies);
- bts_set(raw, bts_pid, in->variant.timestamp.pid);
+ bts_set(raw, bts_clock, in->variant.event.clock);
+ bts_set(raw, bts_pid, in->variant.event.pid);
break;
default:
return -EINVAL;
@@ -555,7 +625,8 @@ static void ds_init_ds_trace(struct ds_trace *trace, enum ds_qualifier qual,
unsigned int flags) {
unsigned long buffer, adj;
- /* adjust the buffer address and size to meet alignment
+ /*
+ * Adjust the buffer address and size to meet alignment
* constraints:
* - buffer is double-word aligned
* - size is multiple of record size
@@ -577,9 +648,11 @@ static void ds_init_ds_trace(struct ds_trace *trace, enum ds_qualifier qual,
trace->begin = (void *)buffer;
trace->top = trace->begin;
trace->end = (void *)(buffer + size);
- /* The value for 'no threshold' is -1, which will set the
+ /*
+ * The value for 'no threshold' is -1, which will set the
* threshold outside of the buffer, just like we want it.
*/
+ ith *= ds_cfg.sizeof_rec[qual];
trace->ith = (void *)(buffer + size - ith);
trace->flags = flags;
@@ -588,18 +661,27 @@ static void ds_init_ds_trace(struct ds_trace *trace, enum ds_qualifier qual,
static int ds_request(struct ds_tracer *tracer, struct ds_trace *trace,
enum ds_qualifier qual, struct task_struct *task,
- void *base, size_t size, size_t th, unsigned int flags)
+ int cpu, void *base, size_t size, size_t th)
{
struct ds_context *context;
int error;
+ size_t req_size;
+
+ error = -EOPNOTSUPP;
+ if (!ds_cfg.sizeof_rec[qual])
+ goto out;
error = -EINVAL;
if (!base)
goto out;
- /* we require some space to do alignment adjustments below */
+ req_size = ds_cfg.sizeof_rec[qual];
+ /* We might need space for alignment adjustments. */
+ if (!IS_ALIGNED((unsigned long)base, DS_ALIGNMENT))
+ req_size += DS_ALIGNMENT;
+
error = -EINVAL;
- if (size < (DS_ALIGNMENT + ds_cfg.sizeof_rec[qual]))
+ if (size < req_size)
goto out;
if (th != (size_t)-1) {
@@ -614,182 +696,318 @@ static int ds_request(struct ds_tracer *tracer, struct ds_trace *trace,
tracer->size = size;
error = -ENOMEM;
- context = ds_get_context(task);
+ context = ds_get_context(task, cpu);
if (!context)
goto out;
tracer->context = context;
- ds_init_ds_trace(trace, qual, base, size, th, flags);
+ /*
+ * Defer any tracer-specific initialization work for the context until
+ * context ownership has been clarified.
+ */
error = 0;
out:
return error;
}
-struct bts_tracer *ds_request_bts(struct task_struct *task,
- void *base, size_t size,
- bts_ovfl_callback_t ovfl, size_t th,
- unsigned int flags)
+static struct bts_tracer *ds_request_bts(struct task_struct *task, int cpu,
+ void *base, size_t size,
+ bts_ovfl_callback_t ovfl, size_t th,
+ unsigned int flags)
{
struct bts_tracer *tracer;
- unsigned long irq;
int error;
+ /* Buffer overflow notification is not yet implemented. */
error = -EOPNOTSUPP;
- if (!ds_cfg.ctl[dsf_bts])
+ if (ovfl)
goto out;
- /* buffer overflow notification is not yet implemented */
- error = -EOPNOTSUPP;
- if (ovfl)
+ error = get_tracer(task);
+ if (error < 0)
goto out;
error = -ENOMEM;
tracer = kzalloc(sizeof(*tracer), GFP_KERNEL);
if (!tracer)
- goto out;
+ goto out_put_tracer;
tracer->ovfl = ovfl;
+ /* Do some more error checking and acquire a tracing context. */
error = ds_request(&tracer->ds, &tracer->trace.ds,
- ds_bts, task, base, size, th, flags);
+ ds_bts, task, cpu, base, size, th);
if (error < 0)
goto out_tracer;
-
- spin_lock_irqsave(&ds_lock, irq);
-
- error = -EPERM;
- if (!check_tracer(task))
- goto out_unlock;
- get_tracer(task);
+ /* Claim the bts part of the tracing context we acquired above. */
+ spin_lock_irq(&ds_lock);
error = -EPERM;
if (tracer->ds.context->bts_master)
- goto out_put_tracer;
+ goto out_unlock;
tracer->ds.context->bts_master = tracer;
- spin_unlock_irqrestore(&ds_lock, irq);
+ spin_unlock_irq(&ds_lock);
+ /*
+ * Now that we own the bts part of the context, let's complete the
+ * initialization for that part.
+ */
+ ds_init_ds_trace(&tracer->trace.ds, ds_bts, base, size, th, flags);
+ ds_write_config(tracer->ds.context, &tracer->trace.ds, ds_bts);
+ ds_install_ds_area(tracer->ds.context);
tracer->trace.read = bts_read;
tracer->trace.write = bts_write;
- ds_write_config(tracer->ds.context, &tracer->trace.ds, ds_bts);
+ /* Start tracing. */
ds_resume_bts(tracer);
return tracer;
- out_put_tracer:
- put_tracer(task);
out_unlock:
- spin_unlock_irqrestore(&ds_lock, irq);
+ spin_unlock_irq(&ds_lock);
ds_put_context(tracer->ds.context);
out_tracer:
kfree(tracer);
+ out_put_tracer:
+ put_tracer(task);
out:
return ERR_PTR(error);
}
-struct pebs_tracer *ds_request_pebs(struct task_struct *task,
- void *base, size_t size,
- pebs_ovfl_callback_t ovfl, size_t th,
- unsigned int flags)
+struct bts_tracer *ds_request_bts_task(struct task_struct *task,
+ void *base, size_t size,
+ bts_ovfl_callback_t ovfl,
+ size_t th, unsigned int flags)
+{
+ return ds_request_bts(task, 0, base, size, ovfl, th, flags);
+}
+
+struct bts_tracer *ds_request_bts_cpu(int cpu, void *base, size_t size,
+ bts_ovfl_callback_t ovfl,
+ size_t th, unsigned int flags)
+{
+ return ds_request_bts(NULL, cpu, base, size, ovfl, th, flags);
+}
+
+static struct pebs_tracer *ds_request_pebs(struct task_struct *task, int cpu,
+ void *base, size_t size,
+ pebs_ovfl_callback_t ovfl, size_t th,
+ unsigned int flags)
{
struct pebs_tracer *tracer;
- unsigned long irq;
int error;
- /* buffer overflow notification is not yet implemented */
+ /* Buffer overflow notification is not yet implemented. */
error = -EOPNOTSUPP;
if (ovfl)
goto out;
+ error = get_tracer(task);
+ if (error < 0)
+ goto out;
+
error = -ENOMEM;
tracer = kzalloc(sizeof(*tracer), GFP_KERNEL);
if (!tracer)
- goto out;
+ goto out_put_tracer;
tracer->ovfl = ovfl;
+ /* Do some more error checking and acquire a tracing context. */
error = ds_request(&tracer->ds, &tracer->trace.ds,
- ds_pebs, task, base, size, th, flags);
+ ds_pebs, task, cpu, base, size, th);
if (error < 0)
goto out_tracer;
- spin_lock_irqsave(&ds_lock, irq);
-
- error = -EPERM;
- if (!check_tracer(task))
- goto out_unlock;
- get_tracer(task);
+ /* Claim the pebs part of the tracing context we acquired above. */
+ spin_lock_irq(&ds_lock);
error = -EPERM;
if (tracer->ds.context->pebs_master)
- goto out_put_tracer;
+ goto out_unlock;
tracer->ds.context->pebs_master = tracer;
- spin_unlock_irqrestore(&ds_lock, irq);
+ spin_unlock_irq(&ds_lock);
+ /*
+ * Now that we own the pebs part of the context, let's complete the
+ * initialization for that part.
+ */
+ ds_init_ds_trace(&tracer->trace.ds, ds_pebs, base, size, th, flags);
ds_write_config(tracer->ds.context, &tracer->trace.ds, ds_pebs);
+ ds_install_ds_area(tracer->ds.context);
+
+ /* Start tracing. */
ds_resume_pebs(tracer);
return tracer;
- out_put_tracer:
- put_tracer(task);
out_unlock:
- spin_unlock_irqrestore(&ds_lock, irq);
+ spin_unlock_irq(&ds_lock);
ds_put_context(tracer->ds.context);
out_tracer:
kfree(tracer);
+ out_put_tracer:
+ put_tracer(task);
out:
return ERR_PTR(error);
}
-void ds_release_bts(struct bts_tracer *tracer)
+struct pebs_tracer *ds_request_pebs_task(struct task_struct *task,
+ void *base, size_t size,
+ pebs_ovfl_callback_t ovfl,
+ size_t th, unsigned int flags)
{
- if (!tracer)
- return;
+ return ds_request_pebs(task, 0, base, size, ovfl, th, flags);
+}
- ds_suspend_bts(tracer);
+struct pebs_tracer *ds_request_pebs_cpu(int cpu, void *base, size_t size,
+ pebs_ovfl_callback_t ovfl,
+ size_t th, unsigned int flags)
+{
+ return ds_request_pebs(NULL, cpu, base, size, ovfl, th, flags);
+}
+
+static void ds_free_bts(struct bts_tracer *tracer)
+{
+ struct task_struct *task;
+
+ task = tracer->ds.context->task;
WARN_ON_ONCE(tracer->ds.context->bts_master != tracer);
tracer->ds.context->bts_master = NULL;
- put_tracer(tracer->ds.context->task);
+ /* Make sure tracing stopped and the tracer is not in use. */
+ if (task && (task != current))
+ wait_task_context_switch(task);
+
ds_put_context(tracer->ds.context);
+ put_tracer(task);
kfree(tracer);
}
+void ds_release_bts(struct bts_tracer *tracer)
+{
+ might_sleep();
+
+ if (!tracer)
+ return;
+
+ ds_suspend_bts(tracer);
+ ds_free_bts(tracer);
+}
+
+int ds_release_bts_noirq(struct bts_tracer *tracer)
+{
+ struct task_struct *task;
+ unsigned long irq;
+ int error;
+
+ if (!tracer)
+ return 0;
+
+ task = tracer->ds.context->task;
+
+ local_irq_save(irq);
+
+ error = -EPERM;
+ if (!task &&
+ (tracer->ds.context->cpu != smp_processor_id()))
+ goto out;
+
+ error = -EPERM;
+ if (task && (task != current))
+ goto out;
+
+ ds_suspend_bts_noirq(tracer);
+ ds_free_bts(tracer);
+
+ error = 0;
+ out:
+ local_irq_restore(irq);
+ return error;
+}
+
+static void update_task_debugctlmsr(struct task_struct *task,
+ unsigned long debugctlmsr)
+{
+ task->thread.debugctlmsr = debugctlmsr;
+
+ get_cpu();
+ if (task == current)
+ update_debugctlmsr(debugctlmsr);
+ put_cpu();
+}
+
void ds_suspend_bts(struct bts_tracer *tracer)
{
struct task_struct *task;
+ unsigned long debugctlmsr;
+ int cpu;
if (!tracer)
return;
+ tracer->flags = 0;
+
task = tracer->ds.context->task;
+ cpu = tracer->ds.context->cpu;
- if (!task || (task == current))
- update_debugctlmsr(get_debugctlmsr() & ~BTS_CONTROL);
+ WARN_ON(!task && irqs_disabled());
- if (task) {
- task->thread.debugctlmsr &= ~BTS_CONTROL;
+ debugctlmsr = (task ?
+ task->thread.debugctlmsr :
+ get_debugctlmsr_on_cpu(cpu));
+ debugctlmsr &= ~BTS_CONTROL;
- if (!task->thread.debugctlmsr)
- clear_tsk_thread_flag(task, TIF_DEBUGCTLMSR);
- }
+ if (task)
+ update_task_debugctlmsr(task, debugctlmsr);
+ else
+ update_debugctlmsr_on_cpu(cpu, debugctlmsr);
}
-void ds_resume_bts(struct bts_tracer *tracer)
+int ds_suspend_bts_noirq(struct bts_tracer *tracer)
{
struct task_struct *task;
- unsigned long control;
+ unsigned long debugctlmsr, irq;
+ int cpu, error = 0;
if (!tracer)
- return;
+ return 0;
+
+ tracer->flags = 0;
task = tracer->ds.context->task;
+ cpu = tracer->ds.context->cpu;
+
+ local_irq_save(irq);
+
+ error = -EPERM;
+ if (!task && (cpu != smp_processor_id()))
+ goto out;
+
+ debugctlmsr = (task ?
+ task->thread.debugctlmsr :
+ get_debugctlmsr());
+ debugctlmsr &= ~BTS_CONTROL;
+
+ if (task)
+ update_task_debugctlmsr(task, debugctlmsr);
+ else
+ update_debugctlmsr(debugctlmsr);
+
+ error = 0;
+ out:
+ local_irq_restore(irq);
+ return error;
+}
+
+static unsigned long ds_bts_control(struct bts_tracer *tracer)
+{
+ unsigned long control;
control = ds_cfg.ctl[dsf_bts];
if (!(tracer->trace.ds.flags & BTS_KERNEL))
@@ -797,41 +1015,149 @@ void ds_resume_bts(struct bts_tracer *tracer)
if (!(tracer->trace.ds.flags & BTS_USER))
control |= ds_cfg.ctl[dsf_bts_user];
- if (task) {
- task->thread.debugctlmsr |= control;
- set_tsk_thread_flag(task, TIF_DEBUGCTLMSR);
- }
-
- if (!task || (task == current))
- update_debugctlmsr(get_debugctlmsr() | control);
+ return control;
}
-void ds_release_pebs(struct pebs_tracer *tracer)
+void ds_resume_bts(struct bts_tracer *tracer)
{
+ struct task_struct *task;
+ unsigned long debugctlmsr;
+ int cpu;
+
if (!tracer)
return;
- ds_suspend_pebs(tracer);
+ tracer->flags = tracer->trace.ds.flags;
+
+ task = tracer->ds.context->task;
+ cpu = tracer->ds.context->cpu;
+
+ WARN_ON(!task && irqs_disabled());
+
+ debugctlmsr = (task ?
+ task->thread.debugctlmsr :
+ get_debugctlmsr_on_cpu(cpu));
+ debugctlmsr |= ds_bts_control(tracer);
+
+ if (task)
+ update_task_debugctlmsr(task, debugctlmsr);
+ else
+ update_debugctlmsr_on_cpu(cpu, debugctlmsr);
+}
+
+int ds_resume_bts_noirq(struct bts_tracer *tracer)
+{
+ struct task_struct *task;
+ unsigned long debugctlmsr, irq;
+ int cpu, error = 0;
+
+ if (!tracer)
+ return 0;
+
+ tracer->flags = tracer->trace.ds.flags;
+
+ task = tracer->ds.context->task;
+ cpu = tracer->ds.context->cpu;
+
+ local_irq_save(irq);
+
+ error = -EPERM;
+ if (!task && (cpu != smp_processor_id()))
+ goto out;
+
+ debugctlmsr = (task ?
+ task->thread.debugctlmsr :
+ get_debugctlmsr());
+ debugctlmsr |= ds_bts_control(tracer);
+
+ if (task)
+ update_task_debugctlmsr(task, debugctlmsr);
+ else
+ update_debugctlmsr(debugctlmsr);
+
+ error = 0;
+ out:
+ local_irq_restore(irq);
+ return error;
+}
+
+static void ds_free_pebs(struct pebs_tracer *tracer)
+{
+ struct task_struct *task;
+
+ task = tracer->ds.context->task;
WARN_ON_ONCE(tracer->ds.context->pebs_master != tracer);
tracer->ds.context->pebs_master = NULL;
- put_tracer(tracer->ds.context->task);
ds_put_context(tracer->ds.context);
+ put_tracer(task);
kfree(tracer);
}
+void ds_release_pebs(struct pebs_tracer *tracer)
+{
+ might_sleep();
+
+ if (!tracer)
+ return;
+
+ ds_suspend_pebs(tracer);
+ ds_free_pebs(tracer);
+}
+
+int ds_release_pebs_noirq(struct pebs_tracer *tracer)
+{
+ struct task_struct *task;
+ unsigned long irq;
+ int error;
+
+ if (!tracer)
+ return 0;
+
+ task = tracer->ds.context->task;
+
+ local_irq_save(irq);
+
+ error = -EPERM;
+ if (!task &&
+ (tracer->ds.context->cpu != smp_processor_id()))
+ goto out;
+
+ error = -EPERM;
+ if (task && (task != current))
+ goto out;
+
+ ds_suspend_pebs_noirq(tracer);
+ ds_free_pebs(tracer);
+
+ error = 0;
+ out:
+ local_irq_restore(irq);
+ return error;
+}
+
void ds_suspend_pebs(struct pebs_tracer *tracer)
{
}
+int ds_suspend_pebs_noirq(struct pebs_tracer *tracer)
+{
+ return 0;
+}
+
void ds_resume_pebs(struct pebs_tracer *tracer)
{
}
+int ds_resume_pebs_noirq(struct pebs_tracer *tracer)
+{
+ return 0;
+}
+
const struct bts_trace *ds_read_bts(struct bts_tracer *tracer)
{
if (!tracer)
@@ -847,8 +1173,12 @@ const struct pebs_trace *ds_read_pebs(struct pebs_tracer *tracer)
return NULL;
ds_read_config(tracer->ds.context, &tracer->trace.ds, ds_pebs);
- tracer->trace.reset_value =
- *(u64 *)(tracer->ds.context->ds + (ds_cfg.sizeof_field * 8));
+
+ tracer->trace.counters = ds_cfg.nr_counter_reset;
+ memcpy(tracer->trace.counter_reset,
+ tracer->ds.context->ds +
+ (NUM_DS_PTR_FIELDS * ds_cfg.sizeof_ptr_field),
+ ds_cfg.nr_counter_reset * PEBS_RESET_FIELD_SIZE);
return &tracer->trace;
}
@@ -873,18 +1203,24 @@ int ds_reset_pebs(struct pebs_tracer *tracer)
tracer->trace.ds.top = tracer->trace.ds.begin;
- ds_set(tracer->ds.context->ds, ds_bts, ds_index,
+ ds_set(tracer->ds.context->ds, ds_pebs, ds_index,
(unsigned long)tracer->trace.ds.top);
return 0;
}
-int ds_set_pebs_reset(struct pebs_tracer *tracer, u64 value)
+int ds_set_pebs_reset(struct pebs_tracer *tracer,
+ unsigned int counter, u64 value)
{
if (!tracer)
return -EINVAL;
- *(u64 *)(tracer->ds.context->ds + (ds_cfg.sizeof_field * 8)) = value;
+ if (ds_cfg.nr_counter_reset < counter)
+ return -EINVAL;
+
+ *(u64 *)(tracer->ds.context->ds +
+ (NUM_DS_PTR_FIELDS * ds_cfg.sizeof_ptr_field) +
+ (counter * PEBS_RESET_FIELD_SIZE)) = value;
return 0;
}
@@ -894,73 +1230,117 @@ static const struct ds_configuration ds_cfg_netburst = {
.ctl[dsf_bts] = (1 << 2) | (1 << 3),
.ctl[dsf_bts_kernel] = (1 << 5),
.ctl[dsf_bts_user] = (1 << 6),
-
- .sizeof_field = sizeof(long),
- .sizeof_rec[ds_bts] = sizeof(long) * 3,
-#ifdef __i386__
- .sizeof_rec[ds_pebs] = sizeof(long) * 10,
-#else
- .sizeof_rec[ds_pebs] = sizeof(long) * 18,
-#endif
+ .nr_counter_reset = 1,
};
static const struct ds_configuration ds_cfg_pentium_m = {
.name = "Pentium M",
.ctl[dsf_bts] = (1 << 6) | (1 << 7),
-
- .sizeof_field = sizeof(long),
- .sizeof_rec[ds_bts] = sizeof(long) * 3,
-#ifdef __i386__
- .sizeof_rec[ds_pebs] = sizeof(long) * 10,
-#else
- .sizeof_rec[ds_pebs] = sizeof(long) * 18,
-#endif
+ .nr_counter_reset = 1,
};
static const struct ds_configuration ds_cfg_core2_atom = {
.name = "Core 2/Atom",
.ctl[dsf_bts] = (1 << 6) | (1 << 7),
.ctl[dsf_bts_kernel] = (1 << 9),
.ctl[dsf_bts_user] = (1 << 10),
-
- .sizeof_field = 8,
- .sizeof_rec[ds_bts] = 8 * 3,
- .sizeof_rec[ds_pebs] = 8 * 18,
+ .nr_counter_reset = 1,
+};
+static const struct ds_configuration ds_cfg_core_i7 = {
+ .name = "Core i7",
+ .ctl[dsf_bts] = (1 << 6) | (1 << 7),
+ .ctl[dsf_bts_kernel] = (1 << 9),
+ .ctl[dsf_bts_user] = (1 << 10),
+ .nr_counter_reset = 4,
};
static void
-ds_configure(const struct ds_configuration *cfg)
+ds_configure(const struct ds_configuration *cfg,
+ struct cpuinfo_x86 *cpu)
{
+ unsigned long nr_pebs_fields = 0;
+
+ printk(KERN_INFO "[ds] using %s configuration\n", cfg->name);
+
+#ifdef __i386__
+ nr_pebs_fields = 10;
+#else
+ nr_pebs_fields = 18;
+#endif
+
+ /*
+ * Starting with version 2, architectural performance
+ * monitoring supports a format specifier.
+ */
+ if ((cpuid_eax(0xa) & 0xff) > 1) {
+ unsigned long perf_capabilities, format;
+
+ rdmsrl(MSR_IA32_PERF_CAPABILITIES, perf_capabilities);
+
+ format = (perf_capabilities >> 8) & 0xf;
+
+ switch (format) {
+ case 0:
+ nr_pebs_fields = 18;
+ break;
+ case 1:
+ nr_pebs_fields = 22;
+ break;
+ default:
+ printk(KERN_INFO
+ "[ds] unknown PEBS format: %lu\n", format);
+ nr_pebs_fields = 0;
+ break;
+ }
+ }
+
memset(&ds_cfg, 0, sizeof(ds_cfg));
ds_cfg = *cfg;
- printk(KERN_INFO "[ds] using %s configuration\n", ds_cfg.name);
+ ds_cfg.sizeof_ptr_field =
+ (cpu_has(cpu, X86_FEATURE_DTES64) ? 8 : 4);
+
+ ds_cfg.sizeof_rec[ds_bts] = ds_cfg.sizeof_ptr_field * 3;
+ ds_cfg.sizeof_rec[ds_pebs] = ds_cfg.sizeof_ptr_field * nr_pebs_fields;
- if (!cpu_has_bts) {
- ds_cfg.ctl[dsf_bts] = 0;
+ if (!cpu_has(cpu, X86_FEATURE_BTS)) {
+ ds_cfg.sizeof_rec[ds_bts] = 0;
printk(KERN_INFO "[ds] bts not available\n");
}
- if (!cpu_has_pebs)
+ if (!cpu_has(cpu, X86_FEATURE_PEBS)) {
+ ds_cfg.sizeof_rec[ds_pebs] = 0;
printk(KERN_INFO "[ds] pebs not available\n");
+ }
+
+ printk(KERN_INFO "[ds] sizes: address: %u bit, ",
+ 8 * ds_cfg.sizeof_ptr_field);
+ printk("bts/pebs record: %u/%u bytes\n",
+ ds_cfg.sizeof_rec[ds_bts], ds_cfg.sizeof_rec[ds_pebs]);
- WARN_ON_ONCE(MAX_SIZEOF_DS < (12 * ds_cfg.sizeof_field));
+ WARN_ON_ONCE(MAX_PEBS_COUNTERS < ds_cfg.nr_counter_reset);
}
void __cpuinit ds_init_intel(struct cpuinfo_x86 *c)
{
+ /* Only configure the first cpu. Others are identical. */
+ if (ds_cfg.name)
+ return;
+
switch (c->x86) {
case 0x6:
switch (c->x86_model) {
case 0x9:
case 0xd: /* Pentium M */
- ds_configure(&ds_cfg_pentium_m);
+ ds_configure(&ds_cfg_pentium_m, c);
break;
case 0xf:
case 0x17: /* Core2 */
case 0x1c: /* Atom */
- ds_configure(&ds_cfg_core2_atom);
+ ds_configure(&ds_cfg_core2_atom, c);
+ break;
+ case 0x1a: /* Core i7 */
+ ds_configure(&ds_cfg_core_i7, c);
break;
- case 0x1a: /* i7 */
default:
- /* sorry, don't know about them */
+ /* Sorry, don't know about them. */
break;
}
break;
@@ -969,64 +1349,89 @@ void __cpuinit ds_init_intel(struct cpuinfo_x86 *c)
case 0x0:
case 0x1:
case 0x2: /* Netburst */
- ds_configure(&ds_cfg_netburst);
+ ds_configure(&ds_cfg_netburst, c);
break;
default:
- /* sorry, don't know about them */
+ /* Sorry, don't know about them. */
break;
}
break;
default:
- /* sorry, don't know about them */
+ /* Sorry, don't know about them. */
break;
}
}
+static inline void ds_take_timestamp(struct ds_context *context,
+ enum bts_qualifier qualifier,
+ struct task_struct *task)
+{
+ struct bts_tracer *tracer = context->bts_master;
+ struct bts_struct ts;
+
+ /* Prevent compilers from reading the tracer pointer twice. */
+ barrier();
+
+ if (!tracer || !(tracer->flags & BTS_TIMESTAMPS))
+ return;
+
+ memset(&ts, 0, sizeof(ts));
+ ts.qualifier = qualifier;
+ ts.variant.event.clock = trace_clock_global();
+ ts.variant.event.pid = task->pid;
+
+ bts_write(tracer, &ts);
+}
+
/*
* Change the DS configuration from tracing prev to tracing next.
*/
void ds_switch_to(struct task_struct *prev, struct task_struct *next)
{
- struct ds_context *prev_ctx = prev->thread.ds_ctx;
- struct ds_context *next_ctx = next->thread.ds_ctx;
+ struct ds_context *prev_ctx = prev->thread.ds_ctx;
+ struct ds_context *next_ctx = next->thread.ds_ctx;
+ unsigned long debugctlmsr = next->thread.debugctlmsr;
+
+ /* Make sure all data is read before we start. */
+ barrier();
if (prev_ctx) {
update_debugctlmsr(0);
- if (prev_ctx->bts_master &&
- (prev_ctx->bts_master->trace.ds.flags & BTS_TIMESTAMPS)) {
- struct bts_struct ts = {
- .qualifier = bts_task_departs,
- .variant.timestamp.jiffies = jiffies_64,
- .variant.timestamp.pid = prev->pid
- };
- bts_write(prev_ctx->bts_master, &ts);
- }
+ ds_take_timestamp(prev_ctx, bts_task_departs, prev);
}
if (next_ctx) {
- if (next_ctx->bts_master &&
- (next_ctx->bts_master->trace.ds.flags & BTS_TIMESTAMPS)) {
- struct bts_struct ts = {
- .qualifier = bts_task_arrives,
- .variant.timestamp.jiffies = jiffies_64,
- .variant.timestamp.pid = next->pid
- };
- bts_write(next_ctx->bts_master, &ts);
- }
+ ds_take_timestamp(next_ctx, bts_task_arrives, next);
wrmsrl(MSR_IA32_DS_AREA, (unsigned long)next_ctx->ds);
}
- update_debugctlmsr(next->thread.debugctlmsr);
+ update_debugctlmsr(debugctlmsr);
}
-void ds_copy_thread(struct task_struct *tsk, struct task_struct *father)
+static __init int ds_selftest(void)
{
- clear_tsk_thread_flag(tsk, TIF_DS_AREA_MSR);
- tsk->thread.ds_ctx = NULL;
-}
+ if (ds_cfg.sizeof_rec[ds_bts]) {
+ int error;
-void ds_exit_thread(struct task_struct *tsk)
-{
+ error = ds_selftest_bts();
+ if (error) {
+ WARN(1, "[ds] selftest failed. disabling bts.\n");
+ ds_cfg.sizeof_rec[ds_bts] = 0;
+ }
+ }
+
+ if (ds_cfg.sizeof_rec[ds_pebs]) {
+ int error;
+
+ error = ds_selftest_pebs();
+ if (error) {
+ WARN(1, "[ds] selftest failed. disabling pebs.\n");
+ ds_cfg.sizeof_rec[ds_pebs] = 0;
+ }
+ }
+
+ return 0;
}
+device_initcall(ds_selftest);
diff --git a/arch/x86/kernel/ds_selftest.c b/arch/x86/kernel/ds_selftest.c
new file mode 100644
index 0000000..6bc7c19
--- /dev/null
+++ b/arch/x86/kernel/ds_selftest.c
@@ -0,0 +1,408 @@
+/*
+ * Debug Store support - selftest
+ *
+ *
+ * Copyright (C) 2009 Intel Corporation.
+ * Markus Metzger <markus.t.metzger@...el.com>, 2009
+ */
+
+#include "ds_selftest.h"
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/smp.h>
+#include <linux/cpu.h>
+
+#include <asm/ds.h>
+
+
+#define BUFFER_SIZE 521 /* Intentionally chose an odd size. */
+#define SMALL_BUFFER_SIZE 24 /* A single bts entry. */
+
+struct ds_selftest_bts_conf {
+ struct bts_tracer *tracer;
+ int error;
+ int (*suspend)(struct bts_tracer *);
+ int (*resume)(struct bts_tracer *);
+};
+
+static int ds_selftest_bts_consistency(const struct bts_trace *trace)
+{
+ int error = 0;
+
+ if (!trace) {
+ printk(KERN_CONT "failed to access trace...");
+ /* Bail out. Other tests are pointless. */
+ return -1;
+ }
+
+ if (!trace->read) {
+ printk(KERN_CONT "bts read not available...");
+ error = -1;
+ }
+
+ /* Do some sanity checks on the trace configuration. */
+ if (!trace->ds.n) {
+ printk(KERN_CONT "empty bts buffer...");
+ error = -1;
+ }
+ if (!trace->ds.size) {
+ printk(KERN_CONT "bad bts trace setup...");
+ error = -1;
+ }
+ if (trace->ds.end !=
+ (char *)trace->ds.begin + (trace->ds.n * trace->ds.size)) {
+ printk(KERN_CONT "bad bts buffer setup...");
+ error = -1;
+ }
+ /*
+ * We allow top in [begin; end], since its not clear when the
+ * overflow adjustment happens: after the increment or before the
+ * write.
+ */
+ if ((trace->ds.top < trace->ds.begin) ||
+ (trace->ds.end < trace->ds.top)) {
+ printk(KERN_CONT "bts top out of bounds...");
+ error = -1;
+ }
+
+ return error;
+}
+
+static int ds_selftest_bts_read(struct bts_tracer *tracer,
+ const struct bts_trace *trace,
+ const void *from, const void *to)
+{
+ const unsigned char *at;
+
+ /*
+ * Check a few things which do not belong to this test.
+ * They should be covered by other tests.
+ */
+ if (!trace)
+ return -1;
+
+ if (!trace->read)
+ return -1;
+
+ if (to < from)
+ return -1;
+
+ if (from < trace->ds.begin)
+ return -1;
+
+ if (trace->ds.end < to)
+ return -1;
+
+ if (!trace->ds.size)
+ return -1;
+
+ /* Now to the test itself. */
+ for (at = from; (void *)at < to; at += trace->ds.size) {
+ struct bts_struct bts;
+ unsigned long index;
+ int error;
+
+ if (((void *)at - trace->ds.begin) % trace->ds.size) {
+ printk(KERN_CONT
+ "read from non-integer index...");
+ return -1;
+ }
+ index = ((void *)at - trace->ds.begin) / trace->ds.size;
+
+ memset(&bts, 0, sizeof(bts));
+ error = trace->read(tracer, at, &bts);
+ if (error < 0) {
+ printk(KERN_CONT
+ "error reading bts trace at [%lu] (0x%p)...",
+ index, at);
+ return error;
+ }
+
+ switch (bts.qualifier) {
+ case BTS_BRANCH:
+ break;
+ default:
+ printk(KERN_CONT
+ "unexpected bts entry %llu at [%lu] (0x%p)...",
+ bts.qualifier, index, at);
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+static void ds_selftest_bts_cpu(void *arg)
+{
+ struct ds_selftest_bts_conf *conf = arg;
+ const struct bts_trace *trace;
+ void *top;
+
+ if (IS_ERR(conf->tracer)) {
+ conf->error = PTR_ERR(conf->tracer);
+ conf->tracer = NULL;
+
+ printk(KERN_CONT
+ "initialization failed (err: %d)...", conf->error);
+ return;
+ }
+
+ /* We should meanwhile have enough trace. */
+ conf->error = conf->suspend(conf->tracer);
+ if (conf->error < 0)
+ return;
+
+ /* Let's see if we can access the trace. */
+ trace = ds_read_bts(conf->tracer);
+
+ conf->error = ds_selftest_bts_consistency(trace);
+ if (conf->error < 0)
+ return;
+
+ /* If everything went well, we should have a few trace entries. */
+ if (trace->ds.top == trace->ds.begin) {
+ /*
+ * It is possible but highly unlikely that we got a
+ * buffer overflow and end up at exactly the same
+ * position we started from.
+ * Let's issue a warning, but continue.
+ */
+ printk(KERN_CONT "no trace/overflow...");
+ }
+
+ /* Let's try to read the trace we collected. */
+ conf->error =
+ ds_selftest_bts_read(conf->tracer, trace,
+ trace->ds.begin, trace->ds.top);
+ if (conf->error < 0)
+ return;
+
+ /*
+ * Let's read the trace again.
+ * Since we suspended tracing, we should get the same result.
+ */
+ top = trace->ds.top;
+
+ trace = ds_read_bts(conf->tracer);
+ conf->error = ds_selftest_bts_consistency(trace);
+ if (conf->error < 0)
+ return;
+
+ if (top != trace->ds.top) {
+ printk(KERN_CONT "suspend not working...");
+ conf->error = -1;
+ return;
+ }
+
+ /* Let's collect some more trace - see if resume is working. */
+ conf->error = conf->resume(conf->tracer);
+ if (conf->error < 0)
+ return;
+
+ conf->error = conf->suspend(conf->tracer);
+ if (conf->error < 0)
+ return;
+
+ trace = ds_read_bts(conf->tracer);
+
+ conf->error = ds_selftest_bts_consistency(trace);
+ if (conf->error < 0)
+ return;
+
+ if (trace->ds.top == top) {
+ /*
+ * It is possible but highly unlikely that we got a
+ * buffer overflow and end up at exactly the same
+ * position we started from.
+ * Let's issue a warning and check the full trace.
+ */
+ printk(KERN_CONT
+ "no resume progress/overflow...");
+
+ conf->error =
+ ds_selftest_bts_read(conf->tracer, trace,
+ trace->ds.begin, trace->ds.end);
+ } else if (trace->ds.top < top) {
+ /*
+ * We had a buffer overflow - the entire buffer should
+ * contain trace records.
+ */
+ conf->error =
+ ds_selftest_bts_read(conf->tracer, trace,
+ trace->ds.begin, trace->ds.end);
+ } else {
+ /*
+ * It is quite likely that the buffer did not overflow.
+ * Let's just check the delta trace.
+ */
+ conf->error =
+ ds_selftest_bts_read(conf->tracer, trace, top,
+ trace->ds.top);
+ }
+ if (conf->error < 0)
+ return;
+
+ conf->error = 0;
+}
+
+static int ds_suspend_bts_wrap(struct bts_tracer *tracer)
+{
+ ds_suspend_bts(tracer);
+ return 0;
+}
+
+static int ds_resume_bts_wrap(struct bts_tracer *tracer)
+{
+ ds_resume_bts(tracer);
+ return 0;
+}
+
+static void ds_release_bts_noirq_wrap(void *tracer)
+{
+ (void)ds_release_bts_noirq(tracer);
+}
+
+static int ds_selftest_bts_bad_release_noirq(int cpu,
+ struct bts_tracer *tracer)
+{
+ int error = -EPERM;
+
+ /* Try to release the tracer on the wrong cpu. */
+ get_cpu();
+ if (cpu != smp_processor_id()) {
+ error = ds_release_bts_noirq(tracer);
+ if (error != -EPERM)
+ printk(KERN_CONT "release on wrong cpu...");
+ }
+ put_cpu();
+
+ return error ? 0 : -1;
+}
+
+static int ds_selftest_bts_bad_request_cpu(int cpu, void *buffer)
+{
+ struct bts_tracer *tracer;
+ int error;
+
+ /* Try to request cpu tracing while task tracing is active. */
+ tracer = ds_request_bts_cpu(cpu, buffer, BUFFER_SIZE, NULL,
+ (size_t)-1, BTS_KERNEL);
+ error = PTR_ERR(tracer);
+ if (!IS_ERR(tracer)) {
+ ds_release_bts(tracer);
+ error = 0;
+ }
+
+ if (error != -EPERM)
+ printk(KERN_CONT "cpu/task tracing overlap...");
+
+ return error ? 0 : -1;
+}
+
+static int ds_selftest_bts_bad_request_task(void *buffer)
+{
+ struct bts_tracer *tracer;
+ int error;
+
+ /* Try to request cpu tracing while task tracing is active. */
+ tracer = ds_request_bts_task(current, buffer, BUFFER_SIZE, NULL,
+ (size_t)-1, BTS_KERNEL);
+ error = PTR_ERR(tracer);
+ if (!IS_ERR(tracer)) {
+ error = 0;
+ ds_release_bts(tracer);
+ }
+
+ if (error != -EPERM)
+ printk(KERN_CONT "task/cpu tracing overlap...");
+
+ return error ? 0 : -1;
+}
+
+int ds_selftest_bts(void)
+{
+ struct ds_selftest_bts_conf conf;
+ unsigned char buffer[BUFFER_SIZE], *small_buffer;
+ unsigned long irq;
+ int cpu;
+
+ printk(KERN_INFO "[ds] bts selftest...");
+ conf.error = 0;
+
+ small_buffer = (unsigned char *)ALIGN((unsigned long)buffer, 8) + 8;
+
+ get_online_cpus();
+ for_each_online_cpu(cpu) {
+ conf.suspend = ds_suspend_bts_wrap;
+ conf.resume = ds_resume_bts_wrap;
+ conf.tracer =
+ ds_request_bts_cpu(cpu, buffer, BUFFER_SIZE,
+ NULL, (size_t)-1, BTS_KERNEL);
+ ds_selftest_bts_cpu(&conf);
+ if (conf.error >= 0)
+ conf.error = ds_selftest_bts_bad_request_task(buffer);
+ ds_release_bts(conf.tracer);
+ if (conf.error < 0)
+ goto out;
+
+ conf.suspend = ds_suspend_bts_noirq;
+ conf.resume = ds_resume_bts_noirq;
+ conf.tracer =
+ ds_request_bts_cpu(cpu, buffer, BUFFER_SIZE,
+ NULL, (size_t)-1, BTS_KERNEL);
+ smp_call_function_single(cpu, ds_selftest_bts_cpu, &conf, 1);
+ if (conf.error >= 0) {
+ conf.error =
+ ds_selftest_bts_bad_release_noirq(cpu,
+ conf.tracer);
+ /* We must not release the tracer twice. */
+ if (conf.error < 0)
+ conf.tracer = NULL;
+ }
+ if (conf.error >= 0)
+ conf.error = ds_selftest_bts_bad_request_task(buffer);
+ smp_call_function_single(cpu, ds_release_bts_noirq_wrap,
+ conf.tracer, 1);
+ if (conf.error < 0)
+ goto out;
+ }
+
+ conf.suspend = ds_suspend_bts_wrap;
+ conf.resume = ds_resume_bts_wrap;
+ conf.tracer =
+ ds_request_bts_task(current, buffer, BUFFER_SIZE,
+ NULL, (size_t)-1, BTS_KERNEL);
+ ds_selftest_bts_cpu(&conf);
+ if (conf.error >= 0)
+ conf.error = ds_selftest_bts_bad_request_cpu(0, buffer);
+ ds_release_bts(conf.tracer);
+ if (conf.error < 0)
+ goto out;
+
+ conf.suspend = ds_suspend_bts_noirq;
+ conf.resume = ds_resume_bts_noirq;
+ conf.tracer =
+ ds_request_bts_task(current, small_buffer, SMALL_BUFFER_SIZE,
+ NULL, (size_t)-1, BTS_KERNEL);
+ local_irq_save(irq);
+ ds_selftest_bts_cpu(&conf);
+ if (conf.error >= 0)
+ conf.error = ds_selftest_bts_bad_request_cpu(0, buffer);
+ ds_release_bts_noirq(conf.tracer);
+ local_irq_restore(irq);
+ if (conf.error < 0)
+ goto out;
+
+ conf.error = 0;
+ out:
+ put_online_cpus();
+ printk(KERN_CONT "%s.\n", (conf.error ? "failed" : "passed"));
+
+ return conf.error;
+}
+
+int ds_selftest_pebs(void)
+{
+ return 0;
+}
diff --git a/arch/x86/kernel/ds_selftest.h b/arch/x86/kernel/ds_selftest.h
new file mode 100644
index 0000000..2ba8745
--- /dev/null
+++ b/arch/x86/kernel/ds_selftest.h
@@ -0,0 +1,15 @@
+/*
+ * Debug Store support - selftest
+ *
+ *
+ * Copyright (C) 2009 Intel Corporation.
+ * Markus Metzger <markus.t.metzger@...el.com>, 2009
+ */
+
+#ifdef CONFIG_X86_DS_SELFTEST
+extern int ds_selftest_bts(void);
+extern int ds_selftest_pebs(void);
+#else
+static inline int ds_selftest_bts(void) { return 0; }
+static inline int ds_selftest_pebs(void) { return 0; }
+#endif
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 38946c6..987f91f 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -147,27 +147,14 @@ END(ftrace_graph_caller)
GLOBAL(return_to_handler)
subq $80, %rsp
+ /* Save the return values */
movq %rax, (%rsp)
- movq %rcx, 8(%rsp)
- movq %rdx, 16(%rsp)
- movq %rsi, 24(%rsp)
- movq %rdi, 32(%rsp)
- movq %r8, 40(%rsp)
- movq %r9, 48(%rsp)
- movq %r10, 56(%rsp)
- movq %r11, 64(%rsp)
+ movq %rdx, 8(%rsp)
call ftrace_return_to_handler
movq %rax, 72(%rsp)
- movq 64(%rsp), %r11
- movq 56(%rsp), %r10
- movq 48(%rsp), %r9
- movq 40(%rsp), %r8
- movq 32(%rsp), %rdi
- movq 24(%rsp), %rsi
- movq 16(%rsp), %rdx
- movq 8(%rsp), %rcx
+ movq 8(%rsp), %rdx
movq (%rsp), %rax
addq $72, %rsp
retq
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index ca98915..fb5dfb8 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -14,6 +14,7 @@
#include <asm/idle.h>
#include <asm/uaccess.h>
#include <asm/i387.h>
+#include <asm/ds.h>
unsigned long idle_halt;
EXPORT_SYMBOL(idle_halt);
@@ -45,6 +46,8 @@ void free_thread_xstate(struct task_struct *tsk)
kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
tsk->thread.xstate = NULL;
}
+
+ WARN(tsk->thread.ds_ctx, "leaking DS context\n");
}
void free_thread_info(struct thread_info *ti)
@@ -83,8 +86,6 @@ void exit_thread(void)
put_cpu();
kfree(bp);
}
-
- ds_exit_thread(current);
}
void flush_thread(void)
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 76f8f84..b5e4bfe 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -290,7 +290,8 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
p->thread.io_bitmap_max = 0;
}
- ds_copy_thread(p, current);
+ clear_tsk_thread_flag(p, TIF_DS_AREA_MSR);
+ p->thread.ds_ctx = NULL;
clear_tsk_thread_flag(p, TIF_DEBUGCTLMSR);
p->thread.debugctlmsr = 0;
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index b751a41..5a1a1de 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -335,7 +335,8 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
goto out;
}
- ds_copy_thread(p, me);
+ clear_tsk_thread_flag(p, TIF_DS_AREA_MSR);
+ p->thread.ds_ctx = NULL;
clear_tsk_thread_flag(p, TIF_DEBUGCTLMSR);
p->thread.debugctlmsr = 0;
diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index 23b7c8f..09ecbde 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -21,6 +21,7 @@
#include <linux/audit.h>
#include <linux/seccomp.h>
#include <linux/signal.h>
+#include <linux/workqueue.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
@@ -578,17 +579,130 @@ static int ioperm_get(struct task_struct *target,
}
#ifdef CONFIG_X86_PTRACE_BTS
+/*
+ * A branch trace store context.
+ *
+ * Contexts may only be installed by ptrace_bts_config() and only for
+ * ptraced tasks.
+ *
+ * Contexts are destroyed when the tracee is detached from the tracer.
+ * The actual destruction work requires interrupts enabled, so the
+ * work is deferred and will be scheduled during __ptrace_unlink().
+ *
+ * Contexts hold an additional task_struct reference on the traced
+ * task, as well as a reference on the tracer's mm.
+ *
+ * Ptrace already holds a task_struct for the duration of ptrace operations,
+ * but since destruction is deferred, it may be executed after both
+ * tracer and tracee exited.
+ */
+struct bts_context {
+ /* The branch trace handle. */
+ struct bts_tracer *tracer;
+
+ /* The buffer used to store the branch trace and its size. */
+ void *buffer;
+ unsigned int size;
+
+ /* The mm that paid for the above buffer. */
+ struct mm_struct *mm;
+
+ /* The task this context belongs to. */
+ struct task_struct *task;
+
+ /* The signal to send on a bts buffer overflow. */
+ unsigned int bts_ovfl_signal;
+
+ /* The work struct to destroy a context. */
+ struct work_struct work;
+};
+
+static int alloc_bts_buffer(struct bts_context *context, unsigned int size)
+{
+ void *buffer = NULL;
+ int err = -ENOMEM;
+
+ err = account_locked_memory(current->mm, current->signal->rlim, size);
+ if (err < 0)
+ return err;
+
+ buffer = kzalloc(size, GFP_KERNEL);
+ if (!buffer)
+ goto out_refund;
+
+ context->buffer = buffer;
+ context->size = size;
+ context->mm = get_task_mm(current);
+
+ return 0;
+
+ out_refund:
+ refund_locked_memory(current->mm, size);
+ return err;
+}
+
+static inline void free_bts_buffer(struct bts_context *context)
+{
+ if (!context->buffer)
+ return;
+
+ kfree(context->buffer);
+ context->buffer = NULL;
+
+ refund_locked_memory(context->mm, context->size);
+ context->size = 0;
+
+ mmput(context->mm);
+ context->mm = NULL;
+}
+
+static void free_bts_context_work(struct work_struct *w)
+{
+ struct bts_context *context;
+
+ context = container_of(w, struct bts_context, work);
+
+ ds_release_bts(context->tracer);
+ put_task_struct(context->task);
+ free_bts_buffer(context);
+ kfree(context);
+}
+
+static inline void free_bts_context(struct bts_context *context)
+{
+ INIT_WORK(&context->work, free_bts_context_work);
+ schedule_work(&context->work);
+}
+
+static inline struct bts_context *alloc_bts_context(struct task_struct *task)
+{
+ struct bts_context *context = kzalloc(sizeof(*context), GFP_KERNEL);
+ if (context) {
+ context->task = task;
+ task->bts = context;
+
+ get_task_struct(task);
+ }
+
+ return context;
+}
+
static int ptrace_bts_read_record(struct task_struct *child, size_t index,
struct bts_struct __user *out)
{
+ struct bts_context *context;
const struct bts_trace *trace;
struct bts_struct bts;
const unsigned char *at;
int error;
- trace = ds_read_bts(child->bts);
+ context = child->bts;
+ if (!context)
+ return -ESRCH;
+
+ trace = ds_read_bts(context->tracer);
if (!trace)
- return -EPERM;
+ return -ESRCH;
at = trace->ds.top - ((index + 1) * trace->ds.size);
if ((void *)at < trace->ds.begin)
@@ -597,7 +711,7 @@ static int ptrace_bts_read_record(struct task_struct *child, size_t index,
if (!trace->read)
return -EOPNOTSUPP;
- error = trace->read(child->bts, at, &bts);
+ error = trace->read(context->tracer, at, &bts);
if (error < 0)
return error;
@@ -611,13 +725,18 @@ static int ptrace_bts_drain(struct task_struct *child,
long size,
struct bts_struct __user *out)
{
+ struct bts_context *context;
const struct bts_trace *trace;
const unsigned char *at;
int error, drained = 0;
- trace = ds_read_bts(child->bts);
+ context = child->bts;
+ if (!context)
+ return -ESRCH;
+
+ trace = ds_read_bts(context->tracer);
if (!trace)
- return -EPERM;
+ return -ESRCH;
if (!trace->read)
return -EOPNOTSUPP;
@@ -628,9 +747,8 @@ static int ptrace_bts_drain(struct task_struct *child,
for (at = trace->ds.begin; (void *)at < trace->ds.top;
out++, drained++, at += trace->ds.size) {
struct bts_struct bts;
- int error;
- error = trace->read(child->bts, at, &bts);
+ error = trace->read(context->tracer, at, &bts);
if (error < 0)
return error;
@@ -640,35 +758,18 @@ static int ptrace_bts_drain(struct task_struct *child,
memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size);
- error = ds_reset_bts(child->bts);
+ error = ds_reset_bts(context->tracer);
if (error < 0)
return error;
return drained;
}
-static int ptrace_bts_allocate_buffer(struct task_struct *child, size_t size)
-{
- child->bts_buffer = alloc_locked_buffer(size);
- if (!child->bts_buffer)
- return -ENOMEM;
-
- child->bts_size = size;
-
- return 0;
-}
-
-static void ptrace_bts_free_buffer(struct task_struct *child)
-{
- free_locked_buffer(child->bts_buffer, child->bts_size);
- child->bts_buffer = NULL;
- child->bts_size = 0;
-}
-
static int ptrace_bts_config(struct task_struct *child,
long cfg_size,
const struct ptrace_bts_config __user *ucfg)
{
+ struct bts_context *context;
struct ptrace_bts_config cfg;
unsigned int flags = 0;
@@ -678,28 +779,33 @@ static int ptrace_bts_config(struct task_struct *child,
if (copy_from_user(&cfg, ucfg, sizeof(cfg)))
return -EFAULT;
- if (child->bts) {
- ds_release_bts(child->bts);
- child->bts = NULL;
- }
+ context = child->bts;
+ if (!context)
+ context = alloc_bts_context(child);
+ if (!context)
+ return -ENOMEM;
if (cfg.flags & PTRACE_BTS_O_SIGNAL) {
if (!cfg.signal)
return -EINVAL;
- child->thread.bts_ovfl_signal = cfg.signal;
return -EOPNOTSUPP;
+ context->bts_ovfl_signal = cfg.signal;
}
- if ((cfg.flags & PTRACE_BTS_O_ALLOC) &&
- (cfg.size != child->bts_size)) {
- int error;
+ ds_release_bts(context->tracer);
+ context->tracer = NULL;
- ptrace_bts_free_buffer(child);
+ if ((cfg.flags & PTRACE_BTS_O_ALLOC) && (cfg.size != context->size)) {
+ int err;
- error = ptrace_bts_allocate_buffer(child, cfg.size);
- if (error < 0)
- return error;
+ free_bts_buffer(context);
+ if (!cfg.size)
+ return 0;
+
+ err = alloc_bts_buffer(context, cfg.size);
+ if (err < 0)
+ return err;
}
if (cfg.flags & PTRACE_BTS_O_TRACE)
@@ -708,15 +814,14 @@ static int ptrace_bts_config(struct task_struct *child,
if (cfg.flags & PTRACE_BTS_O_SCHED)
flags |= BTS_TIMESTAMPS;
- child->bts = ds_request_bts(child, child->bts_buffer, child->bts_size,
- /* ovfl = */ NULL, /* th = */ (size_t)-1,
- flags);
- if (IS_ERR(child->bts)) {
- int error = PTR_ERR(child->bts);
-
- ptrace_bts_free_buffer(child);
- child->bts = NULL;
+ context->tracer =
+ ds_request_bts_task(child, context->buffer, context->size,
+ NULL, (size_t)-1, flags);
+ if (unlikely(IS_ERR(context->tracer))) {
+ int error = PTR_ERR(context->tracer);
+ free_bts_buffer(context);
+ context->tracer = NULL;
return error;
}
@@ -727,20 +832,25 @@ static int ptrace_bts_status(struct task_struct *child,
long cfg_size,
struct ptrace_bts_config __user *ucfg)
{
+ struct bts_context *context;
const struct bts_trace *trace;
struct ptrace_bts_config cfg;
+ context = child->bts;
+ if (!context)
+ return -ESRCH;
+
if (cfg_size < sizeof(cfg))
return -EIO;
- trace = ds_read_bts(child->bts);
+ trace = ds_read_bts(context->tracer);
if (!trace)
- return -EPERM;
+ return -ESRCH;
memset(&cfg, 0, sizeof(cfg));
- cfg.size = trace->ds.end - trace->ds.begin;
- cfg.signal = child->thread.bts_ovfl_signal;
- cfg.bts_size = sizeof(struct bts_struct);
+ cfg.size = trace->ds.end - trace->ds.begin;
+ cfg.signal = context->bts_ovfl_signal;
+ cfg.bts_size = sizeof(struct bts_struct);
if (cfg.signal)
cfg.flags |= PTRACE_BTS_O_SIGNAL;
@@ -759,80 +869,51 @@ static int ptrace_bts_status(struct task_struct *child,
static int ptrace_bts_clear(struct task_struct *child)
{
+ struct bts_context *context;
const struct bts_trace *trace;
- trace = ds_read_bts(child->bts);
+ context = child->bts;
+ if (!context)
+ return -ESRCH;
+
+ trace = ds_read_bts(context->tracer);
if (!trace)
- return -EPERM;
+ return -ESRCH;
memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size);
- return ds_reset_bts(child->bts);
+ return ds_reset_bts(context->tracer);
}
static int ptrace_bts_size(struct task_struct *child)
{
+ struct bts_context *context;
const struct bts_trace *trace;
- trace = ds_read_bts(child->bts);
+ context = child->bts;
+ if (!context)
+ return -ESRCH;
+
+ trace = ds_read_bts(context->tracer);
if (!trace)
- return -EPERM;
+ return -ESRCH;
return (trace->ds.top - trace->ds.begin) / trace->ds.size;
}
-static void ptrace_bts_fork(struct task_struct *tsk)
-{
- tsk->bts = NULL;
- tsk->bts_buffer = NULL;
- tsk->bts_size = 0;
- tsk->thread.bts_ovfl_signal = 0;
-}
-
-static void ptrace_bts_untrace(struct task_struct *child)
+/*
+ * Called from __ptrace_unlink() after the child has been moved back
+ * to its original parent.
+ */
+void ptrace_bts_untrace(struct task_struct *child)
{
if (unlikely(child->bts)) {
- ds_release_bts(child->bts);
+ free_bts_context(child->bts);
child->bts = NULL;
-
- /* We cannot update total_vm and locked_vm since
- child's mm is already gone. But we can reclaim the
- memory. */
- kfree(child->bts_buffer);
- child->bts_buffer = NULL;
- child->bts_size = 0;
}
}
-
-static void ptrace_bts_detach(struct task_struct *child)
-{
- /*
- * Ptrace_detach() races with ptrace_untrace() in case
- * the child dies and is reaped by another thread.
- *
- * We only do the memory accounting at this point and
- * leave the buffer deallocation and the bts tracer
- * release to ptrace_bts_untrace() which will be called
- * later on with tasklist_lock held.
- */
- release_locked_buffer(child->bts_buffer, child->bts_size);
-}
-#else
-static inline void ptrace_bts_fork(struct task_struct *tsk) {}
-static inline void ptrace_bts_detach(struct task_struct *child) {}
-static inline void ptrace_bts_untrace(struct task_struct *child) {}
#endif /* CONFIG_X86_PTRACE_BTS */
-void x86_ptrace_fork(struct task_struct *child, unsigned long clone_flags)
-{
- ptrace_bts_fork(child);
-}
-
-void x86_ptrace_untrace(struct task_struct *child)
-{
- ptrace_bts_untrace(child);
-}
-
/*
* Called by kernel/ptrace.c when detaching..
*
@@ -844,7 +925,6 @@ void ptrace_disable(struct task_struct *child)
#ifdef TIF_SYSCALL_EMU
clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
#endif
- ptrace_bts_detach(child);
}
#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c
index f7bddc2..4aaf7e4 100644
--- a/arch/x86/kernel/stacktrace.c
+++ b/arch/x86/kernel/stacktrace.c
@@ -20,7 +20,7 @@ save_stack_warning_symbol(void *data, char *msg, unsigned long symbol)
static int save_stack_stack(void *data, char *name)
{
- return -1;
+ return 0;
}
static void save_stack_address(void *data, unsigned long addr, int reliable)
diff --git a/arch/x86/mm/kmmio.c b/arch/x86/mm/kmmio.c
index 50dc802..16ccbd7 100644
--- a/arch/x86/mm/kmmio.c
+++ b/arch/x86/mm/kmmio.c
@@ -32,7 +32,7 @@ struct kmmio_fault_page {
struct list_head list;
struct kmmio_fault_page *release_next;
unsigned long page; /* location of the fault page */
- bool old_presence; /* page presence prior to arming */
+ pteval_t old_presence; /* page presence prior to arming */
bool armed;
/*
@@ -97,60 +97,62 @@ static struct kmmio_probe *get_kmmio_probe(unsigned long addr)
static struct kmmio_fault_page *get_kmmio_fault_page(unsigned long page)
{
struct list_head *head;
- struct kmmio_fault_page *p;
+ struct kmmio_fault_page *f;
page &= PAGE_MASK;
head = kmmio_page_list(page);
- list_for_each_entry_rcu(p, head, list) {
- if (p->page == page)
- return p;
+ list_for_each_entry_rcu(f, head, list) {
+ if (f->page == page)
+ return f;
}
return NULL;
}
-static void set_pmd_presence(pmd_t *pmd, bool present, bool *old)
+static void clear_pmd_presence(pmd_t *pmd, bool clear, pmdval_t *old)
{
pmdval_t v = pmd_val(*pmd);
- *old = !!(v & _PAGE_PRESENT);
- v &= ~_PAGE_PRESENT;
- if (present)
- v |= _PAGE_PRESENT;
+ if (clear) {
+ *old = v & _PAGE_PRESENT;
+ v &= ~_PAGE_PRESENT;
+ } else /* presume this has been called with clear==true previously */
+ v |= *old;
set_pmd(pmd, __pmd(v));
}
-static void set_pte_presence(pte_t *pte, bool present, bool *old)
+static void clear_pte_presence(pte_t *pte, bool clear, pteval_t *old)
{
pteval_t v = pte_val(*pte);
- *old = !!(v & _PAGE_PRESENT);
- v &= ~_PAGE_PRESENT;
- if (present)
- v |= _PAGE_PRESENT;
+ if (clear) {
+ *old = v & _PAGE_PRESENT;
+ v &= ~_PAGE_PRESENT;
+ } else /* presume this has been called with clear==true previously */
+ v |= *old;
set_pte_atomic(pte, __pte(v));
}
-static int set_page_presence(unsigned long addr, bool present, bool *old)
+static int clear_page_presence(struct kmmio_fault_page *f, bool clear)
{
unsigned int level;
- pte_t *pte = lookup_address(addr, &level);
+ pte_t *pte = lookup_address(f->page, &level);
if (!pte) {
- pr_err("kmmio: no pte for page 0x%08lx\n", addr);
+ pr_err("kmmio: no pte for page 0x%08lx\n", f->page);
return -1;
}
switch (level) {
case PG_LEVEL_2M:
- set_pmd_presence((pmd_t *)pte, present, old);
+ clear_pmd_presence((pmd_t *)pte, clear, &f->old_presence);
break;
case PG_LEVEL_4K:
- set_pte_presence(pte, present, old);
+ clear_pte_presence(pte, clear, &f->old_presence);
break;
default:
pr_err("kmmio: unexpected page level 0x%x.\n", level);
return -1;
}
- __flush_tlb_one(addr);
+ __flush_tlb_one(f->page);
return 0;
}
@@ -171,9 +173,9 @@ static int arm_kmmio_fault_page(struct kmmio_fault_page *f)
WARN_ONCE(f->armed, KERN_ERR "kmmio page already armed.\n");
if (f->armed) {
pr_warning("kmmio double-arm: page 0x%08lx, ref %d, old %d\n",
- f->page, f->count, f->old_presence);
+ f->page, f->count, !!f->old_presence);
}
- ret = set_page_presence(f->page, false, &f->old_presence);
+ ret = clear_page_presence(f, true);
WARN_ONCE(ret < 0, KERN_ERR "kmmio arming 0x%08lx failed.\n", f->page);
f->armed = true;
return ret;
@@ -182,8 +184,7 @@ static int arm_kmmio_fault_page(struct kmmio_fault_page *f)
/** Restore the given page to saved presence state. */
static void disarm_kmmio_fault_page(struct kmmio_fault_page *f)
{
- bool tmp;
- int ret = set_page_presence(f->page, f->old_presence, &tmp);
+ int ret = clear_page_presence(f, false);
WARN_ONCE(ret < 0,
KERN_ERR "kmmio disarming 0x%08lx failed.\n", f->page);
f->armed = false;
@@ -310,7 +311,12 @@ static int post_kmmio_handler(unsigned long condition, struct pt_regs *regs)
struct kmmio_context *ctx = &get_cpu_var(kmmio_ctx);
if (!ctx->active) {
- pr_debug("kmmio: spurious debug trap on CPU %d.\n",
+ /*
+ * debug traps without an active context are due to either
+ * something external causing them (f.e. using a debugger while
+ * mmio tracing enabled), or erroneous behaviour
+ */
+ pr_warning("kmmio: unexpected debug trap on CPU %d.\n",
smp_processor_id());
goto out;
}
@@ -439,12 +445,12 @@ static void rcu_free_kmmio_fault_pages(struct rcu_head *head)
head,
struct kmmio_delayed_release,
rcu);
- struct kmmio_fault_page *p = dr->release_list;
- while (p) {
- struct kmmio_fault_page *next = p->release_next;
- BUG_ON(p->count);
- kfree(p);
- p = next;
+ struct kmmio_fault_page *f = dr->release_list;
+ while (f) {
+ struct kmmio_fault_page *next = f->release_next;
+ BUG_ON(f->count);
+ kfree(f);
+ f = next;
}
kfree(dr);
}
@@ -453,19 +459,19 @@ static void remove_kmmio_fault_pages(struct rcu_head *head)
{
struct kmmio_delayed_release *dr =
container_of(head, struct kmmio_delayed_release, rcu);
- struct kmmio_fault_page *p = dr->release_list;
+ struct kmmio_fault_page *f = dr->release_list;
struct kmmio_fault_page **prevp = &dr->release_list;
unsigned long flags;
spin_lock_irqsave(&kmmio_lock, flags);
- while (p) {
- if (!p->count) {
- list_del_rcu(&p->list);
- prevp = &p->release_next;
+ while (f) {
+ if (!f->count) {
+ list_del_rcu(&f->list);
+ prevp = &f->release_next;
} else {
- *prevp = p->release_next;
+ *prevp = f->release_next;
}
- p = p->release_next;
+ f = f->release_next;
}
spin_unlock_irqrestore(&kmmio_lock, flags);
@@ -528,8 +534,8 @@ void unregister_kmmio_probe(struct kmmio_probe *p)
}
EXPORT_SYMBOL(unregister_kmmio_probe);
-static int kmmio_die_notifier(struct notifier_block *nb, unsigned long val,
- void *args)
+static int
+kmmio_die_notifier(struct notifier_block *nb, unsigned long val, void *args)
{
struct die_args *arg = args;
@@ -544,11 +550,23 @@ static struct notifier_block nb_die = {
.notifier_call = kmmio_die_notifier
};
-static int __init init_kmmio(void)
+int kmmio_init(void)
{
int i;
+
for (i = 0; i < KMMIO_PAGE_TABLE_SIZE; i++)
INIT_LIST_HEAD(&kmmio_page_table[i]);
+
return register_die_notifier(&nb_die);
}
-fs_initcall(init_kmmio); /* should be before device_initcall() */
+
+void kmmio_cleanup(void)
+{
+ int i;
+
+ unregister_die_notifier(&nb_die);
+ for (i = 0; i < KMMIO_PAGE_TABLE_SIZE; i++) {
+ WARN_ONCE(!list_empty(&kmmio_page_table[i]),
+ KERN_ERR "kmmio_page_table not empty at cleanup, any further tracing will leak memory.\n");
+ }
+}
diff --git a/arch/x86/mm/mmio-mod.c b/arch/x86/mm/mmio-mod.c
index c9342ed..132772a 100644
--- a/arch/x86/mm/mmio-mod.c
+++ b/arch/x86/mm/mmio-mod.c
@@ -451,6 +451,7 @@ void enable_mmiotrace(void)
if (nommiotrace)
pr_info(NAME "MMIO tracing disabled.\n");
+ kmmio_init();
enter_uniprocessor();
spin_lock_irq(&trace_lock);
atomic_inc(&mmiotrace_enabled);
@@ -473,6 +474,7 @@ void disable_mmiotrace(void)
clear_trace_list(); /* guarantees: no more kmmio callbacks */
leave_uniprocessor();
+ kmmio_cleanup();
pr_info(NAME "disabled.\n");
out:
mutex_unlock(&mmiotrace_mutex);
diff --git a/block/blk-core.c b/block/blk-core.c
index c89883b..9475bf9 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -28,22 +28,14 @@
#include <linux/task_io_accounting_ops.h>
#include <linux/blktrace_api.h>
#include <linux/fault-inject.h>
-#include <trace/block.h>
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/block.h>
#include "blk.h"
-DEFINE_TRACE(block_plug);
-DEFINE_TRACE(block_unplug_io);
-DEFINE_TRACE(block_unplug_timer);
-DEFINE_TRACE(block_getrq);
-DEFINE_TRACE(block_sleeprq);
-DEFINE_TRACE(block_rq_requeue);
-DEFINE_TRACE(block_bio_backmerge);
-DEFINE_TRACE(block_bio_frontmerge);
-DEFINE_TRACE(block_bio_queue);
-DEFINE_TRACE(block_rq_complete);
-DEFINE_TRACE(block_remap); /* Also used in drivers/md/dm.c */
EXPORT_TRACEPOINT_SYMBOL_GPL(block_remap);
+EXPORT_TRACEPOINT_SYMBOL_GPL(block_bio_complete);
static int __make_request(struct request_queue *q, struct bio *bio);
@@ -1277,7 +1269,7 @@ static inline void blk_partition_remap(struct bio *bio)
bio->bi_bdev = bdev->bd_contains;
trace_block_remap(bdev_get_queue(bio->bi_bdev), bio,
- bdev->bd_dev, bio->bi_sector,
+ bdev->bd_dev,
bio->bi_sector - p->start_sect);
}
}
@@ -1446,8 +1438,7 @@ static inline void __generic_make_request(struct bio *bio)
goto end_io;
if (old_sector != -1)
- trace_block_remap(q, bio, old_dev, bio->bi_sector,
- old_sector);
+ trace_block_remap(q, bio, old_dev, old_sector);
trace_block_bio_queue(q, bio);
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 3ff9bba..26f9ec2 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -383,16 +383,21 @@ struct kobj_type blk_queue_ktype = {
int blk_register_queue(struct gendisk *disk)
{
int ret;
+ struct device *dev = disk_to_dev(disk);
struct request_queue *q = disk->queue;
if (WARN_ON(!q))
return -ENXIO;
+ ret = blk_trace_init_sysfs(dev);
+ if (ret)
+ return ret;
+
if (!q->request_fn)
return 0;
- ret = kobject_add(&q->kobj, kobject_get(&disk_to_dev(disk)->kobj),
+ ret = kobject_add(&q->kobj, kobject_get(&dev->kobj),
"%s", "queue");
if (ret < 0)
return ret;
diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
index f87615d..f8c218c 100644
--- a/block/compat_ioctl.c
+++ b/block/compat_ioctl.c
@@ -568,7 +568,7 @@ static int compat_blk_trace_setup(struct block_device *bdev, char __user *arg)
memcpy(&buts.name, &cbuts.name, 32);
mutex_lock(&bdev->bd_mutex);
- ret = do_blk_trace_setup(q, b, bdev->bd_dev, &buts);
+ ret = do_blk_trace_setup(q, b, bdev->bd_dev, bdev, &buts);
mutex_unlock(&bdev->bd_mutex);
if (ret)
return ret;
diff --git a/block/elevator.c b/block/elevator.c
index 7073a90..e220f0c 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -33,17 +33,16 @@
#include <linux/compiler.h>
#include <linux/delay.h>
#include <linux/blktrace_api.h>
-#include <trace/block.h>
#include <linux/hash.h>
#include <linux/uaccess.h>
+#include <trace/events/block.h>
+
#include "blk.h"
static DEFINE_SPINLOCK(elv_list_lock);
static LIST_HEAD(elv_list);
-DEFINE_TRACE(block_rq_abort);
-
/*
* Merge hash stuff.
*/
@@ -55,9 +54,6 @@ static const int elv_hash_shift = 6;
#define rq_hash_key(rq) ((rq)->sector + (rq)->nr_sectors)
#define ELV_ON_HASH(rq) (!hlist_unhashed(&(rq)->hash))
-DEFINE_TRACE(block_rq_insert);
-DEFINE_TRACE(block_rq_issue);
-
/*
* Query io scheduler to see if the current process issuing bio may be
* merged with rq.
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 424f7b0..3fd8b1e 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -20,7 +20,8 @@
#include <linux/idr.h>
#include <linux/hdreg.h>
#include <linux/blktrace_api.h>
-#include <trace/block.h>
+
+#include <trace/events/block.h>
#define DM_MSG_PREFIX "core"
@@ -53,8 +54,6 @@ struct dm_target_io {
union map_info info;
};
-DEFINE_TRACE(block_bio_complete);
-
/*
* For request-based dm.
* One of these is allocated per request.
@@ -656,8 +655,7 @@ static void __map_bio(struct dm_target *ti, struct bio *clone,
/* the bio has been remapped so dispatch it */
trace_block_remap(bdev_get_queue(clone->bi_bdev), clone,
- tio->io->bio->bi_bdev->bd_dev,
- clone->bi_sector, sector);
+ tio->io->bio->bi_bdev->bd_dev, sector);
generic_make_request(clone);
} else if (r < 0 || r == DM_MAPIO_REQUEUE) {
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index e1716f1..91e316f 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1065,6 +1065,7 @@ sg_ioctl(struct inode *inode, struct file *filp,
return blk_trace_setup(sdp->device->request_queue,
sdp->disk->disk_name,
MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
+ NULL,
(char *)arg);
case BLKTRACESTART:
return blk_trace_startstop(sdp->device->request_queue, 1);
diff --git a/fs/bio.c b/fs/bio.c
index 9871164..740699c 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -26,10 +26,9 @@
#include <linux/mempool.h>
#include <linux/workqueue.h>
#include <linux/blktrace_api.h>
-#include <trace/block.h>
#include <scsi/sg.h> /* for struct sg_iovec */
-DEFINE_TRACE(block_split);
+#include <trace/events/block.h>
/*
* Test patch to inline a certain number of bi_io_vec's inside the bio
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 89853bc..f1736ca 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -63,7 +63,7 @@
#define BRANCH_PROFILE()
#endif
-#ifdef CONFIG_EVENT_TRACER
+#ifdef CONFIG_EVENT_TRACING
#define FTRACE_EVENTS() VMLINUX_SYMBOL(__start_ftrace_events) = .; \
*(_ftrace_events) \
VMLINUX_SYMBOL(__stop_ftrace_events) = .;
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
index d960889..7e4350e 100644
--- a/include/linux/blktrace_api.h
+++ b/include/linux/blktrace_api.h
@@ -116,9 +116,9 @@ struct blk_io_trace {
* The remap event
*/
struct blk_io_trace_remap {
- __be32 device;
__be32 device_from;
- __be64 sector;
+ __be32 device_to;
+ __be64 sector_from;
};
enum {
@@ -165,8 +165,9 @@ struct blk_trace {
extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
extern void blk_trace_shutdown(struct request_queue *);
-extern int do_blk_trace_setup(struct request_queue *q,
- char *name, dev_t dev, struct blk_user_trace_setup *buts);
+extern int do_blk_trace_setup(struct request_queue *q, char *name,
+ dev_t dev, struct block_device *bdev,
+ struct blk_user_trace_setup *buts);
extern void __trace_note_message(struct blk_trace *, const char *fmt, ...);
/**
@@ -193,22 +194,42 @@ extern void __trace_note_message(struct blk_trace *, const char *fmt, ...);
extern void blk_add_driver_data(struct request_queue *q, struct request *rq,
void *data, size_t len);
extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
+ struct block_device *bdev,
char __user *arg);
extern int blk_trace_startstop(struct request_queue *q, int start);
extern int blk_trace_remove(struct request_queue *q);
+extern int blk_trace_init_sysfs(struct device *dev);
extern struct attribute_group blk_trace_attr_group;
#else /* !CONFIG_BLK_DEV_IO_TRACE */
-#define blk_trace_ioctl(bdev, cmd, arg) (-ENOTTY)
-#define blk_trace_shutdown(q) do { } while (0)
-#define do_blk_trace_setup(q, name, dev, buts) (-ENOTTY)
-#define blk_add_driver_data(q, rq, data, len) do {} while (0)
-#define blk_trace_setup(q, name, dev, arg) (-ENOTTY)
-#define blk_trace_startstop(q, start) (-ENOTTY)
-#define blk_trace_remove(q) (-ENOTTY)
-#define blk_add_trace_msg(q, fmt, ...) do { } while (0)
+# define blk_trace_ioctl(bdev, cmd, arg) (-ENOTTY)
+# define blk_trace_shutdown(q) do { } while (0)
+# define do_blk_trace_setup(q, name, dev, bdev, buts) (-ENOTTY)
+# define blk_add_driver_data(q, rq, data, len) do {} while (0)
+# define blk_trace_setup(q, name, dev, bdev, arg) (-ENOTTY)
+# define blk_trace_startstop(q, start) (-ENOTTY)
+# define blk_trace_remove(q) (-ENOTTY)
+# define blk_add_trace_msg(q, fmt, ...) do { } while (0)
+static inline int blk_trace_init_sysfs(struct device *dev)
+{
+ return 0;
+}
#endif /* CONFIG_BLK_DEV_IO_TRACE */
+
+#if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK)
+
+static inline int blk_cmd_buf_len(struct request *rq)
+{
+ return blk_pc_request(rq) ? rq->cmd_len * 3 : 1;
+}
+
+extern void blk_dump_cmd(char *buf, struct request *rq);
+extern void blk_fill_rwbs(char *rwbs, u32 rw, int bytes);
+extern void blk_fill_rwbs_rq(char *rwbs, struct request *rq);
+
+#endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */
+
#endif /* __KERNEL__ */
#endif
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 8a0c2f2..39b95c5 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -233,8 +233,6 @@ extern int ftrace_arch_read_dyn_info(char *buf, int size);
extern int skip_trace(unsigned long ip);
-extern void ftrace_release(void *start, unsigned long size);
-
extern void ftrace_disable_daemon(void);
extern void ftrace_enable_daemon(void);
#else
@@ -325,13 +323,8 @@ static inline void __ftrace_enabled_restore(int enabled)
#ifdef CONFIG_FTRACE_MCOUNT_RECORD
extern void ftrace_init(void);
-extern void ftrace_init_module(struct module *mod,
- unsigned long *start, unsigned long *end);
#else
static inline void ftrace_init(void) { }
-static inline void
-ftrace_init_module(struct module *mod,
- unsigned long *start, unsigned long *end) { }
#endif
/*
@@ -368,6 +361,7 @@ struct ftrace_ret_stack {
unsigned long ret;
unsigned long func;
unsigned long long calltime;
+ unsigned long long subtime;
};
/*
@@ -379,8 +373,6 @@ extern void return_to_handler(void);
extern int
ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth);
-extern void
-ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret);
/*
* Sometimes we don't want to trace a function with the function
@@ -496,8 +488,15 @@ static inline int test_tsk_trace_graph(struct task_struct *tsk)
extern int ftrace_dump_on_oops;
+#ifdef CONFIG_PREEMPT
+#define INIT_TRACE_RECURSION .trace_recursion = 0,
+#endif
+
#endif /* CONFIG_TRACING */
+#ifndef INIT_TRACE_RECURSION
+#define INIT_TRACE_RECURSION
+#endif
#ifdef CONFIG_HW_BRANCH_TRACER
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
new file mode 100644
index 0000000..5c093ff
--- /dev/null
+++ b/include/linux/ftrace_event.h
@@ -0,0 +1,172 @@
+#ifndef _LINUX_FTRACE_EVENT_H
+#define _LINUX_FTRACE_EVENT_H
+
+#include <linux/trace_seq.h>
+#include <linux/ring_buffer.h>
+#include <linux/percpu.h>
+
+struct trace_array;
+struct tracer;
+struct dentry;
+
+DECLARE_PER_CPU(struct trace_seq, ftrace_event_seq);
+
+struct trace_print_flags {
+ unsigned long mask;
+ const char *name;
+};
+
+const char *ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
+ unsigned long flags,
+ const struct trace_print_flags *flag_array);
+
+const char *ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
+ const struct trace_print_flags *symbol_array);
+
+/*
+ * The trace entry - the most basic unit of tracing. This is what
+ * is printed in the end as a single line in the trace output, such as:
+ *
+ * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
+ */
+struct trace_entry {
+ unsigned short type;
+ unsigned char flags;
+ unsigned char preempt_count;
+ int pid;
+ int tgid;
+};
+
+#define FTRACE_MAX_EVENT \
+ ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1)
+
+/*
+ * Trace iterator - used by printout routines who present trace
+ * results to users and which routines might sleep, etc:
+ */
+struct trace_iterator {
+ struct trace_array *tr;
+ struct tracer *trace;
+ void *private;
+ int cpu_file;
+ struct mutex mutex;
+ struct ring_buffer_iter *buffer_iter[NR_CPUS];
+ unsigned long iter_flags;
+
+ /* The below is zeroed out in pipe_read */
+ struct trace_seq seq;
+ struct trace_entry *ent;
+ int cpu;
+ u64 ts;
+
+ loff_t pos;
+ long idx;
+
+ cpumask_var_t started;
+};
+
+
+typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
+ int flags);
+struct trace_event {
+ struct hlist_node node;
+ struct list_head list;
+ int type;
+ trace_print_func trace;
+ trace_print_func raw;
+ trace_print_func hex;
+ trace_print_func binary;
+};
+
+extern int register_ftrace_event(struct trace_event *event);
+extern int unregister_ftrace_event(struct trace_event *event);
+
+/* Return values for print_line callback */
+enum print_line_t {
+ TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
+ TRACE_TYPE_HANDLED = 1,
+ TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */
+ TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */
+};
+
+
+struct ring_buffer_event *
+trace_current_buffer_lock_reserve(int type, unsigned long len,
+ unsigned long flags, int pc);
+void trace_current_buffer_unlock_commit(struct ring_buffer_event *event,
+ unsigned long flags, int pc);
+void trace_nowake_buffer_unlock_commit(struct ring_buffer_event *event,
+ unsigned long flags, int pc);
+void trace_current_buffer_discard_commit(struct ring_buffer_event *event);
+
+void tracing_record_cmdline(struct task_struct *tsk);
+
+struct ftrace_event_call {
+ struct list_head list;
+ char *name;
+ char *system;
+ struct dentry *dir;
+ struct trace_event *event;
+ int enabled;
+ int (*regfunc)(void);
+ void (*unregfunc)(void);
+ int id;
+ int (*raw_init)(void);
+ int (*show_format)(struct trace_seq *s);
+ int (*define_fields)(void);
+ struct list_head fields;
+ int filter_active;
+ void *filter;
+ void *mod;
+
+#ifdef CONFIG_EVENT_PROFILE
+ atomic_t profile_count;
+ int (*profile_enable)(struct ftrace_event_call *);
+ void (*profile_disable)(struct ftrace_event_call *);
+#endif
+};
+
+#define MAX_FILTER_PRED 32
+#define MAX_FILTER_STR_VAL 128
+
+extern int init_preds(struct ftrace_event_call *call);
+extern void destroy_preds(struct ftrace_event_call *call);
+extern int filter_match_preds(struct ftrace_event_call *call, void *rec);
+extern int filter_current_check_discard(struct ftrace_event_call *call,
+ void *rec,
+ struct ring_buffer_event *event);
+
+extern int trace_define_field(struct ftrace_event_call *call, char *type,
+ char *name, int offset, int size, int is_signed);
+
+#define is_signed_type(type) (((type)(-1)) < 0)
+
+int trace_set_clr_event(const char *system, const char *event, int set);
+
+/*
+ * The double __builtin_constant_p is because gcc will give us an error
+ * if we try to allocate the static variable to fmt if it is not a
+ * constant. Even with the outer if statement optimizing out.
+ */
+#define event_trace_printk(ip, fmt, args...) \
+do { \
+ __trace_printk_check_format(fmt, ##args); \
+ tracing_record_cmdline(current); \
+ if (__builtin_constant_p(fmt)) { \
+ static const char *trace_printk_fmt \
+ __attribute__((section("__trace_printk_fmt"))) = \
+ __builtin_constant_p(fmt) ? fmt : NULL; \
+ \
+ __trace_bprintk(ip, trace_printk_fmt, ##args); \
+ } else \
+ __trace_printk(ip, fmt, ##args); \
+} while (0)
+
+#define __common_field(type, item, is_signed) \
+ ret = trace_define_field(event_call, #type, "common_" #item, \
+ offsetof(typeof(field.ent), item), \
+ sizeof(field.ent.item), is_signed); \
+ if (ret) \
+ return ret;
+
+#endif /* _LINUX_FTRACE_EVENT_H */
diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index d87247d..889bf99 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -174,6 +174,7 @@ extern struct cred init_cred;
INIT_TRACE_IRQFLAGS \
INIT_LOCKDEP \
INIT_FTRACE_GRAPH \
+ INIT_TRACE_RECURSION \
}
diff --git a/include/linux/kmemtrace.h b/include/linux/kmemtrace.h
new file mode 100644
index 0000000..b616d39
--- /dev/null
+++ b/include/linux/kmemtrace.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2008 Eduard - Gabriel Munteanu
+ *
+ * This file is released under GPL version 2.
+ */
+
+#ifndef _LINUX_KMEMTRACE_H
+#define _LINUX_KMEMTRACE_H
+
+#ifdef __KERNEL__
+
+#include <trace/events/kmem.h>
+
+#ifdef CONFIG_KMEMTRACE
+extern void kmemtrace_init(void);
+#else
+static inline void kmemtrace_init(void)
+{
+}
+#endif
+
+#endif /* __KERNEL__ */
+
+#endif /* _LINUX_KMEMTRACE_H */
+
diff --git a/include/linux/mm.h b/include/linux/mm.h
index bff1f0d..009eabd 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -19,6 +19,7 @@ struct anon_vma;
struct file_ra_state;
struct user_struct;
struct writeback_control;
+struct rlimit;
#ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */
extern unsigned long max_mapnr;
@@ -1319,8 +1320,8 @@ int vmemmap_populate_basepages(struct page *start_page,
int vmemmap_populate(struct page *start_page, unsigned long pages, int node);
void vmemmap_populate_print_last(void);
-extern void *alloc_locked_buffer(size_t size);
-extern void free_locked_buffer(void *buffer, size_t size);
-extern void release_locked_buffer(void *buffer, size_t size);
+extern int account_locked_memory(struct mm_struct *mm, struct rlimit *rlim,
+ size_t size);
+extern void refund_locked_memory(struct mm_struct *mm, size_t size);
#endif /* __KERNEL__ */
#endif /* _LINUX_MM_H */
diff --git a/include/linux/mmiotrace.h b/include/linux/mmiotrace.h
index 3d1b7bd..97491f7 100644
--- a/include/linux/mmiotrace.h
+++ b/include/linux/mmiotrace.h
@@ -30,6 +30,8 @@ extern unsigned int kmmio_count;
extern int register_kmmio_probe(struct kmmio_probe *p);
extern void unregister_kmmio_probe(struct kmmio_probe *p);
+extern int kmmio_init(void);
+extern void kmmio_cleanup(void);
#ifdef CONFIG_MMIOTRACE
/* kmmio is active by some kmmio_probes? */
diff --git a/include/linux/module.h b/include/linux/module.h
index 627ac08..a8f2c0a 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -337,6 +337,14 @@ struct module
const char **trace_bprintk_fmt_start;
unsigned int num_trace_bprintk_fmt;
#endif
+#ifdef CONFIG_EVENT_TRACING
+ struct ftrace_event_call *trace_events;
+ unsigned int num_trace_events;
+#endif
+#ifdef CONFIG_FTRACE_MCOUNT_RECORD
+ unsigned long *ftrace_callsites;
+ unsigned int num_ftrace_callsites;
+#endif
#ifdef CONFIG_MODULE_UNLOAD
/* What modules depend on me? */
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
index 67c1565..59e133d 100644
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -95,7 +95,6 @@ extern void __ptrace_link(struct task_struct *child,
struct task_struct *new_parent);
extern void __ptrace_unlink(struct task_struct *child);
extern void exit_ptrace(struct task_struct *tracer);
-extern void ptrace_fork(struct task_struct *task, unsigned long clone_flags);
#define PTRACE_MODE_READ 1
#define PTRACE_MODE_ATTACH 2
/* Returns 0 on success, -errno on denial. */
@@ -327,15 +326,6 @@ static inline void user_enable_block_step(struct task_struct *task)
#define arch_ptrace_untrace(task) do { } while (0)
#endif
-#ifndef arch_ptrace_fork
-/*
- * Do machine-specific work to initialize a new task.
- *
- * This is called from copy_process().
- */
-#define arch_ptrace_fork(child, clone_flags) do { } while (0)
-#endif
-
extern int task_current_syscall(struct task_struct *target, long *callno,
unsigned long args[6], unsigned int maxargs,
unsigned long *sp, unsigned long *pc);
diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h
index e1b7b21..8670f15 100644
--- a/include/linux/ring_buffer.h
+++ b/include/linux/ring_buffer.h
@@ -11,7 +11,7 @@ struct ring_buffer_iter;
* Don't refer to this struct directly, use functions below.
*/
struct ring_buffer_event {
- u32 type:2, len:3, time_delta:27;
+ u32 type_len:5, time_delta:27;
u32 array[];
};
@@ -24,7 +24,8 @@ struct ring_buffer_event {
* size is variable depending on how much
* padding is needed
* If time_delta is non zero:
- * everything else same as RINGBUF_TYPE_DATA
+ * array[0] holds the actual length
+ * size = 4 + length (bytes)
*
* @RINGBUF_TYPE_TIME_EXTEND: Extend the time delta
* array[0] = time delta (28 .. 59)
@@ -35,22 +36,23 @@ struct ring_buffer_event {
* array[1..2] = tv_sec
* size = 16 bytes
*
- * @RINGBUF_TYPE_DATA: Data record
- * If len is zero:
+ * <= @RINGBUF_TYPE_DATA_TYPE_LEN_MAX:
+ * Data record
+ * If type_len is zero:
* array[0] holds the actual length
* array[1..(length+3)/4] holds data
- * size = 4 + 4 + length (bytes)
+ * size = 4 + length (bytes)
* else
- * length = len << 2
+ * length = type_len << 2
* array[0..(length+3)/4-1] holds data
* size = 4 + length (bytes)
*/
enum ring_buffer_type {
+ RINGBUF_TYPE_DATA_TYPE_LEN_MAX = 28,
RINGBUF_TYPE_PADDING,
RINGBUF_TYPE_TIME_EXTEND,
/* FIXME: RINGBUF_TYPE_TIME_STAMP not implemented */
RINGBUF_TYPE_TIME_STAMP,
- RINGBUF_TYPE_DATA,
};
unsigned ring_buffer_event_length(struct ring_buffer_event *event);
@@ -68,13 +70,54 @@ ring_buffer_event_time_delta(struct ring_buffer_event *event)
return event->time_delta;
}
+/*
+ * ring_buffer_event_discard can discard any event in the ring buffer.
+ * it is up to the caller to protect against a reader from
+ * consuming it or a writer from wrapping and replacing it.
+ *
+ * No external protection is needed if this is called before
+ * the event is commited. But in that case it would be better to
+ * use ring_buffer_discard_commit.
+ *
+ * Note, if an event that has not been committed is discarded
+ * with ring_buffer_event_discard, it must still be committed.
+ */
void ring_buffer_event_discard(struct ring_buffer_event *event);
/*
+ * ring_buffer_discard_commit will remove an event that has not
+ * ben committed yet. If this is used, then ring_buffer_unlock_commit
+ * must not be called on the discarded event. This function
+ * will try to remove the event from the ring buffer completely
+ * if another event has not been written after it.
+ *
+ * Example use:
+ *
+ * if (some_condition)
+ * ring_buffer_discard_commit(buffer, event);
+ * else
+ * ring_buffer_unlock_commit(buffer, event);
+ */
+void ring_buffer_discard_commit(struct ring_buffer *buffer,
+ struct ring_buffer_event *event);
+
+/*
* size is in bytes for each per CPU buffer.
*/
struct ring_buffer *
-ring_buffer_alloc(unsigned long size, unsigned flags);
+__ring_buffer_alloc(unsigned long size, unsigned flags, struct lock_class_key *key);
+
+/*
+ * Because the ring buffer is generic, if other users of the ring buffer get
+ * traced by ftrace, it can produce lockdep warnings. We need to keep each
+ * ring buffer's lock class separate.
+ */
+#define ring_buffer_alloc(size, flags) \
+({ \
+ static struct lock_class_key __key; \
+ __ring_buffer_alloc((size), (flags), &__key); \
+})
+
void ring_buffer_free(struct ring_buffer *buffer);
int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size);
@@ -122,6 +165,8 @@ unsigned long ring_buffer_entries(struct ring_buffer *buffer);
unsigned long ring_buffer_overruns(struct ring_buffer *buffer);
unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu);
unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu);
+unsigned long ring_buffer_commit_overrun_cpu(struct ring_buffer *buffer, int cpu);
+unsigned long ring_buffer_nmi_dropped_cpu(struct ring_buffer *buffer, int cpu);
u64 ring_buffer_time_stamp(struct ring_buffer *buffer, int cpu);
void ring_buffer_normalize_time_stamp(struct ring_buffer *buffer,
@@ -137,6 +182,11 @@ void ring_buffer_free_read_page(struct ring_buffer *buffer, void *data);
int ring_buffer_read_page(struct ring_buffer *buffer, void **data_page,
size_t len, int cpu, int full);
+struct trace_seq;
+
+int ring_buffer_print_entry_header(struct trace_seq *s);
+int ring_buffer_print_page_header(struct trace_seq *s);
+
enum ring_buffer_flags {
RB_FL_OVERWRITE = 1 << 0,
};
diff --git a/include/linux/sched.h b/include/linux/sched.h
index b4c38bc..1ed4ef5 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -96,8 +96,8 @@ struct exec_domain;
struct futex_pi_state;
struct robust_list_head;
struct bio;
-struct bts_tracer;
struct fs_struct;
+struct bts_context;
/*
* List of flags we want to share for kernel threads,
@@ -1209,18 +1209,11 @@ struct task_struct {
struct list_head ptraced;
struct list_head ptrace_entry;
-#ifdef CONFIG_X86_PTRACE_BTS
/*
* This is the tracer handle for the ptrace BTS extension.
* This field actually belongs to the ptracer task.
*/
- struct bts_tracer *bts;
- /*
- * The buffer to hold the BTS data.
- */
- void *bts_buffer;
- size_t bts_size;
-#endif /* CONFIG_X86_PTRACE_BTS */
+ struct bts_context *bts;
/* PID/PID hash table linkage. */
struct pid_link pids[PIDTYPE_MAX];
@@ -1428,7 +1421,9 @@ struct task_struct {
#ifdef CONFIG_TRACING
/* state flags for use by tracers */
unsigned long trace;
-#endif
+ /* bitmask of trace recursion */
+ unsigned long trace_recursion;
+#endif /* CONFIG_TRACING */
};
/* Future-safe accessor for struct task_struct's cpus_allowed. */
@@ -2001,8 +1996,10 @@ extern void set_task_comm(struct task_struct *tsk, char *from);
extern char *get_task_comm(char *to, struct task_struct *tsk);
#ifdef CONFIG_SMP
+extern void wait_task_context_switch(struct task_struct *p);
extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
#else
+static inline void wait_task_context_switch(struct task_struct *p) {}
static inline unsigned long wait_task_inactive(struct task_struct *p,
long match_state)
{
diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h
index 5ac9b0b..713f841 100644
--- a/include/linux/slab_def.h
+++ b/include/linux/slab_def.h
@@ -14,7 +14,7 @@
#include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
#include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */
#include <linux/compiler.h>
-#include <trace/kmemtrace.h>
+#include <linux/kmemtrace.h>
/* Size description struct for general caches. */
struct cache_sizes {
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 5046f90..be5d40c 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -10,7 +10,7 @@
#include <linux/gfp.h>
#include <linux/workqueue.h>
#include <linux/kobject.h>
-#include <trace/kmemtrace.h>
+#include <linux/kmemtrace.h>
enum stat_item {
ALLOC_FASTPATH, /* Allocation from cpu slab */
diff --git a/include/linux/trace_seq.h b/include/linux/trace_seq.h
new file mode 100644
index 0000000..c68bccb
--- /dev/null
+++ b/include/linux/trace_seq.h
@@ -0,0 +1,92 @@
+#ifndef _LINUX_TRACE_SEQ_H
+#define _LINUX_TRACE_SEQ_H
+
+#include <linux/fs.h>
+
+/*
+ * Trace sequences are used to allow a function to call several other functions
+ * to create a string of data to use (up to a max of PAGE_SIZE.
+ */
+
+struct trace_seq {
+ unsigned char buffer[PAGE_SIZE];
+ unsigned int len;
+ unsigned int readpos;
+};
+
+static inline void
+trace_seq_init(struct trace_seq *s)
+{
+ s->len = 0;
+ s->readpos = 0;
+}
+
+/*
+ * Currently only defined when tracing is enabled.
+ */
+#ifdef CONFIG_TRACING
+extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
+ __attribute__ ((format (printf, 2, 3)));
+extern int trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
+ __attribute__ ((format (printf, 2, 0)));
+extern int
+trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary);
+extern void trace_print_seq(struct seq_file *m, struct trace_seq *s);
+extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
+ size_t cnt);
+extern int trace_seq_puts(struct trace_seq *s, const char *str);
+extern int trace_seq_putc(struct trace_seq *s, unsigned char c);
+extern int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len);
+extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
+ size_t len);
+extern void *trace_seq_reserve(struct trace_seq *s, size_t len);
+extern int trace_seq_path(struct trace_seq *s, struct path *path);
+
+#else /* CONFIG_TRACING */
+static inline int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
+{
+ return 0;
+}
+static inline int
+trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
+{
+ return 0;
+}
+
+static inline void trace_print_seq(struct seq_file *m, struct trace_seq *s)
+{
+}
+static inline ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
+ size_t cnt)
+{
+ return 0;
+}
+static inline int trace_seq_puts(struct trace_seq *s, const char *str)
+{
+ return 0;
+}
+static inline int trace_seq_putc(struct trace_seq *s, unsigned char c)
+{
+ return 0;
+}
+static inline int
+trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
+{
+ return 0;
+}
+static inline int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
+ size_t len)
+{
+ return 0;
+}
+static inline void *trace_seq_reserve(struct trace_seq *s, size_t len)
+{
+ return NULL;
+}
+static inline int trace_seq_path(struct trace_seq *s, struct path *path)
+{
+ return 0;
+}
+#endif /* CONFIG_TRACING */
+
+#endif /* _LINUX_TRACE_SEQ_H */
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index d35a7ee..14df7e6 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -31,6 +31,8 @@ struct tracepoint {
* Keep in sync with vmlinux.lds.h.
*/
+#ifndef DECLARE_TRACE
+
#define TP_PROTO(args...) args
#define TP_ARGS(args...) args
@@ -114,6 +116,7 @@ static inline void tracepoint_update_probe_range(struct tracepoint *begin,
struct tracepoint *end)
{ }
#endif /* CONFIG_TRACEPOINTS */
+#endif /* DECLARE_TRACE */
/*
* Connect a probe to a tracepoint.
@@ -154,10 +157,8 @@ static inline void tracepoint_synchronize_unregister(void)
}
#define PARAMS(args...) args
-#define TRACE_FORMAT(name, proto, args, fmt) \
- DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
-
+#ifndef TRACE_EVENT
/*
* For use with the TRACE_EVENT macro:
*
@@ -262,5 +263,6 @@ static inline void tracepoint_synchronize_unregister(void)
#define TRACE_EVENT(name, proto, args, struct, assign, print) \
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
+#endif
#endif
diff --git a/include/trace/block.h b/include/trace/block.h
deleted file mode 100644
index 25b7068..0000000
--- a/include/trace/block.h
+++ /dev/null
@@ -1,76 +0,0 @@
-#ifndef _TRACE_BLOCK_H
-#define _TRACE_BLOCK_H
-
-#include <linux/blkdev.h>
-#include <linux/tracepoint.h>
-
-DECLARE_TRACE(block_rq_abort,
- TP_PROTO(struct request_queue *q, struct request *rq),
- TP_ARGS(q, rq));
-
-DECLARE_TRACE(block_rq_insert,
- TP_PROTO(struct request_queue *q, struct request *rq),
- TP_ARGS(q, rq));
-
-DECLARE_TRACE(block_rq_issue,
- TP_PROTO(struct request_queue *q, struct request *rq),
- TP_ARGS(q, rq));
-
-DECLARE_TRACE(block_rq_requeue,
- TP_PROTO(struct request_queue *q, struct request *rq),
- TP_ARGS(q, rq));
-
-DECLARE_TRACE(block_rq_complete,
- TP_PROTO(struct request_queue *q, struct request *rq),
- TP_ARGS(q, rq));
-
-DECLARE_TRACE(block_bio_bounce,
- TP_PROTO(struct request_queue *q, struct bio *bio),
- TP_ARGS(q, bio));
-
-DECLARE_TRACE(block_bio_complete,
- TP_PROTO(struct request_queue *q, struct bio *bio),
- TP_ARGS(q, bio));
-
-DECLARE_TRACE(block_bio_backmerge,
- TP_PROTO(struct request_queue *q, struct bio *bio),
- TP_ARGS(q, bio));
-
-DECLARE_TRACE(block_bio_frontmerge,
- TP_PROTO(struct request_queue *q, struct bio *bio),
- TP_ARGS(q, bio));
-
-DECLARE_TRACE(block_bio_queue,
- TP_PROTO(struct request_queue *q, struct bio *bio),
- TP_ARGS(q, bio));
-
-DECLARE_TRACE(block_getrq,
- TP_PROTO(struct request_queue *q, struct bio *bio, int rw),
- TP_ARGS(q, bio, rw));
-
-DECLARE_TRACE(block_sleeprq,
- TP_PROTO(struct request_queue *q, struct bio *bio, int rw),
- TP_ARGS(q, bio, rw));
-
-DECLARE_TRACE(block_plug,
- TP_PROTO(struct request_queue *q),
- TP_ARGS(q));
-
-DECLARE_TRACE(block_unplug_timer,
- TP_PROTO(struct request_queue *q),
- TP_ARGS(q));
-
-DECLARE_TRACE(block_unplug_io,
- TP_PROTO(struct request_queue *q),
- TP_ARGS(q));
-
-DECLARE_TRACE(block_split,
- TP_PROTO(struct request_queue *q, struct bio *bio, unsigned int pdu),
- TP_ARGS(q, bio, pdu));
-
-DECLARE_TRACE(block_remap,
- TP_PROTO(struct request_queue *q, struct bio *bio, dev_t dev,
- sector_t from, sector_t to),
- TP_ARGS(q, bio, dev, from, to));
-
-#endif
diff --git a/include/trace/define_trace.h b/include/trace/define_trace.h
new file mode 100644
index 0000000..f7a7ae1
--- /dev/null
+++ b/include/trace/define_trace.h
@@ -0,0 +1,75 @@
+/*
+ * Trace files that want to automate creationg of all tracepoints defined
+ * in their file should include this file. The following are macros that the
+ * trace file may define:
+ *
+ * TRACE_SYSTEM defines the system the tracepoint is for
+ *
+ * TRACE_INCLUDE_FILE if the file name is something other than TRACE_SYSTEM.h
+ * This macro may be defined to tell define_trace.h what file to include.
+ * Note, leave off the ".h".
+ *
+ * TRACE_INCLUDE_PATH if the path is something other than core kernel include/trace
+ * then this macro can define the path to use. Note, the path is relative to
+ * define_trace.h, not the file including it. Full path names for out of tree
+ * modules must be used.
+ */
+
+#ifdef CREATE_TRACE_POINTS
+
+/* Prevent recursion */
+#undef CREATE_TRACE_POINTS
+
+#include <linux/stringify.h>
+
+#undef TRACE_EVENT
+#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
+ DEFINE_TRACE(name)
+
+#undef DECLARE_TRACE
+#define DECLARE_TRACE(name, proto, args) \
+ DEFINE_TRACE(name)
+
+#undef TRACE_INCLUDE
+#undef __TRACE_INCLUDE
+
+#ifndef TRACE_INCLUDE_FILE
+# define TRACE_INCLUDE_FILE TRACE_SYSTEM
+# define UNDEF_TRACE_INCLUDE_FILE
+#endif
+
+#ifndef TRACE_INCLUDE_PATH
+# define __TRACE_INCLUDE(system) <trace/events/system.h>
+# define UNDEF_TRACE_INCLUDE_PATH
+#else
+# define __TRACE_INCLUDE(system) __stringify(TRACE_INCLUDE_PATH/system.h)
+#endif
+
+# define TRACE_INCLUDE(system) __TRACE_INCLUDE(system)
+
+/* Let the trace headers be reread */
+#define TRACE_HEADER_MULTI_READ
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+#ifdef CONFIG_EVENT_TRACING
+#include <trace/ftrace.h>
+#endif
+
+#undef TRACE_HEADER_MULTI_READ
+
+/* Only undef what we defined in this file */
+#ifdef UNDEF_TRACE_INCLUDE_FILE
+# undef TRACE_INCLUDE_FILE
+# undef UNDEF_TRACE_INCLUDE_FILE
+#endif
+
+#ifdef UNDEF_TRACE_INCLUDE_PATH
+# undef TRACE_INCLUDE_PATH
+# undef UNDEF_TRACE_INCLUDE_PATH
+#endif
+
+/* We may be processing more files */
+#define CREATE_TRACE_POINTS
+
+#endif /* CREATE_TRACE_POINTS */
diff --git a/include/trace/events/block.h b/include/trace/events/block.h
new file mode 100644
index 0000000..53effd4
--- /dev/null
+++ b/include/trace/events/block.h
@@ -0,0 +1,498 @@
+#if !defined(_TRACE_BLOCK_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_BLOCK_H
+
+#include <linux/blktrace_api.h>
+#include <linux/blkdev.h>
+#include <linux/tracepoint.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM block
+
+TRACE_EVENT(block_rq_abort,
+
+ TP_PROTO(struct request_queue *q, struct request *rq),
+
+ TP_ARGS(q, rq),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( sector_t, sector )
+ __field( unsigned int, nr_sector )
+ __field( int, errors )
+ __array( char, rwbs, 6 )
+ __dynamic_array( char, cmd, blk_cmd_buf_len(rq) )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = rq->rq_disk ? disk_devt(rq->rq_disk) : 0;
+ __entry->sector = blk_pc_request(rq) ? 0 : rq->hard_sector;
+ __entry->nr_sector = blk_pc_request(rq) ?
+ 0 : rq->hard_nr_sectors;
+ __entry->errors = rq->errors;
+
+ blk_fill_rwbs_rq(__entry->rwbs, rq);
+ blk_dump_cmd(__get_str(cmd), rq);
+ ),
+
+ TP_printk("%d,%d %s (%s) %llu + %u [%d]",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ __entry->rwbs, __get_str(cmd),
+ (unsigned long long)__entry->sector,
+ __entry->nr_sector, __entry->errors)
+);
+
+TRACE_EVENT(block_rq_insert,
+
+ TP_PROTO(struct request_queue *q, struct request *rq),
+
+ TP_ARGS(q, rq),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( sector_t, sector )
+ __field( unsigned int, nr_sector )
+ __field( unsigned int, bytes )
+ __array( char, rwbs, 6 )
+ __array( char, comm, TASK_COMM_LEN )
+ __dynamic_array( char, cmd, blk_cmd_buf_len(rq) )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = rq->rq_disk ? disk_devt(rq->rq_disk) : 0;
+ __entry->sector = blk_pc_request(rq) ? 0 : rq->hard_sector;
+ __entry->nr_sector = blk_pc_request(rq) ?
+ 0 : rq->hard_nr_sectors;
+ __entry->bytes = blk_pc_request(rq) ? rq->data_len : 0;
+
+ blk_fill_rwbs_rq(__entry->rwbs, rq);
+ blk_dump_cmd(__get_str(cmd), rq);
+ memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
+ ),
+
+ TP_printk("%d,%d %s %u (%s) %llu + %u [%s]",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ __entry->rwbs, __entry->bytes, __get_str(cmd),
+ (unsigned long long)__entry->sector,
+ __entry->nr_sector, __entry->comm)
+);
+
+TRACE_EVENT(block_rq_issue,
+
+ TP_PROTO(struct request_queue *q, struct request *rq),
+
+ TP_ARGS(q, rq),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( sector_t, sector )
+ __field( unsigned int, nr_sector )
+ __field( unsigned int, bytes )
+ __array( char, rwbs, 6 )
+ __array( char, comm, TASK_COMM_LEN )
+ __dynamic_array( char, cmd, blk_cmd_buf_len(rq) )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = rq->rq_disk ? disk_devt(rq->rq_disk) : 0;
+ __entry->sector = blk_pc_request(rq) ? 0 : rq->hard_sector;
+ __entry->nr_sector = blk_pc_request(rq) ?
+ 0 : rq->hard_nr_sectors;
+ __entry->bytes = blk_pc_request(rq) ? rq->data_len : 0;
+
+ blk_fill_rwbs_rq(__entry->rwbs, rq);
+ blk_dump_cmd(__get_str(cmd), rq);
+ memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
+ ),
+
+ TP_printk("%d,%d %s %u (%s) %llu + %u [%s]",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ __entry->rwbs, __entry->bytes, __get_str(cmd),
+ (unsigned long long)__entry->sector,
+ __entry->nr_sector, __entry->comm)
+);
+
+TRACE_EVENT(block_rq_requeue,
+
+ TP_PROTO(struct request_queue *q, struct request *rq),
+
+ TP_ARGS(q, rq),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( sector_t, sector )
+ __field( unsigned int, nr_sector )
+ __field( int, errors )
+ __array( char, rwbs, 6 )
+ __dynamic_array( char, cmd, blk_cmd_buf_len(rq) )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = rq->rq_disk ? disk_devt(rq->rq_disk) : 0;
+ __entry->sector = blk_pc_request(rq) ? 0 : rq->hard_sector;
+ __entry->nr_sector = blk_pc_request(rq) ?
+ 0 : rq->hard_nr_sectors;
+ __entry->errors = rq->errors;
+
+ blk_fill_rwbs_rq(__entry->rwbs, rq);
+ blk_dump_cmd(__get_str(cmd), rq);
+ ),
+
+ TP_printk("%d,%d %s (%s) %llu + %u [%d]",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ __entry->rwbs, __get_str(cmd),
+ (unsigned long long)__entry->sector,
+ __entry->nr_sector, __entry->errors)
+);
+
+TRACE_EVENT(block_rq_complete,
+
+ TP_PROTO(struct request_queue *q, struct request *rq),
+
+ TP_ARGS(q, rq),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( sector_t, sector )
+ __field( unsigned int, nr_sector )
+ __field( int, errors )
+ __array( char, rwbs, 6 )
+ __dynamic_array( char, cmd, blk_cmd_buf_len(rq) )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = rq->rq_disk ? disk_devt(rq->rq_disk) : 0;
+ __entry->sector = blk_pc_request(rq) ? 0 : rq->hard_sector;
+ __entry->nr_sector = blk_pc_request(rq) ?
+ 0 : rq->hard_nr_sectors;
+ __entry->errors = rq->errors;
+
+ blk_fill_rwbs_rq(__entry->rwbs, rq);
+ blk_dump_cmd(__get_str(cmd), rq);
+ ),
+
+ TP_printk("%d,%d %s (%s) %llu + %u [%d]",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ __entry->rwbs, __get_str(cmd),
+ (unsigned long long)__entry->sector,
+ __entry->nr_sector, __entry->errors)
+);
+TRACE_EVENT(block_bio_bounce,
+
+ TP_PROTO(struct request_queue *q, struct bio *bio),
+
+ TP_ARGS(q, bio),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( sector_t, sector )
+ __field( unsigned int, nr_sector )
+ __array( char, rwbs, 6 )
+ __array( char, comm, TASK_COMM_LEN )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = bio->bi_bdev->bd_dev;
+ __entry->sector = bio->bi_sector;
+ __entry->nr_sector = bio->bi_size >> 9;
+ blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_size);
+ memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
+ ),
+
+ TP_printk("%d,%d %s %llu + %u [%s]",
+ MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
+ (unsigned long long)__entry->sector,
+ __entry->nr_sector, __entry->comm)
+);
+
+TRACE_EVENT(block_bio_complete,
+
+ TP_PROTO(struct request_queue *q, struct bio *bio),
+
+ TP_ARGS(q, bio),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( sector_t, sector )
+ __field( unsigned, nr_sector )
+ __field( int, error )
+ __array( char, rwbs, 6 )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = bio->bi_bdev->bd_dev;
+ __entry->sector = bio->bi_sector;
+ __entry->nr_sector = bio->bi_size >> 9;
+ blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_size);
+ ),
+
+ TP_printk("%d,%d %s %llu + %u [%d]",
+ MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
+ (unsigned long long)__entry->sector,
+ __entry->nr_sector, __entry->error)
+);
+
+TRACE_EVENT(block_bio_backmerge,
+
+ TP_PROTO(struct request_queue *q, struct bio *bio),
+
+ TP_ARGS(q, bio),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( sector_t, sector )
+ __field( unsigned int, nr_sector )
+ __array( char, rwbs, 6 )
+ __array( char, comm, TASK_COMM_LEN )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = bio->bi_bdev->bd_dev;
+ __entry->sector = bio->bi_sector;
+ __entry->nr_sector = bio->bi_size >> 9;
+ blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_size);
+ memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
+ ),
+
+ TP_printk("%d,%d %s %llu + %u [%s]",
+ MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
+ (unsigned long long)__entry->sector,
+ __entry->nr_sector, __entry->comm)
+);
+
+TRACE_EVENT(block_bio_frontmerge,
+
+ TP_PROTO(struct request_queue *q, struct bio *bio),
+
+ TP_ARGS(q, bio),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( sector_t, sector )
+ __field( unsigned, nr_sector )
+ __array( char, rwbs, 6 )
+ __array( char, comm, TASK_COMM_LEN )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = bio->bi_bdev->bd_dev;
+ __entry->sector = bio->bi_sector;
+ __entry->nr_sector = bio->bi_size >> 9;
+ blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_size);
+ memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
+ ),
+
+ TP_printk("%d,%d %s %llu + %u [%s]",
+ MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
+ (unsigned long long)__entry->sector,
+ __entry->nr_sector, __entry->comm)
+);
+
+TRACE_EVENT(block_bio_queue,
+
+ TP_PROTO(struct request_queue *q, struct bio *bio),
+
+ TP_ARGS(q, bio),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( sector_t, sector )
+ __field( unsigned int, nr_sector )
+ __array( char, rwbs, 6 )
+ __array( char, comm, TASK_COMM_LEN )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = bio->bi_bdev->bd_dev;
+ __entry->sector = bio->bi_sector;
+ __entry->nr_sector = bio->bi_size >> 9;
+ blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_size);
+ memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
+ ),
+
+ TP_printk("%d,%d %s %llu + %u [%s]",
+ MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
+ (unsigned long long)__entry->sector,
+ __entry->nr_sector, __entry->comm)
+);
+
+TRACE_EVENT(block_getrq,
+
+ TP_PROTO(struct request_queue *q, struct bio *bio, int rw),
+
+ TP_ARGS(q, bio, rw),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( sector_t, sector )
+ __field( unsigned int, nr_sector )
+ __array( char, rwbs, 6 )
+ __array( char, comm, TASK_COMM_LEN )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = bio ? bio->bi_bdev->bd_dev : 0;
+ __entry->sector = bio ? bio->bi_sector : 0;
+ __entry->nr_sector = bio ? bio->bi_size >> 9 : 0;
+ blk_fill_rwbs(__entry->rwbs,
+ bio ? bio->bi_rw : 0, __entry->nr_sector);
+ memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
+ ),
+
+ TP_printk("%d,%d %s %llu + %u [%s]",
+ MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
+ (unsigned long long)__entry->sector,
+ __entry->nr_sector, __entry->comm)
+);
+
+TRACE_EVENT(block_sleeprq,
+
+ TP_PROTO(struct request_queue *q, struct bio *bio, int rw),
+
+ TP_ARGS(q, bio, rw),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( sector_t, sector )
+ __field( unsigned int, nr_sector )
+ __array( char, rwbs, 6 )
+ __array( char, comm, TASK_COMM_LEN )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = bio ? bio->bi_bdev->bd_dev : 0;
+ __entry->sector = bio ? bio->bi_sector : 0;
+ __entry->nr_sector = bio ? bio->bi_size >> 9 : 0;
+ blk_fill_rwbs(__entry->rwbs,
+ bio ? bio->bi_rw : 0, __entry->nr_sector);
+ memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
+ ),
+
+ TP_printk("%d,%d %s %llu + %u [%s]",
+ MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
+ (unsigned long long)__entry->sector,
+ __entry->nr_sector, __entry->comm)
+);
+
+TRACE_EVENT(block_plug,
+
+ TP_PROTO(struct request_queue *q),
+
+ TP_ARGS(q),
+
+ TP_STRUCT__entry(
+ __array( char, comm, TASK_COMM_LEN )
+ ),
+
+ TP_fast_assign(
+ memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
+ ),
+
+ TP_printk("[%s]", __entry->comm)
+);
+
+TRACE_EVENT(block_unplug_timer,
+
+ TP_PROTO(struct request_queue *q),
+
+ TP_ARGS(q),
+
+ TP_STRUCT__entry(
+ __field( int, nr_rq )
+ __array( char, comm, TASK_COMM_LEN )
+ ),
+
+ TP_fast_assign(
+ __entry->nr_rq = q->rq.count[READ] + q->rq.count[WRITE];
+ memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
+ ),
+
+ TP_printk("[%s] %d", __entry->comm, __entry->nr_rq)
+);
+
+TRACE_EVENT(block_unplug_io,
+
+ TP_PROTO(struct request_queue *q),
+
+ TP_ARGS(q),
+
+ TP_STRUCT__entry(
+ __field( int, nr_rq )
+ __array( char, comm, TASK_COMM_LEN )
+ ),
+
+ TP_fast_assign(
+ __entry->nr_rq = q->rq.count[READ] + q->rq.count[WRITE];
+ memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
+ ),
+
+ TP_printk("[%s] %d", __entry->comm, __entry->nr_rq)
+);
+
+TRACE_EVENT(block_split,
+
+ TP_PROTO(struct request_queue *q, struct bio *bio,
+ unsigned int new_sector),
+
+ TP_ARGS(q, bio, new_sector),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( sector_t, sector )
+ __field( sector_t, new_sector )
+ __array( char, rwbs, 6 )
+ __array( char, comm, TASK_COMM_LEN )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = bio->bi_bdev->bd_dev;
+ __entry->sector = bio->bi_sector;
+ __entry->new_sector = new_sector;
+ blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_size);
+ memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
+ ),
+
+ TP_printk("%d,%d %s %llu / %llu [%s]",
+ MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
+ (unsigned long long)__entry->sector,
+ (unsigned long long)__entry->new_sector,
+ __entry->comm)
+);
+
+TRACE_EVENT(block_remap,
+
+ TP_PROTO(struct request_queue *q, struct bio *bio, dev_t dev,
+ sector_t from),
+
+ TP_ARGS(q, bio, dev, from),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( sector_t, sector )
+ __field( unsigned int, nr_sector )
+ __field( dev_t, old_dev )
+ __field( sector_t, old_sector )
+ __array( char, rwbs, 6 )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = bio->bi_bdev->bd_dev;
+ __entry->sector = bio->bi_sector;
+ __entry->nr_sector = bio->bi_size >> 9;
+ __entry->old_dev = dev;
+ __entry->old_sector = from;
+ blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_size);
+ ),
+
+ TP_printk("%d,%d %s %llu + %u <- (%d,%d) %llu",
+ MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
+ (unsigned long long)__entry->sector,
+ __entry->nr_sector,
+ MAJOR(__entry->old_dev), MINOR(__entry->old_dev),
+ (unsigned long long)__entry->old_sector)
+);
+
+#endif /* _TRACE_BLOCK_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
+
diff --git a/include/trace/events/irq.h b/include/trace/events/irq.h
new file mode 100644
index 0000000..b0c7ede
--- /dev/null
+++ b/include/trace/events/irq.h
@@ -0,0 +1,145 @@
+#if !defined(_TRACE_IRQ_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_IRQ_H
+
+#include <linux/tracepoint.h>
+#include <linux/interrupt.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM irq
+
+#define softirq_name(sirq) { sirq##_SOFTIRQ, #sirq }
+#define show_softirq_name(val) \
+ __print_symbolic(val, \
+ softirq_name(HI), \
+ softirq_name(TIMER), \
+ softirq_name(NET_TX), \
+ softirq_name(NET_RX), \
+ softirq_name(BLOCK), \
+ softirq_name(TASKLET), \
+ softirq_name(SCHED), \
+ softirq_name(HRTIMER), \
+ softirq_name(RCU))
+
+/**
+ * irq_handler_entry - called immediately before the irq action handler
+ * @irq: irq number
+ * @action: pointer to struct irqaction
+ *
+ * The struct irqaction pointed to by @action contains various
+ * information about the handler, including the device name,
+ * @action->name, and the device id, @action->dev_id. When used in
+ * conjunction with the irq_handler_exit tracepoint, we can figure
+ * out irq handler latencies.
+ */
+TRACE_EVENT(irq_handler_entry,
+
+ TP_PROTO(int irq, struct irqaction *action),
+
+ TP_ARGS(irq, action),
+
+ TP_STRUCT__entry(
+ __field( int, irq )
+ __string( name, action->name )
+ ),
+
+ TP_fast_assign(
+ __entry->irq = irq;
+ __assign_str(name, action->name);
+ ),
+
+ TP_printk("irq=%d handler=%s", __entry->irq, __get_str(name))
+);
+
+/**
+ * irq_handler_exit - called immediately after the irq action handler returns
+ * @irq: irq number
+ * @action: pointer to struct irqaction
+ * @ret: return value
+ *
+ * If the @ret value is set to IRQ_HANDLED, then we know that the corresponding
+ * @action->handler scuccessully handled this irq. Otherwise, the irq might be
+ * a shared irq line, or the irq was not handled successfully. Can be used in
+ * conjunction with the irq_handler_entry to understand irq handler latencies.
+ */
+TRACE_EVENT(irq_handler_exit,
+
+ TP_PROTO(int irq, struct irqaction *action, int ret),
+
+ TP_ARGS(irq, action, ret),
+
+ TP_STRUCT__entry(
+ __field( int, irq )
+ __field( int, ret )
+ ),
+
+ TP_fast_assign(
+ __entry->irq = irq;
+ __entry->ret = ret;
+ ),
+
+ TP_printk("irq=%d return=%s",
+ __entry->irq, __entry->ret ? "handled" : "unhandled")
+);
+
+/**
+ * softirq_entry - called immediately before the softirq handler
+ * @h: pointer to struct softirq_action
+ * @vec: pointer to first struct softirq_action in softirq_vec array
+ *
+ * The @h parameter, contains a pointer to the struct softirq_action
+ * which has a pointer to the action handler that is called. By subtracting
+ * the @vec pointer from the @h pointer, we can determine the softirq
+ * number. Also, when used in combination with the softirq_exit tracepoint
+ * we can determine the softirq latency.
+ */
+TRACE_EVENT(softirq_entry,
+
+ TP_PROTO(struct softirq_action *h, struct softirq_action *vec),
+
+ TP_ARGS(h, vec),
+
+ TP_STRUCT__entry(
+ __field( int, vec )
+ ),
+
+ TP_fast_assign(
+ __entry->vec = (int)(h - vec);
+ ),
+
+ TP_printk("softirq=%d action=%s", __entry->vec,
+ show_softirq_name(__entry->vec))
+);
+
+/**
+ * softirq_exit - called immediately after the softirq handler returns
+ * @h: pointer to struct softirq_action
+ * @vec: pointer to first struct softirq_action in softirq_vec array
+ *
+ * The @h parameter contains a pointer to the struct softirq_action
+ * that has handled the softirq. By subtracting the @vec pointer from
+ * the @h pointer, we can determine the softirq number. Also, when used in
+ * combination with the softirq_entry tracepoint we can determine the softirq
+ * latency.
+ */
+TRACE_EVENT(softirq_exit,
+
+ TP_PROTO(struct softirq_action *h, struct softirq_action *vec),
+
+ TP_ARGS(h, vec),
+
+ TP_STRUCT__entry(
+ __field( int, vec )
+ ),
+
+ TP_fast_assign(
+ __entry->vec = (int)(h - vec);
+ ),
+
+ TP_printk("softirq=%d action=%s", __entry->vec,
+ show_softirq_name(__entry->vec))
+);
+
+#endif /* _TRACE_IRQ_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/include/trace/events/kmem.h b/include/trace/events/kmem.h
new file mode 100644
index 0000000..9baba50
--- /dev/null
+++ b/include/trace/events/kmem.h
@@ -0,0 +1,231 @@
+#if !defined(_TRACE_KMEM_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_KMEM_H
+
+#include <linux/types.h>
+#include <linux/tracepoint.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM kmem
+
+/*
+ * The order of these masks is important. Matching masks will be seen
+ * first and the left over flags will end up showing by themselves.
+ *
+ * For example, if we have GFP_KERNEL before GFP_USER we wil get:
+ *
+ * GFP_KERNEL|GFP_HARDWALL
+ *
+ * Thus most bits set go first.
+ */
+#define show_gfp_flags(flags) \
+ (flags) ? __print_flags(flags, "|", \
+ {(unsigned long)GFP_HIGHUSER_MOVABLE, "GFP_HIGHUSER_MOVABLE"}, \
+ {(unsigned long)GFP_HIGHUSER, "GFP_HIGHUSER"}, \
+ {(unsigned long)GFP_USER, "GFP_USER"}, \
+ {(unsigned long)GFP_TEMPORARY, "GFP_TEMPORARY"}, \
+ {(unsigned long)GFP_KERNEL, "GFP_KERNEL"}, \
+ {(unsigned long)GFP_NOFS, "GFP_NOFS"}, \
+ {(unsigned long)GFP_ATOMIC, "GFP_ATOMIC"}, \
+ {(unsigned long)GFP_NOIO, "GFP_NOIO"}, \
+ {(unsigned long)__GFP_HIGH, "GFP_HIGH"}, \
+ {(unsigned long)__GFP_WAIT, "GFP_WAIT"}, \
+ {(unsigned long)__GFP_IO, "GFP_IO"}, \
+ {(unsigned long)__GFP_COLD, "GFP_COLD"}, \
+ {(unsigned long)__GFP_NOWARN, "GFP_NOWARN"}, \
+ {(unsigned long)__GFP_REPEAT, "GFP_REPEAT"}, \
+ {(unsigned long)__GFP_NOFAIL, "GFP_NOFAIL"}, \
+ {(unsigned long)__GFP_NORETRY, "GFP_NORETRY"}, \
+ {(unsigned long)__GFP_COMP, "GFP_COMP"}, \
+ {(unsigned long)__GFP_ZERO, "GFP_ZERO"}, \
+ {(unsigned long)__GFP_NOMEMALLOC, "GFP_NOMEMALLOC"}, \
+ {(unsigned long)__GFP_HARDWALL, "GFP_HARDWALL"}, \
+ {(unsigned long)__GFP_THISNODE, "GFP_THISNODE"}, \
+ {(unsigned long)__GFP_RECLAIMABLE, "GFP_RECLAIMABLE"}, \
+ {(unsigned long)__GFP_MOVABLE, "GFP_MOVABLE"} \
+ ) : "GFP_NOWAIT"
+
+TRACE_EVENT(kmalloc,
+
+ TP_PROTO(unsigned long call_site,
+ const void *ptr,
+ size_t bytes_req,
+ size_t bytes_alloc,
+ gfp_t gfp_flags),
+
+ TP_ARGS(call_site, ptr, bytes_req, bytes_alloc, gfp_flags),
+
+ TP_STRUCT__entry(
+ __field( unsigned long, call_site )
+ __field( const void *, ptr )
+ __field( size_t, bytes_req )
+ __field( size_t, bytes_alloc )
+ __field( gfp_t, gfp_flags )
+ ),
+
+ TP_fast_assign(
+ __entry->call_site = call_site;
+ __entry->ptr = ptr;
+ __entry->bytes_req = bytes_req;
+ __entry->bytes_alloc = bytes_alloc;
+ __entry->gfp_flags = gfp_flags;
+ ),
+
+ TP_printk("call_site=%lx ptr=%p bytes_req=%zu bytes_alloc=%zu gfp_flags=%s",
+ __entry->call_site,
+ __entry->ptr,
+ __entry->bytes_req,
+ __entry->bytes_alloc,
+ show_gfp_flags(__entry->gfp_flags))
+);
+
+TRACE_EVENT(kmem_cache_alloc,
+
+ TP_PROTO(unsigned long call_site,
+ const void *ptr,
+ size_t bytes_req,
+ size_t bytes_alloc,
+ gfp_t gfp_flags),
+
+ TP_ARGS(call_site, ptr, bytes_req, bytes_alloc, gfp_flags),
+
+ TP_STRUCT__entry(
+ __field( unsigned long, call_site )
+ __field( const void *, ptr )
+ __field( size_t, bytes_req )
+ __field( size_t, bytes_alloc )
+ __field( gfp_t, gfp_flags )
+ ),
+
+ TP_fast_assign(
+ __entry->call_site = call_site;
+ __entry->ptr = ptr;
+ __entry->bytes_req = bytes_req;
+ __entry->bytes_alloc = bytes_alloc;
+ __entry->gfp_flags = gfp_flags;
+ ),
+
+ TP_printk("call_site=%lx ptr=%p bytes_req=%zu bytes_alloc=%zu gfp_flags=%s",
+ __entry->call_site,
+ __entry->ptr,
+ __entry->bytes_req,
+ __entry->bytes_alloc,
+ show_gfp_flags(__entry->gfp_flags))
+);
+
+TRACE_EVENT(kmalloc_node,
+
+ TP_PROTO(unsigned long call_site,
+ const void *ptr,
+ size_t bytes_req,
+ size_t bytes_alloc,
+ gfp_t gfp_flags,
+ int node),
+
+ TP_ARGS(call_site, ptr, bytes_req, bytes_alloc, gfp_flags, node),
+
+ TP_STRUCT__entry(
+ __field( unsigned long, call_site )
+ __field( const void *, ptr )
+ __field( size_t, bytes_req )
+ __field( size_t, bytes_alloc )
+ __field( gfp_t, gfp_flags )
+ __field( int, node )
+ ),
+
+ TP_fast_assign(
+ __entry->call_site = call_site;
+ __entry->ptr = ptr;
+ __entry->bytes_req = bytes_req;
+ __entry->bytes_alloc = bytes_alloc;
+ __entry->gfp_flags = gfp_flags;
+ __entry->node = node;
+ ),
+
+ TP_printk("call_site=%lx ptr=%p bytes_req=%zu bytes_alloc=%zu gfp_flags=%s node=%d",
+ __entry->call_site,
+ __entry->ptr,
+ __entry->bytes_req,
+ __entry->bytes_alloc,
+ show_gfp_flags(__entry->gfp_flags),
+ __entry->node)
+);
+
+TRACE_EVENT(kmem_cache_alloc_node,
+
+ TP_PROTO(unsigned long call_site,
+ const void *ptr,
+ size_t bytes_req,
+ size_t bytes_alloc,
+ gfp_t gfp_flags,
+ int node),
+
+ TP_ARGS(call_site, ptr, bytes_req, bytes_alloc, gfp_flags, node),
+
+ TP_STRUCT__entry(
+ __field( unsigned long, call_site )
+ __field( const void *, ptr )
+ __field( size_t, bytes_req )
+ __field( size_t, bytes_alloc )
+ __field( gfp_t, gfp_flags )
+ __field( int, node )
+ ),
+
+ TP_fast_assign(
+ __entry->call_site = call_site;
+ __entry->ptr = ptr;
+ __entry->bytes_req = bytes_req;
+ __entry->bytes_alloc = bytes_alloc;
+ __entry->gfp_flags = gfp_flags;
+ __entry->node = node;
+ ),
+
+ TP_printk("call_site=%lx ptr=%p bytes_req=%zu bytes_alloc=%zu gfp_flags=%s node=%d",
+ __entry->call_site,
+ __entry->ptr,
+ __entry->bytes_req,
+ __entry->bytes_alloc,
+ show_gfp_flags(__entry->gfp_flags),
+ __entry->node)
+);
+
+TRACE_EVENT(kfree,
+
+ TP_PROTO(unsigned long call_site, const void *ptr),
+
+ TP_ARGS(call_site, ptr),
+
+ TP_STRUCT__entry(
+ __field( unsigned long, call_site )
+ __field( const void *, ptr )
+ ),
+
+ TP_fast_assign(
+ __entry->call_site = call_site;
+ __entry->ptr = ptr;
+ ),
+
+ TP_printk("call_site=%lx ptr=%p", __entry->call_site, __entry->ptr)
+);
+
+TRACE_EVENT(kmem_cache_free,
+
+ TP_PROTO(unsigned long call_site, const void *ptr),
+
+ TP_ARGS(call_site, ptr),
+
+ TP_STRUCT__entry(
+ __field( unsigned long, call_site )
+ __field( const void *, ptr )
+ ),
+
+ TP_fast_assign(
+ __entry->call_site = call_site;
+ __entry->ptr = ptr;
+ ),
+
+ TP_printk("call_site=%lx ptr=%p", __entry->call_site, __entry->ptr)
+);
+#endif /* _TRACE_KMEM_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/include/trace/events/lockdep.h b/include/trace/events/lockdep.h
new file mode 100644
index 0000000..0e956c9
--- /dev/null
+++ b/include/trace/events/lockdep.h
@@ -0,0 +1,96 @@
+#if !defined(_TRACE_LOCKDEP_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_LOCKDEP_H
+
+#include <linux/lockdep.h>
+#include <linux/tracepoint.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM lockdep
+
+#ifdef CONFIG_LOCKDEP
+
+TRACE_EVENT(lock_acquire,
+
+ TP_PROTO(struct lockdep_map *lock, unsigned int subclass,
+ int trylock, int read, int check,
+ struct lockdep_map *next_lock, unsigned long ip),
+
+ TP_ARGS(lock, subclass, trylock, read, check, next_lock, ip),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, flags)
+ __string(name, lock->name)
+ ),
+
+ TP_fast_assign(
+ __entry->flags = (trylock ? 1 : 0) | (read ? 2 : 0);
+ __assign_str(name, lock->name);
+ ),
+
+ TP_printk("%s%s%s", (__entry->flags & 1) ? "try " : "",
+ (__entry->flags & 2) ? "read " : "",
+ __get_str(name))
+);
+
+TRACE_EVENT(lock_release,
+
+ TP_PROTO(struct lockdep_map *lock, int nested, unsigned long ip),
+
+ TP_ARGS(lock, nested, ip),
+
+ TP_STRUCT__entry(
+ __string(name, lock->name)
+ ),
+
+ TP_fast_assign(
+ __assign_str(name, lock->name);
+ ),
+
+ TP_printk("%s", __get_str(name))
+);
+
+#ifdef CONFIG_LOCK_STAT
+
+TRACE_EVENT(lock_contended,
+
+ TP_PROTO(struct lockdep_map *lock, unsigned long ip),
+
+ TP_ARGS(lock, ip),
+
+ TP_STRUCT__entry(
+ __string(name, lock->name)
+ ),
+
+ TP_fast_assign(
+ __assign_str(name, lock->name);
+ ),
+
+ TP_printk("%s", __get_str(name))
+);
+
+TRACE_EVENT(lock_acquired,
+ TP_PROTO(struct lockdep_map *lock, unsigned long ip, s64 waittime),
+
+ TP_ARGS(lock, ip, waittime),
+
+ TP_STRUCT__entry(
+ __string(name, lock->name)
+ __field(unsigned long, wait_usec)
+ __field(unsigned long, wait_nsec_rem)
+ ),
+ TP_fast_assign(
+ __assign_str(name, lock->name);
+ __entry->wait_nsec_rem = do_div(waittime, NSEC_PER_USEC);
+ __entry->wait_usec = (unsigned long) waittime;
+ ),
+ TP_printk("%s (%lu.%03lu us)", __get_str(name), __entry->wait_usec,
+ __entry->wait_nsec_rem)
+);
+
+#endif
+#endif
+
+#endif /* _TRACE_LOCKDEP_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/include/trace/sched_event_types.h b/include/trace/events/sched.h
similarity index 91%
rename from include/trace/sched_event_types.h
rename to include/trace/events/sched.h
index 63547dc..24ab5bc 100644
--- a/include/trace/sched_event_types.h
+++ b/include/trace/events/sched.h
@@ -1,9 +1,8 @@
+#if !defined(_TRACE_SCHED_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_SCHED_H
-/* use <trace/sched.h> instead */
-#ifndef TRACE_EVENT
-# error Do not include this file directly.
-# error Unless you know what you are doing.
-#endif
+#include <linux/sched.h>
+#include <linux/tracepoint.h>
#undef TRACE_SYSTEM
#define TRACE_SYSTEM sched
@@ -157,6 +156,7 @@ TRACE_EVENT(sched_switch,
__array( char, prev_comm, TASK_COMM_LEN )
__field( pid_t, prev_pid )
__field( int, prev_prio )
+ __field( long, prev_state )
__array( char, next_comm, TASK_COMM_LEN )
__field( pid_t, next_pid )
__field( int, next_prio )
@@ -166,13 +166,19 @@ TRACE_EVENT(sched_switch,
memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);
__entry->prev_pid = prev->pid;
__entry->prev_prio = prev->prio;
+ __entry->prev_state = prev->state;
memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
__entry->next_pid = next->pid;
__entry->next_prio = next->prio;
),
- TP_printk("task %s:%d [%d] ==> %s:%d [%d]",
+ TP_printk("task %s:%d [%d] (%s) ==> %s:%d [%d]",
__entry->prev_comm, __entry->prev_pid, __entry->prev_prio,
+ __entry->prev_state ?
+ __print_flags(__entry->prev_state, "|",
+ { 1, "S"} , { 2, "D" }, { 4, "T" }, { 8, "t" },
+ { 16, "Z" }, { 32, "X" }, { 64, "x" },
+ { 128, "W" }) : "R",
__entry->next_comm, __entry->next_pid, __entry->next_prio)
);
@@ -181,9 +187,9 @@ TRACE_EVENT(sched_switch,
*/
TRACE_EVENT(sched_migrate_task,
- TP_PROTO(struct task_struct *p, int orig_cpu, int dest_cpu),
+ TP_PROTO(struct task_struct *p, int dest_cpu),
- TP_ARGS(p, orig_cpu, dest_cpu),
+ TP_ARGS(p, dest_cpu),
TP_STRUCT__entry(
__array( char, comm, TASK_COMM_LEN )
@@ -197,7 +203,7 @@ TRACE_EVENT(sched_migrate_task,
memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
__entry->pid = p->pid;
__entry->prio = p->prio;
- __entry->orig_cpu = orig_cpu;
+ __entry->orig_cpu = task_cpu(p);
__entry->dest_cpu = dest_cpu;
),
@@ -334,4 +340,7 @@ TRACE_EVENT(sched_signal_send,
__entry->sig, __entry->comm, __entry->pid)
);
-#undef TRACE_SYSTEM
+#endif /* _TRACE_SCHED_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/include/trace/events/skb.h b/include/trace/events/skb.h
new file mode 100644
index 0000000..1e8fabb
--- /dev/null
+++ b/include/trace/events/skb.h
@@ -0,0 +1,40 @@
+#if !defined(_TRACE_SKB_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_SKB_H
+
+#include <linux/skbuff.h>
+#include <linux/tracepoint.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM skb
+
+/*
+ * Tracepoint for free an sk_buff:
+ */
+TRACE_EVENT(kfree_skb,
+
+ TP_PROTO(struct sk_buff *skb, void *location),
+
+ TP_ARGS(skb, location),
+
+ TP_STRUCT__entry(
+ __field( void *, skbaddr )
+ __field( unsigned short, protocol )
+ __field( void *, location )
+ ),
+
+ TP_fast_assign(
+ __entry->skbaddr = skb;
+ if (skb) {
+ __entry->protocol = ntohs(skb->protocol);
+ }
+ __entry->location = location;
+ ),
+
+ TP_printk("skbaddr=%p protocol=%u location=%p",
+ __entry->skbaddr, __entry->protocol, __entry->location)
+);
+
+#endif /* _TRACE_SKB_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/include/trace/events/workqueue.h b/include/trace/events/workqueue.h
new file mode 100644
index 0000000..035f1bf
--- /dev/null
+++ b/include/trace/events/workqueue.h
@@ -0,0 +1,100 @@
+#if !defined(_TRACE_WORKQUEUE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_WORKQUEUE_H
+
+#include <linux/workqueue.h>
+#include <linux/sched.h>
+#include <linux/tracepoint.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM workqueue
+
+TRACE_EVENT(workqueue_insertion,
+
+ TP_PROTO(struct task_struct *wq_thread, struct work_struct *work),
+
+ TP_ARGS(wq_thread, work),
+
+ TP_STRUCT__entry(
+ __array(char, thread_comm, TASK_COMM_LEN)
+ __field(pid_t, thread_pid)
+ __field(work_func_t, func)
+ ),
+
+ TP_fast_assign(
+ memcpy(__entry->thread_comm, wq_thread->comm, TASK_COMM_LEN);
+ __entry->thread_pid = wq_thread->pid;
+ __entry->func = work->func;
+ ),
+
+ TP_printk("thread=%s:%d func=%pF", __entry->thread_comm,
+ __entry->thread_pid, __entry->func)
+);
+
+TRACE_EVENT(workqueue_execution,
+
+ TP_PROTO(struct task_struct *wq_thread, struct work_struct *work),
+
+ TP_ARGS(wq_thread, work),
+
+ TP_STRUCT__entry(
+ __array(char, thread_comm, TASK_COMM_LEN)
+ __field(pid_t, thread_pid)
+ __field(work_func_t, func)
+ ),
+
+ TP_fast_assign(
+ memcpy(__entry->thread_comm, wq_thread->comm, TASK_COMM_LEN);
+ __entry->thread_pid = wq_thread->pid;
+ __entry->func = work->func;
+ ),
+
+ TP_printk("thread=%s:%d func=%pF", __entry->thread_comm,
+ __entry->thread_pid, __entry->func)
+);
+
+/* Trace the creation of one workqueue thread on a cpu */
+TRACE_EVENT(workqueue_creation,
+
+ TP_PROTO(struct task_struct *wq_thread, int cpu),
+
+ TP_ARGS(wq_thread, cpu),
+
+ TP_STRUCT__entry(
+ __array(char, thread_comm, TASK_COMM_LEN)
+ __field(pid_t, thread_pid)
+ __field(int, cpu)
+ ),
+
+ TP_fast_assign(
+ memcpy(__entry->thread_comm, wq_thread->comm, TASK_COMM_LEN);
+ __entry->thread_pid = wq_thread->pid;
+ __entry->cpu = cpu;
+ ),
+
+ TP_printk("thread=%s:%d cpu=%d", __entry->thread_comm,
+ __entry->thread_pid, __entry->cpu)
+);
+
+TRACE_EVENT(workqueue_destruction,
+
+ TP_PROTO(struct task_struct *wq_thread),
+
+ TP_ARGS(wq_thread),
+
+ TP_STRUCT__entry(
+ __array(char, thread_comm, TASK_COMM_LEN)
+ __field(pid_t, thread_pid)
+ ),
+
+ TP_fast_assign(
+ memcpy(__entry->thread_comm, wq_thread->comm, TASK_COMM_LEN);
+ __entry->thread_pid = wq_thread->pid;
+ ),
+
+ TP_printk("thread=%s:%d", __entry->thread_comm, __entry->thread_pid)
+);
+
+#endif /* _TRACE_WORKQUEUE_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
new file mode 100644
index 0000000..1867553
--- /dev/null
+++ b/include/trace/ftrace.h
@@ -0,0 +1,591 @@
+/*
+ * Stage 1 of the trace events.
+ *
+ * Override the macros in <trace/trace_events.h> to include the following:
+ *
+ * struct ftrace_raw_<call> {
+ * struct trace_entry ent;
+ * <type> <item>;
+ * <type2> <item2>[<len>];
+ * [...]
+ * };
+ *
+ * The <type> <item> is created by the __field(type, item) macro or
+ * the __array(type2, item2, len) macro.
+ * We simply do "type item;", and that will create the fields
+ * in the structure.
+ */
+
+#include <linux/ftrace_event.h>
+
+#undef __field
+#define __field(type, item) type item;
+
+#undef __array
+#define __array(type, item, len) type item[len];
+
+#undef __dynamic_array
+#define __dynamic_array(type, item, len) unsigned short __data_loc_##item;
+
+#undef __string
+#define __string(item, src) __dynamic_array(char, item, -1)
+
+#undef TP_STRUCT__entry
+#define TP_STRUCT__entry(args...) args
+
+#undef TRACE_EVENT
+#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
+ struct ftrace_raw_##name { \
+ struct trace_entry ent; \
+ tstruct \
+ char __data[0]; \
+ }; \
+ static struct ftrace_event_call event_##name
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+
+/*
+ * Stage 2 of the trace events.
+ *
+ * Include the following:
+ *
+ * struct ftrace_data_offsets_<call> {
+ * int <item1>;
+ * int <item2>;
+ * [...]
+ * };
+ *
+ * The __dynamic_array() macro will create each int <item>, this is
+ * to keep the offset of each array from the beginning of the event.
+ */
+
+#undef __field
+#define __field(type, item);
+
+#undef __array
+#define __array(type, item, len)
+
+#undef __dynamic_array
+#define __dynamic_array(type, item, len) int item;
+
+#undef __string
+#define __string(item, src) __dynamic_array(char, item, -1)
+
+#undef TRACE_EVENT
+#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
+ struct ftrace_data_offsets_##call { \
+ tstruct; \
+ };
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/*
+ * Setup the showing format of trace point.
+ *
+ * int
+ * ftrace_format_##call(struct trace_seq *s)
+ * {
+ * struct ftrace_raw_##call field;
+ * int ret;
+ *
+ * ret = trace_seq_printf(s, #type " " #item ";"
+ * " offset:%u; size:%u;\n",
+ * offsetof(struct ftrace_raw_##call, item),
+ * sizeof(field.type));
+ *
+ * }
+ */
+
+#undef TP_STRUCT__entry
+#define TP_STRUCT__entry(args...) args
+
+#undef __field
+#define __field(type, item) \
+ ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \
+ "offset:%u;\tsize:%u;\n", \
+ (unsigned int)offsetof(typeof(field), item), \
+ (unsigned int)sizeof(field.item)); \
+ if (!ret) \
+ return 0;
+
+#undef __array
+#define __array(type, item, len) \
+ ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \
+ "offset:%u;\tsize:%u;\n", \
+ (unsigned int)offsetof(typeof(field), item), \
+ (unsigned int)sizeof(field.item)); \
+ if (!ret) \
+ return 0;
+
+#undef __dynamic_array
+#define __dynamic_array(type, item, len) \
+ ret = trace_seq_printf(s, "\tfield:__data_loc " #item ";\t" \
+ "offset:%u;\tsize:%u;\n", \
+ (unsigned int)offsetof(typeof(field), \
+ __data_loc_##item), \
+ (unsigned int)sizeof(field.__data_loc_##item)); \
+ if (!ret) \
+ return 0;
+
+#undef __string
+#define __string(item, src) __dynamic_array(char, item, -1)
+
+#undef __entry
+#define __entry REC
+
+#undef __print_symbolic
+#undef __get_dynamic_array
+#undef __get_str
+
+#undef TP_printk
+#define TP_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args)
+
+#undef TP_fast_assign
+#define TP_fast_assign(args...) args
+
+#undef TRACE_EVENT
+#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
+static int \
+ftrace_format_##call(struct trace_seq *s) \
+{ \
+ struct ftrace_raw_##call field __attribute__((unused)); \
+ int ret = 0; \
+ \
+ tstruct; \
+ \
+ trace_seq_printf(s, "\nprint fmt: " print); \
+ \
+ return ret; \
+}
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/*
+ * Stage 3 of the trace events.
+ *
+ * Override the macros in <trace/trace_events.h> to include the following:
+ *
+ * enum print_line_t
+ * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
+ * {
+ * struct trace_seq *s = &iter->seq;
+ * struct ftrace_raw_<call> *field; <-- defined in stage 1
+ * struct trace_entry *entry;
+ * struct trace_seq *p;
+ * int ret;
+ *
+ * entry = iter->ent;
+ *
+ * if (entry->type != event_<call>.id) {
+ * WARN_ON_ONCE(1);
+ * return TRACE_TYPE_UNHANDLED;
+ * }
+ *
+ * field = (typeof(field))entry;
+ *
+ * p = get_cpu_var(ftrace_event_seq);
+ * trace_seq_init(p);
+ * ret = trace_seq_printf(s, <TP_printk> "\n");
+ * put_cpu();
+ * if (!ret)
+ * return TRACE_TYPE_PARTIAL_LINE;
+ *
+ * return TRACE_TYPE_HANDLED;
+ * }
+ *
+ * This is the method used to print the raw event to the trace
+ * output format. Note, this is not needed if the data is read
+ * in binary.
+ */
+
+#undef __entry
+#define __entry field
+
+#undef TP_printk
+#define TP_printk(fmt, args...) fmt "\n", args
+
+#undef __get_dynamic_array
+#define __get_dynamic_array(field) \
+ ((void *)__entry + __entry->__data_loc_##field)
+
+#undef __get_str
+#define __get_str(field) (char *)__get_dynamic_array(field)
+
+#undef __print_flags
+#define __print_flags(flag, delim, flag_array...) \
+ ({ \
+ static const struct trace_print_flags flags[] = \
+ { flag_array, { -1, NULL }}; \
+ ftrace_print_flags_seq(p, delim, flag, flags); \
+ })
+
+#undef __print_symbolic
+#define __print_symbolic(value, symbol_array...) \
+ ({ \
+ static const struct trace_print_flags symbols[] = \
+ { symbol_array, { -1, NULL }}; \
+ ftrace_print_symbols_seq(p, value, symbols); \
+ })
+
+#undef TRACE_EVENT
+#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
+enum print_line_t \
+ftrace_raw_output_##call(struct trace_iterator *iter, int flags) \
+{ \
+ struct trace_seq *s = &iter->seq; \
+ struct ftrace_raw_##call *field; \
+ struct trace_entry *entry; \
+ struct trace_seq *p; \
+ int ret; \
+ \
+ entry = iter->ent; \
+ \
+ if (entry->type != event_##call.id) { \
+ WARN_ON_ONCE(1); \
+ return TRACE_TYPE_UNHANDLED; \
+ } \
+ \
+ field = (typeof(field))entry; \
+ \
+ p = &get_cpu_var(ftrace_event_seq); \
+ trace_seq_init(p); \
+ ret = trace_seq_printf(s, #call ": " print); \
+ put_cpu(); \
+ if (!ret) \
+ return TRACE_TYPE_PARTIAL_LINE; \
+ \
+ return TRACE_TYPE_HANDLED; \
+}
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+#undef __field
+#define __field(type, item) \
+ ret = trace_define_field(event_call, #type, #item, \
+ offsetof(typeof(field), item), \
+ sizeof(field.item), is_signed_type(type)); \
+ if (ret) \
+ return ret;
+
+#undef __array
+#define __array(type, item, len) \
+ BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
+ ret = trace_define_field(event_call, #type "[" #len "]", #item, \
+ offsetof(typeof(field), item), \
+ sizeof(field.item), 0); \
+ if (ret) \
+ return ret;
+
+#undef __dynamic_array
+#define __dynamic_array(type, item, len) \
+ ret = trace_define_field(event_call, "__data_loc" "[" #type "]", #item,\
+ offsetof(typeof(field), __data_loc_##item), \
+ sizeof(field.__data_loc_##item), 0);
+
+#undef __string
+#define __string(item, src) __dynamic_array(char, item, -1)
+
+#undef TRACE_EVENT
+#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
+int \
+ftrace_define_fields_##call(void) \
+{ \
+ struct ftrace_raw_##call field; \
+ struct ftrace_event_call *event_call = &event_##call; \
+ int ret; \
+ \
+ __common_field(int, type, 1); \
+ __common_field(unsigned char, flags, 0); \
+ __common_field(unsigned char, preempt_count, 0); \
+ __common_field(int, pid, 1); \
+ __common_field(int, tgid, 1); \
+ \
+ tstruct; \
+ \
+ return ret; \
+}
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/*
+ * remember the offset of each array from the beginning of the event.
+ */
+
+#undef __entry
+#define __entry entry
+
+#undef __field
+#define __field(type, item)
+
+#undef __array
+#define __array(type, item, len)
+
+#undef __dynamic_array
+#define __dynamic_array(type, item, len) \
+ __data_offsets->item = __data_size + \
+ offsetof(typeof(*entry), __data); \
+ __data_size += (len) * sizeof(type);
+
+#undef __string
+#define __string(item, src) __dynamic_array(char, item, strlen(src) + 1) \
+
+#undef TRACE_EVENT
+#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
+static inline int ftrace_get_offsets_##call( \
+ struct ftrace_data_offsets_##call *__data_offsets, proto) \
+{ \
+ int __data_size = 0; \
+ struct ftrace_raw_##call __maybe_unused *entry; \
+ \
+ tstruct; \
+ \
+ return __data_size; \
+}
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/*
+ * Stage 4 of the trace events.
+ *
+ * Override the macros in <trace/trace_events.h> to include the following:
+ *
+ * static void ftrace_event_<call>(proto)
+ * {
+ * event_trace_printk(_RET_IP_, "<call>: " <fmt>);
+ * }
+ *
+ * static int ftrace_reg_event_<call>(void)
+ * {
+ * int ret;
+ *
+ * ret = register_trace_<call>(ftrace_event_<call>);
+ * if (!ret)
+ * pr_info("event trace: Could not activate trace point "
+ * "probe to <call>");
+ * return ret;
+ * }
+ *
+ * static void ftrace_unreg_event_<call>(void)
+ * {
+ * unregister_trace_<call>(ftrace_event_<call>);
+ * }
+ *
+ *
+ * For those macros defined with TRACE_EVENT:
+ *
+ * static struct ftrace_event_call event_<call>;
+ *
+ * static void ftrace_raw_event_<call>(proto)
+ * {
+ * struct ring_buffer_event *event;
+ * struct ftrace_raw_<call> *entry; <-- defined in stage 1
+ * unsigned long irq_flags;
+ * int pc;
+ *
+ * local_save_flags(irq_flags);
+ * pc = preempt_count();
+ *
+ * event = trace_current_buffer_lock_reserve(event_<call>.id,
+ * sizeof(struct ftrace_raw_<call>),
+ * irq_flags, pc);
+ * if (!event)
+ * return;
+ * entry = ring_buffer_event_data(event);
+ *
+ * <assign>; <-- Here we assign the entries by the __field and
+ * __array macros.
+ *
+ * trace_current_buffer_unlock_commit(event, irq_flags, pc);
+ * }
+ *
+ * static int ftrace_raw_reg_event_<call>(void)
+ * {
+ * int ret;
+ *
+ * ret = register_trace_<call>(ftrace_raw_event_<call>);
+ * if (!ret)
+ * pr_info("event trace: Could not activate trace point "
+ * "probe to <call>");
+ * return ret;
+ * }
+ *
+ * static void ftrace_unreg_event_<call>(void)
+ * {
+ * unregister_trace_<call>(ftrace_raw_event_<call>);
+ * }
+ *
+ * static struct trace_event ftrace_event_type_<call> = {
+ * .trace = ftrace_raw_output_<call>, <-- stage 2
+ * };
+ *
+ * static int ftrace_raw_init_event_<call>(void)
+ * {
+ * int id;
+ *
+ * id = register_ftrace_event(&ftrace_event_type_<call>);
+ * if (!id)
+ * return -ENODEV;
+ * event_<call>.id = id;
+ * return 0;
+ * }
+ *
+ * static struct ftrace_event_call __used
+ * __attribute__((__aligned__(4)))
+ * __attribute__((section("_ftrace_events"))) event_<call> = {
+ * .name = "<call>",
+ * .system = "<system>",
+ * .raw_init = ftrace_raw_init_event_<call>,
+ * .regfunc = ftrace_reg_event_<call>,
+ * .unregfunc = ftrace_unreg_event_<call>,
+ * .show_format = ftrace_format_<call>,
+ * }
+ *
+ */
+
+#undef TP_FMT
+#define TP_FMT(fmt, args...) fmt "\n", ##args
+
+#ifdef CONFIG_EVENT_PROFILE
+#define _TRACE_PROFILE(call, proto, args) \
+static void ftrace_profile_##call(proto) \
+{ \
+ extern void perf_tpcounter_event(int); \
+ perf_tpcounter_event(event_##call.id); \
+} \
+ \
+static int ftrace_profile_enable_##call(struct ftrace_event_call *event_call) \
+{ \
+ int ret = 0; \
+ \
+ if (!atomic_inc_return(&event_call->profile_count)) \
+ ret = register_trace_##call(ftrace_profile_##call); \
+ \
+ return ret; \
+} \
+ \
+static void ftrace_profile_disable_##call(struct ftrace_event_call *event_call)\
+{ \
+ if (atomic_add_negative(-1, &event_call->profile_count)) \
+ unregister_trace_##call(ftrace_profile_##call); \
+}
+
+#define _TRACE_PROFILE_INIT(call) \
+ .profile_count = ATOMIC_INIT(-1), \
+ .profile_enable = ftrace_profile_enable_##call, \
+ .profile_disable = ftrace_profile_disable_##call,
+
+#else
+#define _TRACE_PROFILE(call, proto, args)
+#define _TRACE_PROFILE_INIT(call)
+#endif
+
+#undef __entry
+#define __entry entry
+
+#undef __field
+#define __field(type, item)
+
+#undef __array
+#define __array(type, item, len)
+
+#undef __dynamic_array
+#define __dynamic_array(type, item, len) \
+ __entry->__data_loc_##item = __data_offsets.item;
+
+#undef __string
+#define __string(item, src) __dynamic_array(char, item, -1) \
+
+#undef __assign_str
+#define __assign_str(dst, src) \
+ strcpy(__get_str(dst), src);
+
+#undef TRACE_EVENT
+#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
+_TRACE_PROFILE(call, PARAMS(proto), PARAMS(args)) \
+ \
+static struct ftrace_event_call event_##call; \
+ \
+static void ftrace_raw_event_##call(proto) \
+{ \
+ struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
+ struct ftrace_event_call *event_call = &event_##call; \
+ struct ring_buffer_event *event; \
+ struct ftrace_raw_##call *entry; \
+ unsigned long irq_flags; \
+ int __data_size; \
+ int pc; \
+ \
+ local_save_flags(irq_flags); \
+ pc = preempt_count(); \
+ \
+ __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
+ \
+ event = trace_current_buffer_lock_reserve(event_##call.id, \
+ sizeof(*entry) + __data_size, \
+ irq_flags, pc); \
+ if (!event) \
+ return; \
+ entry = ring_buffer_event_data(event); \
+ \
+ \
+ tstruct \
+ \
+ { assign; } \
+ \
+ if (!filter_current_check_discard(event_call, entry, event)) \
+ trace_nowake_buffer_unlock_commit(event, irq_flags, pc); \
+} \
+ \
+static int ftrace_raw_reg_event_##call(void) \
+{ \
+ int ret; \
+ \
+ ret = register_trace_##call(ftrace_raw_event_##call); \
+ if (ret) \
+ pr_info("event trace: Could not activate trace point " \
+ "probe to " #call "\n"); \
+ return ret; \
+} \
+ \
+static void ftrace_raw_unreg_event_##call(void) \
+{ \
+ unregister_trace_##call(ftrace_raw_event_##call); \
+} \
+ \
+static struct trace_event ftrace_event_type_##call = { \
+ .trace = ftrace_raw_output_##call, \
+}; \
+ \
+static int ftrace_raw_init_event_##call(void) \
+{ \
+ int id; \
+ \
+ id = register_ftrace_event(&ftrace_event_type_##call); \
+ if (!id) \
+ return -ENODEV; \
+ event_##call.id = id; \
+ INIT_LIST_HEAD(&event_##call.fields); \
+ init_preds(&event_##call); \
+ return 0; \
+} \
+ \
+static struct ftrace_event_call __used \
+__attribute__((__aligned__(4))) \
+__attribute__((section("_ftrace_events"))) event_##call = { \
+ .name = #call, \
+ .system = __stringify(TRACE_SYSTEM), \
+ .event = &ftrace_event_type_##call, \
+ .raw_init = ftrace_raw_init_event_##call, \
+ .regfunc = ftrace_raw_reg_event_##call, \
+ .unregfunc = ftrace_raw_unreg_event_##call, \
+ .show_format = ftrace_format_##call, \
+ .define_fields = ftrace_define_fields_##call, \
+ _TRACE_PROFILE_INIT(call) \
+}
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+#undef _TRACE_PROFILE
+#undef _TRACE_PROFILE_INIT
+
diff --git a/include/trace/irq.h b/include/trace/irq.h
deleted file mode 100644
index ff5d449..0000000
--- a/include/trace/irq.h
+++ /dev/null
@@ -1,9 +0,0 @@
-#ifndef _TRACE_IRQ_H
-#define _TRACE_IRQ_H
-
-#include <linux/interrupt.h>
-#include <linux/tracepoint.h>
-
-#include <trace/irq_event_types.h>
-
-#endif
diff --git a/include/trace/irq_event_types.h b/include/trace/irq_event_types.h
deleted file mode 100644
index 85964eb..0000000
--- a/include/trace/irq_event_types.h
+++ /dev/null
@@ -1,55 +0,0 @@
-
-/* use <trace/irq.h> instead */
-#ifndef TRACE_FORMAT
-# error Do not include this file directly.
-# error Unless you know what you are doing.
-#endif
-
-#undef TRACE_SYSTEM
-#define TRACE_SYSTEM irq
-
-/*
- * Tracepoint for entry of interrupt handler:
- */
-TRACE_FORMAT(irq_handler_entry,
- TP_PROTO(int irq, struct irqaction *action),
- TP_ARGS(irq, action),
- TP_FMT("irq=%d handler=%s", irq, action->name)
- );
-
-/*
- * Tracepoint for return of an interrupt handler:
- */
-TRACE_EVENT(irq_handler_exit,
-
- TP_PROTO(int irq, struct irqaction *action, int ret),
-
- TP_ARGS(irq, action, ret),
-
- TP_STRUCT__entry(
- __field( int, irq )
- __field( int, ret )
- ),
-
- TP_fast_assign(
- __entry->irq = irq;
- __entry->ret = ret;
- ),
-
- TP_printk("irq=%d return=%s",
- __entry->irq, __entry->ret ? "handled" : "unhandled")
-);
-
-TRACE_FORMAT(softirq_entry,
- TP_PROTO(struct softirq_action *h, struct softirq_action *vec),
- TP_ARGS(h, vec),
- TP_FMT("softirq=%d action=%s", (int)(h - vec), softirq_to_name[h-vec])
- );
-
-TRACE_FORMAT(softirq_exit,
- TP_PROTO(struct softirq_action *h, struct softirq_action *vec),
- TP_ARGS(h, vec),
- TP_FMT("softirq=%d action=%s", (int)(h - vec), softirq_to_name[h-vec])
- );
-
-#undef TRACE_SYSTEM
diff --git a/include/trace/kmemtrace.h b/include/trace/kmemtrace.h
deleted file mode 100644
index 28ee69f..0000000
--- a/include/trace/kmemtrace.h
+++ /dev/null
@@ -1,63 +0,0 @@
-/*
- * Copyright (C) 2008 Eduard - Gabriel Munteanu
- *
- * This file is released under GPL version 2.
- */
-
-#ifndef _LINUX_KMEMTRACE_H
-#define _LINUX_KMEMTRACE_H
-
-#ifdef __KERNEL__
-
-#include <linux/tracepoint.h>
-#include <linux/types.h>
-
-#ifdef CONFIG_KMEMTRACE
-extern void kmemtrace_init(void);
-#else
-static inline void kmemtrace_init(void)
-{
-}
-#endif
-
-DECLARE_TRACE(kmalloc,
- TP_PROTO(unsigned long call_site,
- const void *ptr,
- size_t bytes_req,
- size_t bytes_alloc,
- gfp_t gfp_flags),
- TP_ARGS(call_site, ptr, bytes_req, bytes_alloc, gfp_flags));
-DECLARE_TRACE(kmem_cache_alloc,
- TP_PROTO(unsigned long call_site,
- const void *ptr,
- size_t bytes_req,
- size_t bytes_alloc,
- gfp_t gfp_flags),
- TP_ARGS(call_site, ptr, bytes_req, bytes_alloc, gfp_flags));
-DECLARE_TRACE(kmalloc_node,
- TP_PROTO(unsigned long call_site,
- const void *ptr,
- size_t bytes_req,
- size_t bytes_alloc,
- gfp_t gfp_flags,
- int node),
- TP_ARGS(call_site, ptr, bytes_req, bytes_alloc, gfp_flags, node));
-DECLARE_TRACE(kmem_cache_alloc_node,
- TP_PROTO(unsigned long call_site,
- const void *ptr,
- size_t bytes_req,
- size_t bytes_alloc,
- gfp_t gfp_flags,
- int node),
- TP_ARGS(call_site, ptr, bytes_req, bytes_alloc, gfp_flags, node));
-DECLARE_TRACE(kfree,
- TP_PROTO(unsigned long call_site, const void *ptr),
- TP_ARGS(call_site, ptr));
-DECLARE_TRACE(kmem_cache_free,
- TP_PROTO(unsigned long call_site, const void *ptr),
- TP_ARGS(call_site, ptr));
-
-#endif /* __KERNEL__ */
-
-#endif /* _LINUX_KMEMTRACE_H */
-
diff --git a/include/trace/lockdep.h b/include/trace/lockdep.h
deleted file mode 100644
index 5ca67df..0000000
--- a/include/trace/lockdep.h
+++ /dev/null
@@ -1,9 +0,0 @@
-#ifndef _TRACE_LOCKDEP_H
-#define _TRACE_LOCKDEP_H
-
-#include <linux/lockdep.h>
-#include <linux/tracepoint.h>
-
-#include <trace/lockdep_event_types.h>
-
-#endif
diff --git a/include/trace/lockdep_event_types.h b/include/trace/lockdep_event_types.h
deleted file mode 100644
index adccfcd..0000000
--- a/include/trace/lockdep_event_types.h
+++ /dev/null
@@ -1,44 +0,0 @@
-
-#ifndef TRACE_FORMAT
-# error Do not include this file directly.
-# error Unless you know what you are doing.
-#endif
-
-#undef TRACE_SYSTEM
-#define TRACE_SYSTEM lock
-
-#ifdef CONFIG_LOCKDEP
-
-TRACE_FORMAT(lock_acquire,
- TP_PROTO(struct lockdep_map *lock, unsigned int subclass,
- int trylock, int read, int check,
- struct lockdep_map *next_lock, unsigned long ip),
- TP_ARGS(lock, subclass, trylock, read, check, next_lock, ip),
- TP_FMT("%s%s%s", trylock ? "try " : "",
- read ? "read " : "", lock->name)
- );
-
-TRACE_FORMAT(lock_release,
- TP_PROTO(struct lockdep_map *lock, int nested, unsigned long ip),
- TP_ARGS(lock, nested, ip),
- TP_FMT("%s", lock->name)
- );
-
-#ifdef CONFIG_LOCK_STAT
-
-TRACE_FORMAT(lock_contended,
- TP_PROTO(struct lockdep_map *lock, unsigned long ip),
- TP_ARGS(lock, ip),
- TP_FMT("%s", lock->name)
- );
-
-TRACE_FORMAT(lock_acquired,
- TP_PROTO(struct lockdep_map *lock, unsigned long ip),
- TP_ARGS(lock, ip),
- TP_FMT("%s", lock->name)
- );
-
-#endif
-#endif
-
-#undef TRACE_SYSTEM
diff --git a/include/trace/sched.h b/include/trace/sched.h
deleted file mode 100644
index 4e372a1..0000000
--- a/include/trace/sched.h
+++ /dev/null
@@ -1,9 +0,0 @@
-#ifndef _TRACE_SCHED_H
-#define _TRACE_SCHED_H
-
-#include <linux/sched.h>
-#include <linux/tracepoint.h>
-
-#include <trace/sched_event_types.h>
-
-#endif
diff --git a/include/trace/skb.h b/include/trace/skb.h
deleted file mode 100644
index b66206d..0000000
--- a/include/trace/skb.h
+++ /dev/null
@@ -1,11 +0,0 @@
-#ifndef _TRACE_SKB_H_
-#define _TRACE_SKB_H_
-
-#include <linux/skbuff.h>
-#include <linux/tracepoint.h>
-
-DECLARE_TRACE(kfree_skb,
- TP_PROTO(struct sk_buff *skb, void *location),
- TP_ARGS(skb, location));
-
-#endif
diff --git a/include/trace/trace_event_types.h b/include/trace/trace_event_types.h
deleted file mode 100644
index df56f56..0000000
--- a/include/trace/trace_event_types.h
+++ /dev/null
@@ -1,5 +0,0 @@
-/* trace/<type>_event_types.h here */
-
-#include <trace/sched_event_types.h>
-#include <trace/irq_event_types.h>
-#include <trace/lockdep_event_types.h>
diff --git a/include/trace/trace_events.h b/include/trace/trace_events.h
deleted file mode 100644
index fd13750..0000000
--- a/include/trace/trace_events.h
+++ /dev/null
@@ -1,5 +0,0 @@
-/* trace/<type>.h here */
-
-#include <trace/sched.h>
-#include <trace/irq.h>
-#include <trace/lockdep.h>
diff --git a/include/trace/workqueue.h b/include/trace/workqueue.h
deleted file mode 100644
index 7626523..0000000
--- a/include/trace/workqueue.h
+++ /dev/null
@@ -1,25 +0,0 @@
-#ifndef __TRACE_WORKQUEUE_H
-#define __TRACE_WORKQUEUE_H
-
-#include <linux/tracepoint.h>
-#include <linux/workqueue.h>
-#include <linux/sched.h>
-
-DECLARE_TRACE(workqueue_insertion,
- TP_PROTO(struct task_struct *wq_thread, struct work_struct *work),
- TP_ARGS(wq_thread, work));
-
-DECLARE_TRACE(workqueue_execution,
- TP_PROTO(struct task_struct *wq_thread, struct work_struct *work),
- TP_ARGS(wq_thread, work));
-
-/* Trace the creation of one workqueue thread on a cpu */
-DECLARE_TRACE(workqueue_creation,
- TP_PROTO(struct task_struct *wq_thread, int cpu),
- TP_ARGS(wq_thread, cpu));
-
-DECLARE_TRACE(workqueue_destruction,
- TP_PROTO(struct task_struct *wq_thread),
- TP_ARGS(wq_thread));
-
-#endif /* __TRACE_WORKQUEUE_H */
diff --git a/init/main.c b/init/main.c
index 3bbf93b..7c6a652 100644
--- a/init/main.c
+++ b/init/main.c
@@ -64,6 +64,7 @@
#include <linux/idr.h>
#include <linux/ftrace.h>
#include <linux/async.h>
+#include <linux/kmemtrace.h>
#include <trace/boot.h>
#include <asm/io.h>
@@ -71,7 +72,6 @@
#include <asm/setup.h>
#include <asm/sections.h>
#include <asm/cacheflush.h>
-#include <trace/kmemtrace.h>
#ifdef CONFIG_X86_LOCAL_APIC
#include <asm/smp.h>
diff --git a/kernel/Makefile b/kernel/Makefile
index 4242366..a35eee3 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -93,6 +93,7 @@ obj-$(CONFIG_LATENCYTOP) += latencytop.o
obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o
obj-$(CONFIG_FUNCTION_TRACER) += trace/
obj-$(CONFIG_TRACING) += trace/
+obj-$(CONFIG_X86_DS) += trace/
obj-$(CONFIG_SMP) += sched_cpupri.o
obj-$(CONFIG_SLOW_WORK) += slow-work.o
diff --git a/kernel/exit.c b/kernel/exit.c
index abf9cf3..cab535c 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -48,7 +48,7 @@
#include <linux/tracehook.h>
#include <linux/fs_struct.h>
#include <linux/init_task.h>
-#include <trace/sched.h>
+#include <trace/events/sched.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
@@ -56,10 +56,6 @@
#include <asm/mmu_context.h>
#include "cred-internals.h"
-DEFINE_TRACE(sched_process_free);
-DEFINE_TRACE(sched_process_exit);
-DEFINE_TRACE(sched_process_wait);
-
static void exit_mm(struct task_struct * tsk);
static void __unhash_process(struct task_struct *p)
diff --git a/kernel/fork.c b/kernel/fork.c
index b9e2edd..711468f 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -61,7 +61,6 @@
#include <linux/proc_fs.h>
#include <linux/blkdev.h>
#include <linux/fs_struct.h>
-#include <trace/sched.h>
#include <linux/magic.h>
#include <asm/pgtable.h>
@@ -71,6 +70,8 @@
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
+#include <trace/events/sched.h>
+
/*
* Protected counters by write_lock_irq(&tasklist_lock)
*/
@@ -83,8 +84,6 @@ DEFINE_PER_CPU(unsigned long, process_counts) = 0;
__cacheline_aligned DEFINE_RWLOCK(tasklist_lock); /* outer */
-DEFINE_TRACE(sched_process_fork);
-
int nr_processes(void)
{
int cpu;
@@ -1089,8 +1088,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
#ifdef CONFIG_DEBUG_MUTEXES
p->blocked_on = NULL; /* not blocked yet */
#endif
- if (unlikely(current->ptrace))
- ptrace_fork(p, clone_flags);
+
+ p->bts = NULL;
/* Perform scheduler related setup. Assign this task to a CPU. */
sched_fork(p, clone_flags);
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 26e0875..5dd2572 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -17,8 +17,8 @@
#include <linux/kernel_stat.h>
#include <linux/rculist.h>
#include <linux/hash.h>
-#include <trace/irq.h>
#include <linux/bootmem.h>
+#include <trace/events/irq.h>
#include "internals.h"
@@ -348,9 +348,6 @@ static void warn_no_thread(unsigned int irq, struct irqaction *action)
"but no thread function available.", irq, action->name);
}
-DEFINE_TRACE(irq_handler_entry);
-DEFINE_TRACE(irq_handler_exit);
-
/**
* handle_IRQ_event - irq action chain handler
* @irq: the interrupt number
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 4ebaf85..41c88fe 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -13,7 +13,7 @@
#include <linux/file.h>
#include <linux/module.h>
#include <linux/mutex.h>
-#include <trace/sched.h>
+#include <trace/events/sched.h>
#define KTHREAD_NICE_LEVEL (-5)
@@ -21,9 +21,6 @@ static DEFINE_SPINLOCK(kthread_create_lock);
static LIST_HEAD(kthread_create_list);
struct task_struct *kthreadd_task;
-DEFINE_TRACE(sched_kthread_stop);
-DEFINE_TRACE(sched_kthread_stop_ret);
-
struct kthread_create_info
{
/* Information passed to kthread() from kthreadd. */
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index accb40c..8bbeef9 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -42,12 +42,14 @@
#include <linux/hash.h>
#include <linux/ftrace.h>
#include <linux/stringify.h>
-#include <trace/lockdep.h>
#include <asm/sections.h>
#include "lockdep_internals.h"
+#define CREATE_TRACE_POINTS
+#include <trace/events/lockdep.h>
+
#ifdef CONFIG_PROVE_LOCKING
int prove_locking = 1;
module_param(prove_locking, int, 0644);
@@ -2935,8 +2937,6 @@ void lock_set_class(struct lockdep_map *lock, const char *name,
}
EXPORT_SYMBOL_GPL(lock_set_class);
-DEFINE_TRACE(lock_acquire);
-
/*
* We are not always called with irqs disabled - do that here,
* and also avoid lockdep recursion:
@@ -2963,8 +2963,6 @@ void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
}
EXPORT_SYMBOL_GPL(lock_acquire);
-DEFINE_TRACE(lock_release);
-
void lock_release(struct lockdep_map *lock, int nested,
unsigned long ip)
{
@@ -3105,6 +3103,8 @@ found_it:
hlock->holdtime_stamp = now;
}
+ trace_lock_acquired(lock, ip, waittime);
+
stats = get_lock_stats(hlock_class(hlock));
if (waittime) {
if (hlock->read)
@@ -3120,8 +3120,6 @@ found_it:
lock->ip = ip;
}
-DEFINE_TRACE(lock_contended);
-
void lock_contended(struct lockdep_map *lock, unsigned long ip)
{
unsigned long flags;
@@ -3143,14 +3141,10 @@ void lock_contended(struct lockdep_map *lock, unsigned long ip)
}
EXPORT_SYMBOL_GPL(lock_contended);
-DEFINE_TRACE(lock_acquired);
-
void lock_acquired(struct lockdep_map *lock, unsigned long ip)
{
unsigned long flags;
- trace_lock_acquired(lock, ip);
-
if (unlikely(!lock_stat))
return;
diff --git a/kernel/module.c b/kernel/module.c
index e797812..2383e60 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -18,6 +18,7 @@
*/
#include <linux/module.h>
#include <linux/moduleloader.h>
+#include <linux/ftrace_event.h>
#include <linux/init.h>
#include <linux/kallsyms.h>
#include <linux/fs.h>
@@ -1489,9 +1490,6 @@ static void free_module(struct module *mod)
/* Free any allocated parameters. */
destroy_params(mod->kp, mod->num_kp);
- /* release any pointers to mcount in this module */
- ftrace_release(mod->module_core, mod->core_size);
-
/* This may be NULL, but that's OK */
module_free(mod, mod->module_init);
kfree(mod->args);
@@ -1892,11 +1890,9 @@ static noinline struct module *load_module(void __user *umod,
unsigned int symindex = 0;
unsigned int strindex = 0;
unsigned int modindex, versindex, infoindex, pcpuindex;
- unsigned int num_mcount;
struct module *mod;
long err = 0;
void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
- unsigned long *mseg;
mm_segment_t old_fs;
DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
@@ -2172,7 +2168,19 @@ static noinline struct module *load_module(void __user *umod,
sizeof(*mod->tracepoints),
&mod->num_tracepoints);
#endif
-
+#ifdef CONFIG_EVENT_TRACING
+ mod->trace_events = section_objs(hdr, sechdrs, secstrings,
+ "_ftrace_events",
+ sizeof(*mod->trace_events),
+ &mod->num_trace_events);
+#endif
+#ifdef CONFIG_FTRACE_MCOUNT_RECORD
+ /* sechdrs[0].sh_size is always zero */
+ mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings,
+ "__mcount_loc",
+ sizeof(*mod->ftrace_callsites),
+ &mod->num_ftrace_callsites);
+#endif
#ifdef CONFIG_MODVERSIONS
if ((mod->num_syms && !mod->crcs)
|| (mod->num_gpl_syms && !mod->gpl_crcs)
@@ -2237,11 +2245,6 @@ static noinline struct module *load_module(void __user *umod,
dynamic_debug_setup(debug, num_debug);
}
- /* sechdrs[0].sh_size is always zero */
- mseg = section_objs(hdr, sechdrs, secstrings, "__mcount_loc",
- sizeof(*mseg), &num_mcount);
- ftrace_init_module(mod, mseg, mseg + num_mcount);
-
err = module_finalize(hdr, sechdrs, mod);
if (err < 0)
goto cleanup;
@@ -2302,7 +2305,6 @@ static noinline struct module *load_module(void __user *umod,
cleanup:
kobject_del(&mod->mkobj.kobj);
kobject_put(&mod->mkobj.kobj);
- ftrace_release(mod->module_core, mod->core_size);
free_unload:
module_unload_free(mod);
#if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 0692ab5..e950805 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -25,16 +25,6 @@
/*
- * Initialize a new task whose father had been ptraced.
- *
- * Called from copy_process().
- */
-void ptrace_fork(struct task_struct *child, unsigned long clone_flags)
-{
- arch_ptrace_fork(child, clone_flags);
-}
-
-/*
* ptrace a task: make the debugger its new parent and
* move it to the ptrace list.
*
diff --git a/kernel/sched.c b/kernel/sched.c
index 26efa47..6530a27 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -72,13 +72,15 @@
#include <linux/debugfs.h>
#include <linux/ctype.h>
#include <linux/ftrace.h>
-#include <trace/sched.h>
#include <asm/tlb.h>
#include <asm/irq_regs.h>
#include "sched_cpupri.h"
+#define CREATE_TRACE_POINTS
+#include <trace/events/sched.h>
+
/*
* Convert user-nice values [ -20 ... 0 ... 19 ]
* to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],
@@ -118,12 +120,6 @@
*/
#define RUNTIME_INF ((u64)~0ULL)
-DEFINE_TRACE(sched_wait_task);
-DEFINE_TRACE(sched_wakeup);
-DEFINE_TRACE(sched_wakeup_new);
-DEFINE_TRACE(sched_switch);
-DEFINE_TRACE(sched_migrate_task);
-
#ifdef CONFIG_SMP
static void double_rq_lock(struct rq *rq1, struct rq *rq2);
@@ -1958,7 +1954,7 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
clock_offset = old_rq->clock - new_rq->clock;
- trace_sched_migrate_task(p, task_cpu(p), new_cpu);
+ trace_sched_migrate_task(p, new_cpu);
#ifdef CONFIG_SCHEDSTATS
if (p->se.wait_start)
@@ -2015,6 +2011,49 @@ migrate_task(struct task_struct *p, int dest_cpu, struct migration_req *req)
}
/*
+ * wait_task_context_switch - wait for a thread to complete at least one
+ * context switch.
+ *
+ * @p must not be current.
+ */
+void wait_task_context_switch(struct task_struct *p)
+{
+ unsigned long nvcsw, nivcsw, flags;
+ int running;
+ struct rq *rq;
+
+ nvcsw = p->nvcsw;
+ nivcsw = p->nivcsw;
+ for (;;) {
+ /*
+ * The runqueue is assigned before the actual context
+ * switch. We need to take the runqueue lock.
+ *
+ * We could check initially without the lock but it is
+ * very likely that we need to take the lock in every
+ * iteration.
+ */
+ rq = task_rq_lock(p, &flags);
+ running = task_running(rq, p);
+ task_rq_unlock(rq, &flags);
+
+ if (likely(!running))
+ break;
+ /*
+ * The switch count is incremented before the actual
+ * context switch. We thus wait for two switches to be
+ * sure at least one completed.
+ */
+ if ((p->nvcsw - nvcsw) > 1)
+ break;
+ if ((p->nivcsw - nivcsw) > 1)
+ break;
+
+ cpu_relax();
+ }
+}
+
+/*
* wait_task_inactive - wait for a thread to unschedule.
*
* If @match_state is nonzero, it's the @p->state value just checked and
diff --git a/kernel/signal.c b/kernel/signal.c
index d803473..94ec0a4 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -27,7 +27,7 @@
#include <linux/freezer.h>
#include <linux/pid_namespace.h>
#include <linux/nsproxy.h>
-#include <trace/sched.h>
+#include <trace/events/sched.h>
#include <asm/param.h>
#include <asm/uaccess.h>
@@ -41,8 +41,6 @@
static struct kmem_cache *sigqueue_cachep;
-DEFINE_TRACE(sched_signal_send);
-
static void __user *sig_handler(struct task_struct *t, int sig)
{
return t->sighand->action[sig - 1].sa.sa_handler;
diff --git a/kernel/softirq.c b/kernel/softirq.c
index b525dd3..dc4d0cf 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -24,7 +24,9 @@
#include <linux/ftrace.h>
#include <linux/smp.h>
#include <linux/tick.h>
-#include <trace/irq.h>
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/irq.h>
#include <asm/irq.h>
/*
@@ -186,9 +188,6 @@ EXPORT_SYMBOL(local_bh_enable_ip);
*/
#define MAX_SOFTIRQ_RESTART 10
-DEFINE_TRACE(softirq_entry);
-DEFINE_TRACE(softirq_exit);
-
asmlinkage void __do_softirq(void)
{
struct softirq_action *h;
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 417d198..4a13e5a 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -48,6 +48,21 @@ config FTRACE_NMI_ENTER
depends on HAVE_FTRACE_NMI_ENTER
default y
+config EVENT_TRACING
+ select CONTEXT_SWITCH_TRACER
+ bool
+
+config CONTEXT_SWITCH_TRACER
+ select MARKERS
+ bool
+
+# All tracer options should select GENERIC_TRACER. For those options that are
+# enabled by all tracers (context switch and event tracer) they select TRACING.
+# This allows those options to appear when no other tracer is selected. But the
+# options do not appear when something else selects it. We need the two options
+# GENERIC_TRACER and TRACING to avoid circular dependencies to accomplish the
+# hidding of the automatic options options.
+
config TRACING
bool
select DEBUG_FS
@@ -56,6 +71,11 @@ config TRACING
select TRACEPOINTS
select NOP_TRACER
select BINARY_PRINTF
+ select EVENT_TRACING
+
+config GENERIC_TRACER
+ bool
+ select TRACING
#
# Minimum requirements an architecture has to meet for us to
@@ -73,14 +93,20 @@ config TRACING_SUPPORT
if TRACING_SUPPORT
-menu "Tracers"
+menuconfig FTRACE
+ bool "Tracers"
+ default y if DEBUG_KERNEL
+ help
+ Enable the kernel tracing infrastructure.
+
+if FTRACE
config FUNCTION_TRACER
bool "Kernel Function Tracer"
depends on HAVE_FUNCTION_TRACER
select FRAME_POINTER
select KALLSYMS
- select TRACING
+ select GENERIC_TRACER
select CONTEXT_SWITCH_TRACER
help
Enable the kernel to trace every kernel function. This is done
@@ -104,13 +130,14 @@ config FUNCTION_GRAPH_TRACER
the return value. This is done by setting the current return
address on the current task structure into a stack of calls.
+
config IRQSOFF_TRACER
bool "Interrupts-off Latency Tracer"
default n
depends on TRACE_IRQFLAGS_SUPPORT
depends on GENERIC_TIME
select TRACE_IRQFLAGS
- select TRACING
+ select GENERIC_TRACER
select TRACER_MAX_TRACE
help
This option measures the time spent in irqs-off critical
@@ -131,7 +158,7 @@ config PREEMPT_TRACER
default n
depends on GENERIC_TIME
depends on PREEMPT
- select TRACING
+ select GENERIC_TRACER
select TRACER_MAX_TRACE
help
This option measures the time spent in preemption off critical
@@ -150,7 +177,7 @@ config PREEMPT_TRACER
config SYSPROF_TRACER
bool "Sysprof Tracer"
depends on X86
- select TRACING
+ select GENERIC_TRACER
select CONTEXT_SWITCH_TRACER
help
This tracer provides the trace needed by the 'Sysprof' userspace
@@ -158,40 +185,33 @@ config SYSPROF_TRACER
config SCHED_TRACER
bool "Scheduling Latency Tracer"
- select TRACING
+ select GENERIC_TRACER
select CONTEXT_SWITCH_TRACER
select TRACER_MAX_TRACE
help
This tracer tracks the latency of the highest priority task
to be scheduled in, starting from the point it has woken up.
-config CONTEXT_SWITCH_TRACER
- bool "Trace process context switches"
- select TRACING
- select MARKERS
- help
- This tracer gets called from the context switch and records
- all switching of tasks.
-
-config EVENT_TRACER
- bool "Trace various events in the kernel"
+config ENABLE_DEFAULT_TRACERS
+ bool "Trace process context switches and events"
+ depends on !GENERIC_TRACER
select TRACING
help
This tracer hooks to various trace points in the kernel
allowing the user to pick and choose which trace point they
- want to trace.
+ want to trace. It also includes the sched_switch tracer plugin.
config FTRACE_SYSCALLS
bool "Trace syscalls"
depends on HAVE_FTRACE_SYSCALLS
- select TRACING
+ select GENERIC_TRACER
select KALLSYMS
help
Basic tracer to catch the syscall entry and exit events.
config BOOT_TRACER
bool "Trace boot initcalls"
- select TRACING
+ select GENERIC_TRACER
select CONTEXT_SWITCH_TRACER
help
This tracer helps developers to optimize boot times: it records
@@ -207,8 +227,36 @@ config BOOT_TRACER
to enable this on bootup.
config TRACE_BRANCH_PROFILING
+ bool
+ select GENERIC_TRACER
+
+choice
+ prompt "Branch Profiling"
+ default BRANCH_PROFILE_NONE
+ help
+ The branch profiling is a software profiler. It will add hooks
+ into the C conditionals to test which path a branch takes.
+
+ The likely/unlikely profiler only looks at the conditions that
+ are annotated with a likely or unlikely macro.
+
+ The "all branch" profiler will profile every if statement in the
+ kernel. This profiler will also enable the likely/unlikely
+ profiler as well.
+
+ Either of the above profilers add a bit of overhead to the system.
+ If unsure choose "No branch profiling".
+
+config BRANCH_PROFILE_NONE
+ bool "No branch profiling"
+ help
+ No branch profiling. Branch profiling adds a bit of overhead.
+ Only enable it if you want to analyse the branching behavior.
+ Otherwise keep it disabled.
+
+config PROFILE_ANNOTATED_BRANCHES
bool "Trace likely/unlikely profiler"
- select TRACING
+ select TRACE_BRANCH_PROFILING
help
This tracer profiles all the the likely and unlikely macros
in the kernel. It will display the results in:
@@ -218,11 +266,9 @@ config TRACE_BRANCH_PROFILING
Note: this will add a significant overhead, only turn this
on if you need to profile the system's use of these macros.
- Say N if unsure.
-
config PROFILE_ALL_BRANCHES
bool "Profile all if conditionals"
- depends on TRACE_BRANCH_PROFILING
+ select TRACE_BRANCH_PROFILING
help
This tracer profiles all branch conditions. Every if ()
taken in the kernel is recorded whether it hit or miss.
@@ -230,11 +276,12 @@ config PROFILE_ALL_BRANCHES
/debugfs/tracing/profile_branch
+ This option also enables the likely/unlikely profiler.
+
This configuration, when enabled, will impose a great overhead
on the system. This should only be enabled when the system
is to be analyzed
-
- Say N if unsure.
+endchoice
config TRACING_BRANCHES
bool
@@ -261,7 +308,7 @@ config BRANCH_TRACER
config POWER_TRACER
bool "Trace power consumption behavior"
depends on X86
- select TRACING
+ select GENERIC_TRACER
help
This tracer helps developers to analyze and optimize the kernels
power management decisions, specifically the C-state and P-state
@@ -295,14 +342,14 @@ config STACK_TRACER
config HW_BRANCH_TRACER
depends on HAVE_HW_BRANCH_TRACER
bool "Trace hw branches"
- select TRACING
+ select GENERIC_TRACER
help
This tracer records all branches on the system in a circular
buffer giving access to the last N branches for each cpu.
config KMEMTRACE
bool "Trace SLAB allocations"
- select TRACING
+ select GENERIC_TRACER
help
kmemtrace provides tracing for slab allocator functions, such as
kmalloc, kfree, kmem_cache_alloc, kmem_cache_free etc.. Collected
@@ -322,7 +369,7 @@ config KMEMTRACE
config WORKQUEUE_TRACER
bool "Trace workqueues"
- select TRACING
+ select GENERIC_TRACER
help
The workqueue tracer provides some statistical informations
about each cpu workqueue thread such as the number of the
@@ -338,7 +385,7 @@ config BLK_DEV_IO_TRACE
select RELAY
select DEBUG_FS
select TRACEPOINTS
- select TRACING
+ select GENERIC_TRACER
select STACKTRACE
help
Say Y here if you want to be able to trace the block layer actions
@@ -375,6 +422,20 @@ config DYNAMIC_FTRACE
were made. If so, it runs stop_machine (stops all CPUS)
and modifies the code to jump over the call to ftrace.
+config FUNCTION_PROFILER
+ bool "Kernel function profiler"
+ depends on FUNCTION_TRACER
+ default n
+ help
+ This option enables the kernel function profiler. A file is created
+ in debugfs called function_profile_enabled which defaults to zero.
+ When a 1 is echoed into this file profiling begins, and when a
+ zero is entered, profiling stops. A file in the trace_stats
+ directory called functions, that show the list of functions that
+ have been hit and their counters.
+
+ If in doubt, say N
+
config FTRACE_MCOUNT_RECORD
def_bool y
depends on DYNAMIC_FTRACE
@@ -385,7 +446,7 @@ config FTRACE_SELFTEST
config FTRACE_STARTUP_TEST
bool "Perform a startup test on ftrace"
- depends on TRACING
+ depends on GENERIC_TRACER
select FTRACE_SELFTEST
help
This option performs a series of startup tests on ftrace. On bootup
@@ -396,7 +457,7 @@ config FTRACE_STARTUP_TEST
config MMIOTRACE
bool "Memory mapped IO tracing"
depends on HAVE_MMIOTRACE_SUPPORT && PCI
- select TRACING
+ select GENERIC_TRACER
help
Mmiotrace traces Memory Mapped I/O access and is meant for
debugging and reverse engineering. It is called from the ioremap
@@ -416,7 +477,23 @@ config MMIOTRACE_TEST
Say N, unless you absolutely know what you are doing.
-endmenu
+config RING_BUFFER_BENCHMARK
+ tristate "Ring buffer benchmark stress tester"
+ depends on RING_BUFFER
+ help
+ This option creates a test to stress the ring buffer and bench mark it.
+ It creates its own ring buffer such that it will not interfer with
+ any other users of the ring buffer (such as ftrace). It then creates
+ a producer and consumer that will run for 10 seconds and sleep for
+ 10 seconds. Each interval it will print out the number of events
+ it recorded and give a rough estimate of how long each iteration took.
+
+ It does not disable interrupts or raise its priority, so it may be
+ affected by processes that are running.
+
+ If unsure, say N
+
+endif # FTRACE
endif # TRACING_SUPPORT
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 2630f51..844164d 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -15,11 +15,17 @@ ifdef CONFIG_TRACING_BRANCHES
KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
endif
+#
+# Make the trace clocks available generally: it's infrastructure
+# relied on by ptrace for example:
+#
+obj-y += trace_clock.o
+
obj-$(CONFIG_FUNCTION_TRACER) += libftrace.o
obj-$(CONFIG_RING_BUFFER) += ring_buffer.o
+obj-$(CONFIG_RING_BUFFER_BENCHMARK) += ring_buffer_benchmark.o
obj-$(CONFIG_TRACING) += trace.o
-obj-$(CONFIG_TRACING) += trace_clock.o
obj-$(CONFIG_TRACING) += trace_output.o
obj-$(CONFIG_TRACING) += trace_stat.o
obj-$(CONFIG_TRACING) += trace_printk.o
@@ -39,12 +45,14 @@ obj-$(CONFIG_HW_BRANCH_TRACER) += trace_hw_branches.o
obj-$(CONFIG_POWER_TRACER) += trace_power.o
obj-$(CONFIG_KMEMTRACE) += kmemtrace.o
obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o
-obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
-obj-$(CONFIG_EVENT_TRACER) += trace_events.o
-obj-$(CONFIG_EVENT_TRACER) += events.o
-obj-$(CONFIG_EVENT_TRACER) += trace_export.o
+obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
+ifeq ($(CONFIG_BLOCK),y)
+obj-$(CONFIG_EVENT_TRACING) += blktrace.o
+endif
+obj-$(CONFIG_EVENT_TRACING) += trace_events.o
+obj-$(CONFIG_EVENT_TRACING) += trace_export.o
obj-$(CONFIG_FTRACE_SYSCALLS) += trace_syscalls.o
obj-$(CONFIG_EVENT_PROFILE) += trace_event_profile.o
-obj-$(CONFIG_EVENT_TRACER) += trace_events_filter.o
+obj-$(CONFIG_EVENT_TRACING) += trace_events_filter.o
libftrace-y := ftrace.o
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 921ef5d..7bd6a98 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -23,10 +23,14 @@
#include <linux/mutex.h>
#include <linux/debugfs.h>
#include <linux/time.h>
-#include <trace/block.h>
#include <linux/uaccess.h>
+
+#include <trace/events/block.h>
+
#include "trace_output.h"
+#ifdef CONFIG_BLK_DEV_IO_TRACE
+
static unsigned int blktrace_seq __read_mostly = 1;
static struct trace_array *blk_tr;
@@ -147,7 +151,7 @@ static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector,
{
if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0)
return 1;
- if (sector < bt->start_lba || sector > bt->end_lba)
+ if (sector && (sector < bt->start_lba || sector > bt->end_lba))
return 1;
if (bt->pid && pid != bt->pid)
return 1;
@@ -192,7 +196,7 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
what |= MASK_TC_BIT(rw, DISCARD);
pid = tsk->pid;
- if (unlikely(act_log_check(bt, what, sector, pid)))
+ if (act_log_check(bt, what, sector, pid))
return;
cpu = raw_smp_processor_id();
@@ -262,6 +266,7 @@ static void blk_trace_free(struct blk_trace *bt)
{
debugfs_remove(bt->msg_file);
debugfs_remove(bt->dropped_file);
+ debugfs_remove(bt->dir);
relay_close(bt->rchan);
free_percpu(bt->sequence);
free_percpu(bt->msg_data);
@@ -403,11 +408,29 @@ static struct rchan_callbacks blk_relay_callbacks = {
.remove_buf_file = blk_remove_buf_file_callback,
};
+static void blk_trace_setup_lba(struct blk_trace *bt,
+ struct block_device *bdev)
+{
+ struct hd_struct *part = NULL;
+
+ if (bdev)
+ part = bdev->bd_part;
+
+ if (part) {
+ bt->start_lba = part->start_sect;
+ bt->end_lba = part->start_sect + part->nr_sects;
+ } else {
+ bt->start_lba = 0;
+ bt->end_lba = -1ULL;
+ }
+}
+
/*
* Setup everything required to start tracing
*/
int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
- struct blk_user_trace_setup *buts)
+ struct block_device *bdev,
+ struct blk_user_trace_setup *buts)
{
struct blk_trace *old_bt, *bt = NULL;
struct dentry *dir = NULL;
@@ -480,10 +503,13 @@ int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
if (!bt->act_mask)
bt->act_mask = (u16) -1;
- bt->start_lba = buts->start_lba;
- bt->end_lba = buts->end_lba;
- if (!bt->end_lba)
- bt->end_lba = -1ULL;
+ blk_trace_setup_lba(bt, bdev);
+
+ /* overwrite with user settings */
+ if (buts->start_lba)
+ bt->start_lba = buts->start_lba;
+ if (buts->end_lba)
+ bt->end_lba = buts->end_lba;
bt->pid = buts->pid;
bt->trace_state = Blktrace_setup;
@@ -505,6 +531,7 @@ err:
}
int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
+ struct block_device *bdev,
char __user *arg)
{
struct blk_user_trace_setup buts;
@@ -514,7 +541,7 @@ int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
if (ret)
return -EFAULT;
- ret = do_blk_trace_setup(q, name, dev, &buts);
+ ret = do_blk_trace_setup(q, name, dev, bdev, &buts);
if (ret)
return ret;
@@ -582,7 +609,7 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
switch (cmd) {
case BLKTRACESETUP:
bdevname(bdev, b);
- ret = blk_trace_setup(q, b, bdev->bd_dev, arg);
+ ret = blk_trace_setup(q, b, bdev->bd_dev, bdev, arg);
break;
case BLKTRACESTART:
start = 1;
@@ -809,7 +836,6 @@ static void blk_add_trace_split(struct request_queue *q, struct bio *bio,
* @bio: the source bio
* @dev: target device
* @from: source sector
- * @to: target sector
*
* Description:
* Device mapper or raid target sometimes need to split a bio because
@@ -817,7 +843,7 @@ static void blk_add_trace_split(struct request_queue *q, struct bio *bio,
*
**/
static void blk_add_trace_remap(struct request_queue *q, struct bio *bio,
- dev_t dev, sector_t from, sector_t to)
+ dev_t dev, sector_t from)
{
struct blk_trace *bt = q->blk_trace;
struct blk_io_trace_remap r;
@@ -825,12 +851,13 @@ static void blk_add_trace_remap(struct request_queue *q, struct bio *bio,
if (likely(!bt))
return;
- r.device = cpu_to_be32(dev);
- r.device_from = cpu_to_be32(bio->bi_bdev->bd_dev);
- r.sector = cpu_to_be64(to);
+ r.device_from = cpu_to_be32(dev);
+ r.device_to = cpu_to_be32(bio->bi_bdev->bd_dev);
+ r.sector_from = cpu_to_be64(from);
- __blk_add_trace(bt, from, bio->bi_size, bio->bi_rw, BLK_TA_REMAP,
- !bio_flagged(bio, BIO_UPTODATE), sizeof(r), &r);
+ __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw,
+ BLK_TA_REMAP, !bio_flagged(bio, BIO_UPTODATE),
+ sizeof(r), &r);
}
/**
@@ -971,6 +998,16 @@ static inline const void *pdu_start(const struct trace_entry *ent)
return te_blk_io_trace(ent) + 1;
}
+static inline u32 t_action(const struct trace_entry *ent)
+{
+ return te_blk_io_trace(ent)->action;
+}
+
+static inline u32 t_bytes(const struct trace_entry *ent)
+{
+ return te_blk_io_trace(ent)->bytes;
+}
+
static inline u32 t_sec(const struct trace_entry *ent)
{
return te_blk_io_trace(ent)->bytes >> 9;
@@ -996,11 +1033,11 @@ static void get_pdu_remap(const struct trace_entry *ent,
struct blk_io_trace_remap *r)
{
const struct blk_io_trace_remap *__r = pdu_start(ent);
- __u64 sector = __r->sector;
+ __u64 sector_from = __r->sector_from;
- r->device = be32_to_cpu(__r->device);
r->device_from = be32_to_cpu(__r->device_from);
- r->sector = be64_to_cpu(sector);
+ r->device_to = be32_to_cpu(__r->device_to);
+ r->sector_from = be64_to_cpu(sector_from);
}
typedef int (blk_log_action_t) (struct trace_iterator *iter, const char *act);
@@ -1031,36 +1068,98 @@ static int blk_log_action(struct trace_iterator *iter, const char *act)
MAJOR(t->device), MINOR(t->device), act, rwbs);
}
+static int blk_log_dump_pdu(struct trace_seq *s, const struct trace_entry *ent)
+{
+ const unsigned char *pdu_buf;
+ int pdu_len;
+ int i, end, ret;
+
+ pdu_buf = pdu_start(ent);
+ pdu_len = te_blk_io_trace(ent)->pdu_len;
+
+ if (!pdu_len)
+ return 1;
+
+ /* find the last zero that needs to be printed */
+ for (end = pdu_len - 1; end >= 0; end--)
+ if (pdu_buf[end])
+ break;
+ end++;
+
+ if (!trace_seq_putc(s, '('))
+ return 0;
+
+ for (i = 0; i < pdu_len; i++) {
+
+ ret = trace_seq_printf(s, "%s%02x",
+ i == 0 ? "" : " ", pdu_buf[i]);
+ if (!ret)
+ return ret;
+
+ /*
+ * stop when the rest is just zeroes and indicate so
+ * with a ".." appended
+ */
+ if (i == end && end != pdu_len - 1)
+ return trace_seq_puts(s, " ..) ");
+ }
+
+ return trace_seq_puts(s, ") ");
+}
+
static int blk_log_generic(struct trace_seq *s, const struct trace_entry *ent)
{
char cmd[TASK_COMM_LEN];
trace_find_cmdline(ent->pid, cmd);
- if (t_sec(ent))
- return trace_seq_printf(s, "%llu + %u [%s]\n",
- t_sector(ent), t_sec(ent), cmd);
- return trace_seq_printf(s, "[%s]\n", cmd);
+ if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) {
+ int ret;
+
+ ret = trace_seq_printf(s, "%u ", t_bytes(ent));
+ if (!ret)
+ return 0;
+ ret = blk_log_dump_pdu(s, ent);
+ if (!ret)
+ return 0;
+ return trace_seq_printf(s, "[%s]\n", cmd);
+ } else {
+ if (t_sec(ent))
+ return trace_seq_printf(s, "%llu + %u [%s]\n",
+ t_sector(ent), t_sec(ent), cmd);
+ return trace_seq_printf(s, "[%s]\n", cmd);
+ }
}
static int blk_log_with_error(struct trace_seq *s,
const struct trace_entry *ent)
{
- if (t_sec(ent))
- return trace_seq_printf(s, "%llu + %u [%d]\n", t_sector(ent),
- t_sec(ent), t_error(ent));
- return trace_seq_printf(s, "%llu [%d]\n", t_sector(ent), t_error(ent));
+ if (t_action(ent) & BLK_TC_ACT(BLK_TC_PC)) {
+ int ret;
+
+ ret = blk_log_dump_pdu(s, ent);
+ if (ret)
+ return trace_seq_printf(s, "[%d]\n", t_error(ent));
+ return 0;
+ } else {
+ if (t_sec(ent))
+ return trace_seq_printf(s, "%llu + %u [%d]\n",
+ t_sector(ent),
+ t_sec(ent), t_error(ent));
+ return trace_seq_printf(s, "%llu [%d]\n",
+ t_sector(ent), t_error(ent));
+ }
}
static int blk_log_remap(struct trace_seq *s, const struct trace_entry *ent)
{
- struct blk_io_trace_remap r = { .device = 0, };
+ struct blk_io_trace_remap r = { .device_from = 0, };
get_pdu_remap(ent, &r);
return trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n",
- t_sector(ent),
- t_sec(ent), MAJOR(r.device), MINOR(r.device),
- (unsigned long long)r.sector);
+ t_sector(ent), t_sec(ent),
+ MAJOR(r.device_from), MINOR(r.device_from),
+ (unsigned long long)r.sector_from);
}
static int blk_log_plug(struct trace_seq *s, const struct trace_entry *ent)
@@ -1117,7 +1216,6 @@ static void blk_tracer_print_header(struct seq_file *m)
static void blk_tracer_start(struct trace_array *tr)
{
blk_tracer_enabled = true;
- trace_flags &= ~TRACE_ITER_CONTEXT_INFO;
}
static int blk_tracer_init(struct trace_array *tr)
@@ -1130,7 +1228,6 @@ static int blk_tracer_init(struct trace_array *tr)
static void blk_tracer_stop(struct trace_array *tr)
{
blk_tracer_enabled = false;
- trace_flags |= TRACE_ITER_CONTEXT_INFO;
}
static void blk_tracer_reset(struct trace_array *tr)
@@ -1182,7 +1279,7 @@ static enum print_line_t print_one_line(struct trace_iterator *iter,
}
if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act)))
- ret = trace_seq_printf(s, "Bad pc action %x\n", what);
+ ret = trace_seq_printf(s, "Unknown action %x\n", what);
else {
ret = log_action(iter, what2act[what].act[long_act]);
if (ret)
@@ -1195,9 +1292,6 @@ out:
static enum print_line_t blk_trace_event_print(struct trace_iterator *iter,
int flags)
{
- if (!trace_print_context(iter))
- return TRACE_TYPE_PARTIAL_LINE;
-
return print_one_line(iter, false);
}
@@ -1232,6 +1326,18 @@ static enum print_line_t blk_tracer_print_line(struct trace_iterator *iter)
return print_one_line(iter, true);
}
+static int blk_tracer_set_flag(u32 old_flags, u32 bit, int set)
+{
+ /* don't output context-info for blk_classic output */
+ if (bit == TRACE_BLK_OPT_CLASSIC) {
+ if (set)
+ trace_flags &= ~TRACE_ITER_CONTEXT_INFO;
+ else
+ trace_flags |= TRACE_ITER_CONTEXT_INFO;
+ }
+ return 0;
+}
+
static struct tracer blk_tracer __read_mostly = {
.name = "blk",
.init = blk_tracer_init,
@@ -1241,6 +1347,7 @@ static struct tracer blk_tracer __read_mostly = {
.print_header = blk_tracer_print_header,
.print_line = blk_tracer_print_line,
.flags = &blk_tracer_flags,
+ .set_flag = blk_tracer_set_flag,
};
static struct trace_event trace_blk_event = {
@@ -1285,7 +1392,8 @@ static int blk_trace_remove_queue(struct request_queue *q)
/*
* Setup everything required to start tracing
*/
-static int blk_trace_setup_queue(struct request_queue *q, dev_t dev)
+static int blk_trace_setup_queue(struct request_queue *q,
+ struct block_device *bdev)
{
struct blk_trace *old_bt, *bt = NULL;
int ret = -ENOMEM;
@@ -1298,9 +1406,10 @@ static int blk_trace_setup_queue(struct request_queue *q, dev_t dev)
if (!bt->msg_data)
goto free_bt;
- bt->dev = dev;
+ bt->dev = bdev->bd_dev;
bt->act_mask = (u16)-1;
- bt->end_lba = -1ULL;
+
+ blk_trace_setup_lba(bt, bdev);
old_bt = xchg(&q->blk_trace, bt);
if (old_bt != NULL) {
@@ -1517,7 +1626,7 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
if (attr == &dev_attr_enable) {
if (value)
- ret = blk_trace_setup_queue(q, bdev->bd_dev);
+ ret = blk_trace_setup_queue(q, bdev);
else
ret = blk_trace_remove_queue(q);
goto out_unlock_bdev;
@@ -1525,7 +1634,7 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
ret = 0;
if (q->blk_trace == NULL)
- ret = blk_trace_setup_queue(q, bdev->bd_dev);
+ ret = blk_trace_setup_queue(q, bdev);
if (ret == 0) {
if (attr == &dev_attr_act_mask)
@@ -1548,3 +1657,80 @@ out:
return ret ? ret : count;
}
+int blk_trace_init_sysfs(struct device *dev)
+{
+ return sysfs_create_group(&dev->kobj, &blk_trace_attr_group);
+}
+
+#endif /* CONFIG_BLK_DEV_IO_TRACE */
+
+#ifdef CONFIG_EVENT_TRACING
+
+void blk_dump_cmd(char *buf, struct request *rq)
+{
+ int i, end;
+ int len = rq->cmd_len;
+ unsigned char *cmd = rq->cmd;
+
+ if (!blk_pc_request(rq)) {
+ buf[0] = '\0';
+ return;
+ }
+
+ for (end = len - 1; end >= 0; end--)
+ if (cmd[end])
+ break;
+ end++;
+
+ for (i = 0; i < len; i++) {
+ buf += sprintf(buf, "%s%02x", i == 0 ? "" : " ", cmd[i]);
+ if (i == end && end != len - 1) {
+ sprintf(buf, " ..");
+ break;
+ }
+ }
+}
+
+void blk_fill_rwbs(char *rwbs, u32 rw, int bytes)
+{
+ int i = 0;
+
+ if (rw & WRITE)
+ rwbs[i++] = 'W';
+ else if (rw & 1 << BIO_RW_DISCARD)
+ rwbs[i++] = 'D';
+ else if (bytes)
+ rwbs[i++] = 'R';
+ else
+ rwbs[i++] = 'N';
+
+ if (rw & 1 << BIO_RW_AHEAD)
+ rwbs[i++] = 'A';
+ if (rw & 1 << BIO_RW_BARRIER)
+ rwbs[i++] = 'B';
+ if (rw & 1 << BIO_RW_SYNCIO)
+ rwbs[i++] = 'S';
+ if (rw & 1 << BIO_RW_META)
+ rwbs[i++] = 'M';
+
+ rwbs[i] = '\0';
+}
+
+void blk_fill_rwbs_rq(char *rwbs, struct request *rq)
+{
+ int rw = rq->cmd_flags & 0x03;
+ int bytes;
+
+ if (blk_discard_rq(rq))
+ rw |= (1 << BIO_RW_DISCARD);
+
+ if (blk_pc_request(rq))
+ bytes = rq->data_len;
+ else
+ bytes = rq->hard_nr_sectors << 9;
+
+ blk_fill_rwbs(rwbs, rw, bytes);
+}
+
+#endif /* CONFIG_EVENT_TRACING */
+
diff --git a/kernel/trace/events.c b/kernel/trace/events.c
deleted file mode 100644
index 246f2aa..0000000
--- a/kernel/trace/events.c
+++ /dev/null
@@ -1,14 +0,0 @@
-/*
- * This is the place to register all trace points as events.
- */
-
-#include <linux/stringify.h>
-
-#include <trace/trace_events.h>
-
-#include "trace_output.h"
-
-#include "trace_events_stage_1.h"
-#include "trace_events_stage_2.h"
-#include "trace_events_stage_3.h"
-
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index f1ed080..d6973df 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -29,11 +29,13 @@
#include <linux/list.h>
#include <linux/hash.h>
-#include <trace/sched.h>
+#include <trace/events/sched.h>
#include <asm/ftrace.h>
+#include <asm/setup.h>
-#include "trace.h"
+#include "trace_output.h"
+#include "trace_stat.h"
#define FTRACE_WARN_ON(cond) \
do { \
@@ -68,7 +70,7 @@ static DEFINE_MUTEX(ftrace_lock);
static struct ftrace_ops ftrace_list_end __read_mostly =
{
- .func = ftrace_stub,
+ .func = ftrace_stub,
};
static struct ftrace_ops *ftrace_list __read_mostly = &ftrace_list_end;
@@ -240,6 +242,580 @@ static void ftrace_update_pid_func(void)
#endif
}
+#ifdef CONFIG_FUNCTION_PROFILER
+struct ftrace_profile {
+ struct hlist_node node;
+ unsigned long ip;
+ unsigned long counter;
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ unsigned long long time;
+#endif
+};
+
+struct ftrace_profile_page {
+ struct ftrace_profile_page *next;
+ unsigned long index;
+ struct ftrace_profile records[];
+};
+
+struct ftrace_profile_stat {
+ atomic_t disabled;
+ struct hlist_head *hash;
+ struct ftrace_profile_page *pages;
+ struct ftrace_profile_page *start;
+ struct tracer_stat stat;
+};
+
+#define PROFILE_RECORDS_SIZE \
+ (PAGE_SIZE - offsetof(struct ftrace_profile_page, records))
+
+#define PROFILES_PER_PAGE \
+ (PROFILE_RECORDS_SIZE / sizeof(struct ftrace_profile))
+
+static int ftrace_profile_bits __read_mostly;
+static int ftrace_profile_enabled __read_mostly;
+
+/* ftrace_profile_lock - synchronize the enable and disable of the profiler */
+static DEFINE_MUTEX(ftrace_profile_lock);
+
+static DEFINE_PER_CPU(struct ftrace_profile_stat, ftrace_profile_stats);
+
+#define FTRACE_PROFILE_HASH_SIZE 1024 /* must be power of 2 */
+
+static void *
+function_stat_next(void *v, int idx)
+{
+ struct ftrace_profile *rec = v;
+ struct ftrace_profile_page *pg;
+
+ pg = (struct ftrace_profile_page *)((unsigned long)rec & PAGE_MASK);
+
+ again:
+ rec++;
+ if ((void *)rec >= (void *)&pg->records[pg->index]) {
+ pg = pg->next;
+ if (!pg)
+ return NULL;
+ rec = &pg->records[0];
+ if (!rec->counter)
+ goto again;
+ }
+
+ return rec;
+}
+
+static void *function_stat_start(struct tracer_stat *trace)
+{
+ struct ftrace_profile_stat *stat =
+ container_of(trace, struct ftrace_profile_stat, stat);
+
+ if (!stat || !stat->start)
+ return NULL;
+
+ return function_stat_next(&stat->start->records[0], 0);
+}
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+/* function graph compares on total time */
+static int function_stat_cmp(void *p1, void *p2)
+{
+ struct ftrace_profile *a = p1;
+ struct ftrace_profile *b = p2;
+
+ if (a->time < b->time)
+ return -1;
+ if (a->time > b->time)
+ return 1;
+ else
+ return 0;
+}
+#else
+/* not function graph compares against hits */
+static int function_stat_cmp(void *p1, void *p2)
+{
+ struct ftrace_profile *a = p1;
+ struct ftrace_profile *b = p2;
+
+ if (a->counter < b->counter)
+ return -1;
+ if (a->counter > b->counter)
+ return 1;
+ else
+ return 0;
+}
+#endif
+
+static int function_stat_headers(struct seq_file *m)
+{
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ seq_printf(m, " Function "
+ "Hit Time Avg\n"
+ " -------- "
+ "--- ---- ---\n");
+#else
+ seq_printf(m, " Function Hit\n"
+ " -------- ---\n");
+#endif
+ return 0;
+}
+
+static int function_stat_show(struct seq_file *m, void *v)
+{
+ struct ftrace_profile *rec = v;
+ char str[KSYM_SYMBOL_LEN];
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ static DEFINE_MUTEX(mutex);
+ static struct trace_seq s;
+ unsigned long long avg;
+#endif
+
+ kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
+ seq_printf(m, " %-30.30s %10lu", str, rec->counter);
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ seq_printf(m, " ");
+ avg = rec->time;
+ do_div(avg, rec->counter);
+
+ mutex_lock(&mutex);
+ trace_seq_init(&s);
+ trace_print_graph_duration(rec->time, &s);
+ trace_seq_puts(&s, " ");
+ trace_print_graph_duration(avg, &s);
+ trace_print_seq(m, &s);
+ mutex_unlock(&mutex);
+#endif
+ seq_putc(m, '\n');
+
+ return 0;
+}
+
+static void ftrace_profile_reset(struct ftrace_profile_stat *stat)
+{
+ struct ftrace_profile_page *pg;
+
+ pg = stat->pages = stat->start;
+
+ while (pg) {
+ memset(pg->records, 0, PROFILE_RECORDS_SIZE);
+ pg->index = 0;
+ pg = pg->next;
+ }
+
+ memset(stat->hash, 0,
+ FTRACE_PROFILE_HASH_SIZE * sizeof(struct hlist_head));
+}
+
+int ftrace_profile_pages_init(struct ftrace_profile_stat *stat)
+{
+ struct ftrace_profile_page *pg;
+ int functions;
+ int pages;
+ int i;
+
+ /* If we already allocated, do nothing */
+ if (stat->pages)
+ return 0;
+
+ stat->pages = (void *)get_zeroed_page(GFP_KERNEL);
+ if (!stat->pages)
+ return -ENOMEM;
+
+#ifdef CONFIG_DYNAMIC_FTRACE
+ functions = ftrace_update_tot_cnt;
+#else
+ /*
+ * We do not know the number of functions that exist because
+ * dynamic tracing is what counts them. With past experience
+ * we have around 20K functions. That should be more than enough.
+ * It is highly unlikely we will execute every function in
+ * the kernel.
+ */
+ functions = 20000;
+#endif
+
+ pg = stat->start = stat->pages;
+
+ pages = DIV_ROUND_UP(functions, PROFILES_PER_PAGE);
+
+ for (i = 0; i < pages; i++) {
+ pg->next = (void *)get_zeroed_page(GFP_KERNEL);
+ if (!pg->next)
+ goto out_free;
+ pg = pg->next;
+ }
+
+ return 0;
+
+ out_free:
+ pg = stat->start;
+ while (pg) {
+ unsigned long tmp = (unsigned long)pg;
+
+ pg = pg->next;
+ free_page(tmp);
+ }
+
+ free_page((unsigned long)stat->pages);
+ stat->pages = NULL;
+ stat->start = NULL;
+
+ return -ENOMEM;
+}
+
+static int ftrace_profile_init_cpu(int cpu)
+{
+ struct ftrace_profile_stat *stat;
+ int size;
+
+ stat = &per_cpu(ftrace_profile_stats, cpu);
+
+ if (stat->hash) {
+ /* If the profile is already created, simply reset it */
+ ftrace_profile_reset(stat);
+ return 0;
+ }
+
+ /*
+ * We are profiling all functions, but usually only a few thousand
+ * functions are hit. We'll make a hash of 1024 items.
+ */
+ size = FTRACE_PROFILE_HASH_SIZE;
+
+ stat->hash = kzalloc(sizeof(struct hlist_head) * size, GFP_KERNEL);
+
+ if (!stat->hash)
+ return -ENOMEM;
+
+ if (!ftrace_profile_bits) {
+ size--;
+
+ for (; size; size >>= 1)
+ ftrace_profile_bits++;
+ }
+
+ /* Preallocate the function profiling pages */
+ if (ftrace_profile_pages_init(stat) < 0) {
+ kfree(stat->hash);
+ stat->hash = NULL;
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static int ftrace_profile_init(void)
+{
+ int cpu;
+ int ret = 0;
+
+ for_each_online_cpu(cpu) {
+ ret = ftrace_profile_init_cpu(cpu);
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
+
+/* interrupts must be disabled */
+static struct ftrace_profile *
+ftrace_find_profiled_func(struct ftrace_profile_stat *stat, unsigned long ip)
+{
+ struct ftrace_profile *rec;
+ struct hlist_head *hhd;
+ struct hlist_node *n;
+ unsigned long key;
+
+ key = hash_long(ip, ftrace_profile_bits);
+ hhd = &stat->hash[key];
+
+ if (hlist_empty(hhd))
+ return NULL;
+
+ hlist_for_each_entry_rcu(rec, n, hhd, node) {
+ if (rec->ip == ip)
+ return rec;
+ }
+
+ return NULL;
+}
+
+static void ftrace_add_profile(struct ftrace_profile_stat *stat,
+ struct ftrace_profile *rec)
+{
+ unsigned long key;
+
+ key = hash_long(rec->ip, ftrace_profile_bits);
+ hlist_add_head_rcu(&rec->node, &stat->hash[key]);
+}
+
+/*
+ * The memory is already allocated, this simply finds a new record to use.
+ */
+static struct ftrace_profile *
+ftrace_profile_alloc(struct ftrace_profile_stat *stat, unsigned long ip)
+{
+ struct ftrace_profile *rec = NULL;
+
+ /* prevent recursion (from NMIs) */
+ if (atomic_inc_return(&stat->disabled) != 1)
+ goto out;
+
+ /*
+ * Try to find the function again since an NMI
+ * could have added it
+ */
+ rec = ftrace_find_profiled_func(stat, ip);
+ if (rec)
+ goto out;
+
+ if (stat->pages->index == PROFILES_PER_PAGE) {
+ if (!stat->pages->next)
+ goto out;
+ stat->pages = stat->pages->next;
+ }
+
+ rec = &stat->pages->records[stat->pages->index++];
+ rec->ip = ip;
+ ftrace_add_profile(stat, rec);
+
+ out:
+ atomic_dec(&stat->disabled);
+
+ return rec;
+}
+
+static void
+function_profile_call(unsigned long ip, unsigned long parent_ip)
+{
+ struct ftrace_profile_stat *stat;
+ struct ftrace_profile *rec;
+ unsigned long flags;
+
+ if (!ftrace_profile_enabled)
+ return;
+
+ local_irq_save(flags);
+
+ stat = &__get_cpu_var(ftrace_profile_stats);
+ if (!stat->hash || !ftrace_profile_enabled)
+ goto out;
+
+ rec = ftrace_find_profiled_func(stat, ip);
+ if (!rec) {
+ rec = ftrace_profile_alloc(stat, ip);
+ if (!rec)
+ goto out;
+ }
+
+ rec->counter++;
+ out:
+ local_irq_restore(flags);
+}
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+static int profile_graph_entry(struct ftrace_graph_ent *trace)
+{
+ function_profile_call(trace->func, 0);
+ return 1;
+}
+
+static void profile_graph_return(struct ftrace_graph_ret *trace)
+{
+ struct ftrace_profile_stat *stat;
+ unsigned long long calltime;
+ struct ftrace_profile *rec;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ stat = &__get_cpu_var(ftrace_profile_stats);
+ if (!stat->hash || !ftrace_profile_enabled)
+ goto out;
+
+ calltime = trace->rettime - trace->calltime;
+
+ if (!(trace_flags & TRACE_ITER_GRAPH_TIME)) {
+ int index;
+
+ index = trace->depth;
+
+ /* Append this call time to the parent time to subtract */
+ if (index)
+ current->ret_stack[index - 1].subtime += calltime;
+
+ if (current->ret_stack[index].subtime < calltime)
+ calltime -= current->ret_stack[index].subtime;
+ else
+ calltime = 0;
+ }
+
+ rec = ftrace_find_profiled_func(stat, trace->func);
+ if (rec)
+ rec->time += calltime;
+
+ out:
+ local_irq_restore(flags);
+}
+
+static int register_ftrace_profiler(void)
+{
+ return register_ftrace_graph(&profile_graph_return,
+ &profile_graph_entry);
+}
+
+static void unregister_ftrace_profiler(void)
+{
+ unregister_ftrace_graph();
+}
+#else
+static struct ftrace_ops ftrace_profile_ops __read_mostly =
+{
+ .func = function_profile_call,
+};
+
+static int register_ftrace_profiler(void)
+{
+ return register_ftrace_function(&ftrace_profile_ops);
+}
+
+static void unregister_ftrace_profiler(void)
+{
+ unregister_ftrace_function(&ftrace_profile_ops);
+}
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+
+static ssize_t
+ftrace_profile_write(struct file *filp, const char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ unsigned long val;
+ char buf[64]; /* big enough to hold a number */
+ int ret;
+
+ if (cnt >= sizeof(buf))
+ return -EINVAL;
+
+ if (copy_from_user(&buf, ubuf, cnt))
+ return -EFAULT;
+
+ buf[cnt] = 0;
+
+ ret = strict_strtoul(buf, 10, &val);
+ if (ret < 0)
+ return ret;
+
+ val = !!val;
+
+ mutex_lock(&ftrace_profile_lock);
+ if (ftrace_profile_enabled ^ val) {
+ if (val) {
+ ret = ftrace_profile_init();
+ if (ret < 0) {
+ cnt = ret;
+ goto out;
+ }
+
+ ret = register_ftrace_profiler();
+ if (ret < 0) {
+ cnt = ret;
+ goto out;
+ }
+ ftrace_profile_enabled = 1;
+ } else {
+ ftrace_profile_enabled = 0;
+ /*
+ * unregister_ftrace_profiler calls stop_machine
+ * so this acts like an synchronize_sched.
+ */
+ unregister_ftrace_profiler();
+ }
+ }
+ out:
+ mutex_unlock(&ftrace_profile_lock);
+
+ filp->f_pos += cnt;
+
+ return cnt;
+}
+
+static ssize_t
+ftrace_profile_read(struct file *filp, char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ char buf[64]; /* big enough to hold a number */
+ int r;
+
+ r = sprintf(buf, "%u\n", ftrace_profile_enabled);
+ return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+}
+
+static const struct file_operations ftrace_profile_fops = {
+ .open = tracing_open_generic,
+ .read = ftrace_profile_read,
+ .write = ftrace_profile_write,
+};
+
+/* used to initialize the real stat files */
+static struct tracer_stat function_stats __initdata = {
+ .name = "functions",
+ .stat_start = function_stat_start,
+ .stat_next = function_stat_next,
+ .stat_cmp = function_stat_cmp,
+ .stat_headers = function_stat_headers,
+ .stat_show = function_stat_show
+};
+
+static void ftrace_profile_debugfs(struct dentry *d_tracer)
+{
+ struct ftrace_profile_stat *stat;
+ struct dentry *entry;
+ char *name;
+ int ret;
+ int cpu;
+
+ for_each_possible_cpu(cpu) {
+ stat = &per_cpu(ftrace_profile_stats, cpu);
+
+ /* allocate enough for function name + cpu number */
+ name = kmalloc(32, GFP_KERNEL);
+ if (!name) {
+ /*
+ * The files created are permanent, if something happens
+ * we still do not free memory.
+ */
+ kfree(stat);
+ WARN(1,
+ "Could not allocate stat file for cpu %d\n",
+ cpu);
+ return;
+ }
+ stat->stat = function_stats;
+ snprintf(name, 32, "function%d", cpu);
+ stat->stat.name = name;
+ ret = register_stat_tracer(&stat->stat);
+ if (ret) {
+ WARN(1,
+ "Could not register function stat for cpu %d\n",
+ cpu);
+ kfree(name);
+ return;
+ }
+ }
+
+ entry = debugfs_create_file("function_profile_enabled", 0644,
+ d_tracer, NULL, &ftrace_profile_fops);
+ if (!entry)
+ pr_warning("Could not create debugfs "
+ "'function_profile_enabled' entry\n");
+}
+
+#else /* CONFIG_FUNCTION_PROFILER */
+static void ftrace_profile_debugfs(struct dentry *d_tracer)
+{
+}
+#endif /* CONFIG_FUNCTION_PROFILER */
+
/* set when tracing only a pid */
struct pid *ftrace_pid_trace;
static struct pid * const ftrace_swapper_pid = &init_struct_pid;
@@ -261,7 +837,6 @@ struct ftrace_func_probe {
struct rcu_head rcu;
};
-
enum {
FTRACE_ENABLE_CALLS = (1 << 0),
FTRACE_DISABLE_CALLS = (1 << 1),
@@ -346,30 +921,6 @@ static void ftrace_free_rec(struct dyn_ftrace *rec)
rec->flags |= FTRACE_FL_FREE;
}
-void ftrace_release(void *start, unsigned long size)
-{
- struct dyn_ftrace *rec;
- struct ftrace_page *pg;
- unsigned long s = (unsigned long)start;
- unsigned long e = s + size;
-
- if (ftrace_disabled || !start)
- return;
-
- mutex_lock(&ftrace_lock);
- do_for_each_ftrace_rec(pg, rec) {
- if ((rec->ip >= s) && (rec->ip < e)) {
- /*
- * rec->ip is changed in ftrace_free_rec()
- * It should not between s and e if record was freed.
- */
- FTRACE_WARN_ON(rec->flags & FTRACE_FL_FREE);
- ftrace_free_rec(rec);
- }
- } while_for_each_ftrace_rec();
- mutex_unlock(&ftrace_lock);
-}
-
static struct dyn_ftrace *ftrace_alloc_dyn_node(unsigned long ip)
{
struct dyn_ftrace *rec;
@@ -1408,7 +1959,7 @@ function_trace_probe_call(unsigned long ip, unsigned long parent_ip)
static struct ftrace_ops trace_probe_ops __read_mostly =
{
- .func = function_trace_probe_call,
+ .func = function_trace_probe_call,
};
static int ftrace_probe_registered;
@@ -1823,6 +2374,45 @@ void ftrace_set_notrace(unsigned char *buf, int len, int reset)
ftrace_set_regex(buf, len, reset, 0);
}
+/*
+ * command line interface to allow users to set filters on boot up.
+ */
+#define FTRACE_FILTER_SIZE COMMAND_LINE_SIZE
+static char ftrace_notrace_buf[FTRACE_FILTER_SIZE] __initdata;
+static char ftrace_filter_buf[FTRACE_FILTER_SIZE] __initdata;
+
+static int __init set_ftrace_notrace(char *str)
+{
+ strncpy(ftrace_notrace_buf, str, FTRACE_FILTER_SIZE);
+ return 1;
+}
+__setup("ftrace_notrace=", set_ftrace_notrace);
+
+static int __init set_ftrace_filter(char *str)
+{
+ strncpy(ftrace_filter_buf, str, FTRACE_FILTER_SIZE);
+ return 1;
+}
+__setup("ftrace_filter=", set_ftrace_filter);
+
+static void __init set_ftrace_early_filter(char *buf, int enable)
+{
+ char *func;
+
+ while (buf) {
+ func = strsep(&buf, ",");
+ ftrace_set_regex(func, strlen(func), 0, enable);
+ }
+}
+
+static void __init set_ftrace_early_filters(void)
+{
+ if (ftrace_filter_buf[0])
+ set_ftrace_early_filter(ftrace_filter_buf, 1);
+ if (ftrace_notrace_buf[0])
+ set_ftrace_early_filter(ftrace_notrace_buf, 0);
+}
+
static int
ftrace_regex_release(struct inode *inode, struct file *file, int enable)
{
@@ -2128,38 +2718,23 @@ static const struct file_operations ftrace_graph_fops = {
static __init int ftrace_init_dyn_debugfs(struct dentry *d_tracer)
{
- struct dentry *entry;
- entry = debugfs_create_file("available_filter_functions", 0444,
- d_tracer, NULL, &ftrace_avail_fops);
- if (!entry)
- pr_warning("Could not create debugfs "
- "'available_filter_functions' entry\n");
+ trace_create_file("available_filter_functions", 0444,
+ d_tracer, NULL, &ftrace_avail_fops);
- entry = debugfs_create_file("failures", 0444,
- d_tracer, NULL, &ftrace_failures_fops);
- if (!entry)
- pr_warning("Could not create debugfs 'failures' entry\n");
+ trace_create_file("failures", 0444,
+ d_tracer, NULL, &ftrace_failures_fops);
- entry = debugfs_create_file("set_ftrace_filter", 0644, d_tracer,
- NULL, &ftrace_filter_fops);
- if (!entry)
- pr_warning("Could not create debugfs "
- "'set_ftrace_filter' entry\n");
+ trace_create_file("set_ftrace_filter", 0644, d_tracer,
+ NULL, &ftrace_filter_fops);
- entry = debugfs_create_file("set_ftrace_notrace", 0644, d_tracer,
+ trace_create_file("set_ftrace_notrace", 0644, d_tracer,
NULL, &ftrace_notrace_fops);
- if (!entry)
- pr_warning("Could not create debugfs "
- "'set_ftrace_notrace' entry\n");
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
- entry = debugfs_create_file("set_graph_function", 0444, d_tracer,
+ trace_create_file("set_graph_function", 0444, d_tracer,
NULL,
&ftrace_graph_fops);
- if (!entry)
- pr_warning("Could not create debugfs "
- "'set_graph_function' entry\n");
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
return 0;
@@ -2197,14 +2772,72 @@ static int ftrace_convert_nops(struct module *mod,
return 0;
}
-void ftrace_init_module(struct module *mod,
- unsigned long *start, unsigned long *end)
+#ifdef CONFIG_MODULES
+void ftrace_release(void *start, void *end)
+{
+ struct dyn_ftrace *rec;
+ struct ftrace_page *pg;
+ unsigned long s = (unsigned long)start;
+ unsigned long e = (unsigned long)end;
+
+ if (ftrace_disabled || !start || start == end)
+ return;
+
+ mutex_lock(&ftrace_lock);
+ do_for_each_ftrace_rec(pg, rec) {
+ if ((rec->ip >= s) && (rec->ip < e)) {
+ /*
+ * rec->ip is changed in ftrace_free_rec()
+ * It should not between s and e if record was freed.
+ */
+ FTRACE_WARN_ON(rec->flags & FTRACE_FL_FREE);
+ ftrace_free_rec(rec);
+ }
+ } while_for_each_ftrace_rec();
+ mutex_unlock(&ftrace_lock);
+}
+
+static void ftrace_init_module(struct module *mod,
+ unsigned long *start, unsigned long *end)
{
if (ftrace_disabled || start == end)
return;
ftrace_convert_nops(mod, start, end);
}
+static int ftrace_module_notify(struct notifier_block *self,
+ unsigned long val, void *data)
+{
+ struct module *mod = data;
+
+ switch (val) {
+ case MODULE_STATE_COMING:
+ ftrace_init_module(mod, mod->ftrace_callsites,
+ mod->ftrace_callsites +
+ mod->num_ftrace_callsites);
+ break;
+ case MODULE_STATE_GOING:
+ ftrace_release(mod->ftrace_callsites,
+ mod->ftrace_callsites +
+ mod->num_ftrace_callsites);
+ break;
+ }
+
+ return 0;
+}
+#else
+static int ftrace_module_notify(struct notifier_block *self,
+ unsigned long val, void *data)
+{
+ return 0;
+}
+#endif /* CONFIG_MODULES */
+
+struct notifier_block ftrace_module_nb = {
+ .notifier_call = ftrace_module_notify,
+ .priority = 0,
+};
+
extern unsigned long __start_mcount_loc[];
extern unsigned long __stop_mcount_loc[];
@@ -2236,6 +2869,12 @@ void __init ftrace_init(void)
__start_mcount_loc,
__stop_mcount_loc);
+ ret = register_module_notifier(&ftrace_module_nb);
+ if (ret)
+ pr_warning("Failed to register trace ftrace module notifier\n");
+
+ set_ftrace_early_filters();
+
return;
failed:
ftrace_disabled = 1;
@@ -2417,7 +3056,6 @@ static const struct file_operations ftrace_pid_fops = {
static __init int ftrace_init_debugfs(void)
{
struct dentry *d_tracer;
- struct dentry *entry;
d_tracer = tracing_init_dentry();
if (!d_tracer)
@@ -2425,11 +3063,11 @@ static __init int ftrace_init_debugfs(void)
ftrace_init_dyn_debugfs(d_tracer);
- entry = debugfs_create_file("set_ftrace_pid", 0644, d_tracer,
- NULL, &ftrace_pid_fops);
- if (!entry)
- pr_warning("Could not create debugfs "
- "'set_ftrace_pid' entry\n");
+ trace_create_file("set_ftrace_pid", 0644, d_tracer,
+ NULL, &ftrace_pid_fops);
+
+ ftrace_profile_debugfs(d_tracer);
+
return 0;
}
fs_initcall(ftrace_init_debugfs);
@@ -2538,7 +3176,7 @@ ftrace_enable_sysctl(struct ctl_table *table, int write,
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-static atomic_t ftrace_graph_active;
+static int ftrace_graph_active;
static struct notifier_block ftrace_suspend_notifier;
int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace)
@@ -2690,7 +3328,7 @@ int register_ftrace_graph(trace_func_graph_ret_t retfunc,
mutex_lock(&ftrace_lock);
/* we currently allow only one tracer registered at a time */
- if (atomic_read(&ftrace_graph_active)) {
+ if (ftrace_graph_active) {
ret = -EBUSY;
goto out;
}
@@ -2698,10 +3336,10 @@ int register_ftrace_graph(trace_func_graph_ret_t retfunc,
ftrace_suspend_notifier.notifier_call = ftrace_suspend_notifier_call;
register_pm_notifier(&ftrace_suspend_notifier);
- atomic_inc(&ftrace_graph_active);
+ ftrace_graph_active++;
ret = start_graph_tracing();
if (ret) {
- atomic_dec(&ftrace_graph_active);
+ ftrace_graph_active--;
goto out;
}
@@ -2719,10 +3357,10 @@ void unregister_ftrace_graph(void)
{
mutex_lock(&ftrace_lock);
- if (!unlikely(atomic_read(&ftrace_graph_active)))
+ if (unlikely(!ftrace_graph_active))
goto out;
- atomic_dec(&ftrace_graph_active);
+ ftrace_graph_active--;
unregister_trace_sched_switch(ftrace_graph_probe_sched_switch);
ftrace_graph_return = (trace_func_graph_ret_t)ftrace_stub;
ftrace_graph_entry = ftrace_graph_entry_stub;
@@ -2736,7 +3374,7 @@ void unregister_ftrace_graph(void)
/* Allocate a return stack for newly created task */
void ftrace_graph_init_task(struct task_struct *t)
{
- if (atomic_read(&ftrace_graph_active)) {
+ if (ftrace_graph_active) {
t->ret_stack = kmalloc(FTRACE_RETFUNC_DEPTH
* sizeof(struct ftrace_ret_stack),
GFP_KERNEL);
diff --git a/kernel/trace/kmemtrace.c b/kernel/trace/kmemtrace.c
index 5011f4d..86cdf67 100644
--- a/kernel/trace/kmemtrace.c
+++ b/kernel/trace/kmemtrace.c
@@ -12,7 +12,7 @@
#include <linux/dcache.h>
#include <linux/fs.h>
-#include <trace/kmemtrace.h>
+#include <linux/kmemtrace.h>
#include "trace_output.h"
#include "trace.h"
@@ -42,6 +42,7 @@ static inline void kmemtrace_alloc(enum kmemtrace_type_id type_id,
gfp_t gfp_flags,
int node)
{
+ struct ftrace_event_call *call = &event_kmem_alloc;
struct trace_array *tr = kmemtrace_array;
struct kmemtrace_alloc_entry *entry;
struct ring_buffer_event *event;
@@ -62,7 +63,8 @@ static inline void kmemtrace_alloc(enum kmemtrace_type_id type_id,
entry->gfp_flags = gfp_flags;
entry->node = node;
- ring_buffer_unlock_commit(tr->buffer, event);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ ring_buffer_unlock_commit(tr->buffer, event);
trace_wake_up();
}
@@ -71,6 +73,7 @@ static inline void kmemtrace_free(enum kmemtrace_type_id type_id,
unsigned long call_site,
const void *ptr)
{
+ struct ftrace_event_call *call = &event_kmem_free;
struct trace_array *tr = kmemtrace_array;
struct kmemtrace_free_entry *entry;
struct ring_buffer_event *event;
@@ -86,7 +89,8 @@ static inline void kmemtrace_free(enum kmemtrace_type_id type_id,
entry->call_site = call_site;
entry->ptr = ptr;
- ring_buffer_unlock_commit(tr->buffer, event);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ ring_buffer_unlock_commit(tr->buffer, event);
trace_wake_up();
}
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 960cbf4..2e642b2 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -22,6 +22,28 @@
#include "trace.h"
/*
+ * The ring buffer header is special. We must manually up keep it.
+ */
+int ring_buffer_print_entry_header(struct trace_seq *s)
+{
+ int ret;
+
+ ret = trace_seq_printf(s, "# compressed entry header\n");
+ ret = trace_seq_printf(s, "\ttype_len : 5 bits\n");
+ ret = trace_seq_printf(s, "\ttime_delta : 27 bits\n");
+ ret = trace_seq_printf(s, "\tarray : 32 bits\n");
+ ret = trace_seq_printf(s, "\n");
+ ret = trace_seq_printf(s, "\tpadding : type == %d\n",
+ RINGBUF_TYPE_PADDING);
+ ret = trace_seq_printf(s, "\ttime_extend : type == %d\n",
+ RINGBUF_TYPE_TIME_EXTEND);
+ ret = trace_seq_printf(s, "\tdata max type_len == %d\n",
+ RINGBUF_TYPE_DATA_TYPE_LEN_MAX);
+
+ return ret;
+}
+
+/*
* The ring buffer is made up of a list of pages. A separate list of pages is
* allocated for each CPU. A writer may only write to a buffer that is
* associated with the CPU it is currently executing on. A reader may read
@@ -182,7 +204,10 @@ EXPORT_SYMBOL_GPL(tracing_is_on);
#define RB_EVNT_HDR_SIZE (offsetof(struct ring_buffer_event, array))
#define RB_ALIGNMENT 4U
-#define RB_MAX_SMALL_DATA 28
+#define RB_MAX_SMALL_DATA (RB_ALIGNMENT * RINGBUF_TYPE_DATA_TYPE_LEN_MAX)
+
+/* define RINGBUF_TYPE_DATA for 'case RINGBUF_TYPE_DATA:' */
+#define RINGBUF_TYPE_DATA 0 ... RINGBUF_TYPE_DATA_TYPE_LEN_MAX
enum {
RB_LEN_TIME_EXTEND = 8,
@@ -191,48 +216,28 @@ enum {
static inline int rb_null_event(struct ring_buffer_event *event)
{
- return event->type == RINGBUF_TYPE_PADDING && event->time_delta == 0;
+ return event->type_len == RINGBUF_TYPE_PADDING
+ && event->time_delta == 0;
}
static inline int rb_discarded_event(struct ring_buffer_event *event)
{
- return event->type == RINGBUF_TYPE_PADDING && event->time_delta;
+ return event->type_len == RINGBUF_TYPE_PADDING && event->time_delta;
}
static void rb_event_set_padding(struct ring_buffer_event *event)
{
- event->type = RINGBUF_TYPE_PADDING;
+ event->type_len = RINGBUF_TYPE_PADDING;
event->time_delta = 0;
}
-/**
- * ring_buffer_event_discard - discard an event in the ring buffer
- * @buffer: the ring buffer
- * @event: the event to discard
- *
- * Sometimes a event that is in the ring buffer needs to be ignored.
- * This function lets the user discard an event in the ring buffer
- * and then that event will not be read later.
- *
- * Note, it is up to the user to be careful with this, and protect
- * against races. If the user discards an event that has been consumed
- * it is possible that it could corrupt the ring buffer.
- */
-void ring_buffer_event_discard(struct ring_buffer_event *event)
-{
- event->type = RINGBUF_TYPE_PADDING;
- /* time delta must be non zero */
- if (!event->time_delta)
- event->time_delta = 1;
-}
-
static unsigned
rb_event_data_length(struct ring_buffer_event *event)
{
unsigned length;
- if (event->len)
- length = event->len * RB_ALIGNMENT;
+ if (event->type_len)
+ length = event->type_len * RB_ALIGNMENT;
else
length = event->array[0];
return length + RB_EVNT_HDR_SIZE;
@@ -242,12 +247,12 @@ rb_event_data_length(struct ring_buffer_event *event)
static unsigned
rb_event_length(struct ring_buffer_event *event)
{
- switch (event->type) {
+ switch (event->type_len) {
case RINGBUF_TYPE_PADDING:
if (rb_null_event(event))
/* undefined */
return -1;
- return rb_event_data_length(event);
+ return event->array[0] + RB_EVNT_HDR_SIZE;
case RINGBUF_TYPE_TIME_EXTEND:
return RB_LEN_TIME_EXTEND;
@@ -271,7 +276,7 @@ rb_event_length(struct ring_buffer_event *event)
unsigned ring_buffer_event_length(struct ring_buffer_event *event)
{
unsigned length = rb_event_length(event);
- if (event->type != RINGBUF_TYPE_DATA)
+ if (event->type_len > RINGBUF_TYPE_DATA_TYPE_LEN_MAX)
return length;
length -= RB_EVNT_HDR_SIZE;
if (length > RB_MAX_SMALL_DATA + sizeof(event->array[0]))
@@ -284,9 +289,9 @@ EXPORT_SYMBOL_GPL(ring_buffer_event_length);
static void *
rb_event_data(struct ring_buffer_event *event)
{
- BUG_ON(event->type != RINGBUF_TYPE_DATA);
+ BUG_ON(event->type_len > RINGBUF_TYPE_DATA_TYPE_LEN_MAX);
/* If length is in len field, then array[0] has the data */
- if (event->len)
+ if (event->type_len)
return (void *)&event->array[0];
/* Otherwise length is in array[0] and array[1] has the data */
return (void *)&event->array[1];
@@ -316,9 +321,10 @@ struct buffer_data_page {
};
struct buffer_page {
+ struct list_head list; /* list of buffer pages */
local_t write; /* index for next write */
unsigned read; /* index for next read */
- struct list_head list; /* list of free pages */
+ local_t entries; /* entries on this page */
struct buffer_data_page *page; /* Actual data page */
};
@@ -361,6 +367,34 @@ static inline int test_time_stamp(u64 delta)
#define BUF_PAGE_SIZE (PAGE_SIZE - BUF_PAGE_HDR_SIZE)
+/* Max payload is BUF_PAGE_SIZE - header (8bytes) */
+#define BUF_MAX_DATA_SIZE (BUF_PAGE_SIZE - (sizeof(u32) * 2))
+
+/* Max number of timestamps that can fit on a page */
+#define RB_TIMESTAMPS_PER_PAGE (BUF_PAGE_SIZE / RB_LEN_TIME_STAMP)
+
+int ring_buffer_print_page_header(struct trace_seq *s)
+{
+ struct buffer_data_page field;
+ int ret;
+
+ ret = trace_seq_printf(s, "\tfield: u64 timestamp;\t"
+ "offset:0;\tsize:%u;\n",
+ (unsigned int)sizeof(field.time_stamp));
+
+ ret = trace_seq_printf(s, "\tfield: local_t commit;\t"
+ "offset:%u;\tsize:%u;\n",
+ (unsigned int)offsetof(typeof(field), commit),
+ (unsigned int)sizeof(field.commit));
+
+ ret = trace_seq_printf(s, "\tfield: char data;\t"
+ "offset:%u;\tsize:%u;\n",
+ (unsigned int)offsetof(typeof(field), data),
+ (unsigned int)BUF_PAGE_SIZE);
+
+ return ret;
+}
+
/*
* head_page == tail_page && head == tail then buffer is empty.
*/
@@ -375,8 +409,11 @@ struct ring_buffer_per_cpu {
struct buffer_page *tail_page; /* write to tail */
struct buffer_page *commit_page; /* committed pages */
struct buffer_page *reader_page;
+ unsigned long nmi_dropped;
+ unsigned long commit_overrun;
unsigned long overrun;
- unsigned long entries;
+ unsigned long read;
+ local_t entries;
u64 write_stamp;
u64 read_stamp;
atomic_t record_disabled;
@@ -389,6 +426,8 @@ struct ring_buffer {
atomic_t record_disabled;
cpumask_var_t cpumask;
+ struct lock_class_key *reader_lock_key;
+
struct mutex mutex;
struct ring_buffer_per_cpu **buffers;
@@ -420,13 +459,18 @@ struct ring_buffer_iter {
/* Up this if you want to test the TIME_EXTENTS and normalization */
#define DEBUG_SHIFT 0
+static inline u64 rb_time_stamp(struct ring_buffer *buffer, int cpu)
+{
+ /* shift to debug/test normalization and TIME_EXTENTS */
+ return buffer->clock() << DEBUG_SHIFT;
+}
+
u64 ring_buffer_time_stamp(struct ring_buffer *buffer, int cpu)
{
u64 time;
preempt_disable_notrace();
- /* shift to debug/test normalization and TIME_EXTENTS */
- time = buffer->clock() << DEBUG_SHIFT;
+ time = rb_time_stamp(buffer, cpu);
preempt_enable_no_resched_notrace();
return time;
@@ -523,6 +567,7 @@ rb_allocate_cpu_buffer(struct ring_buffer *buffer, int cpu)
cpu_buffer->cpu = cpu;
cpu_buffer->buffer = buffer;
spin_lock_init(&cpu_buffer->reader_lock);
+ lockdep_set_class(&cpu_buffer->reader_lock, buffer->reader_lock_key);
cpu_buffer->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
INIT_LIST_HEAD(&cpu_buffer->pages);
@@ -593,7 +638,8 @@ static int rb_cpu_notify(struct notifier_block *self,
* when the buffer wraps. If this flag is not set, the buffer will
* drop data when the tail hits the head.
*/
-struct ring_buffer *ring_buffer_alloc(unsigned long size, unsigned flags)
+struct ring_buffer *__ring_buffer_alloc(unsigned long size, unsigned flags,
+ struct lock_class_key *key)
{
struct ring_buffer *buffer;
int bsize;
@@ -616,6 +662,7 @@ struct ring_buffer *ring_buffer_alloc(unsigned long size, unsigned flags)
buffer->pages = DIV_ROUND_UP(size, BUF_PAGE_SIZE);
buffer->flags = flags;
buffer->clock = trace_clock_local;
+ buffer->reader_lock_key = key;
/* need at least two pages */
if (buffer->pages == 1)
@@ -673,7 +720,7 @@ struct ring_buffer *ring_buffer_alloc(unsigned long size, unsigned flags)
kfree(buffer);
return NULL;
}
-EXPORT_SYMBOL_GPL(ring_buffer_alloc);
+EXPORT_SYMBOL_GPL(__ring_buffer_alloc);
/**
* ring_buffer_free - free a ring buffer.
@@ -947,31 +994,6 @@ static inline unsigned rb_head_size(struct ring_buffer_per_cpu *cpu_buffer)
return rb_page_commit(cpu_buffer->head_page);
}
-/*
- * When the tail hits the head and the buffer is in overwrite mode,
- * the head jumps to the next page and all content on the previous
- * page is discarded. But before doing so, we update the overrun
- * variable of the buffer.
- */
-static void rb_update_overflow(struct ring_buffer_per_cpu *cpu_buffer)
-{
- struct ring_buffer_event *event;
- unsigned long head;
-
- for (head = 0; head < rb_head_size(cpu_buffer);
- head += rb_event_length(event)) {
-
- event = __rb_page_index(cpu_buffer->head_page, head);
- if (RB_WARN_ON(cpu_buffer, rb_null_event(event)))
- return;
- /* Only count data entries */
- if (event->type != RINGBUF_TYPE_DATA)
- continue;
- cpu_buffer->overrun++;
- cpu_buffer->entries--;
- }
-}
-
static inline void rb_inc_page(struct ring_buffer_per_cpu *cpu_buffer,
struct buffer_page **bpage)
{
@@ -991,7 +1013,7 @@ rb_event_index(struct ring_buffer_event *event)
return (addr & ~PAGE_MASK) - (PAGE_SIZE - BUF_PAGE_SIZE);
}
-static int
+static inline int
rb_is_commit(struct ring_buffer_per_cpu *cpu_buffer,
struct ring_buffer_event *event)
{
@@ -1110,28 +1132,21 @@ static void
rb_update_event(struct ring_buffer_event *event,
unsigned type, unsigned length)
{
- event->type = type;
+ event->type_len = type;
switch (type) {
case RINGBUF_TYPE_PADDING:
- break;
-
case RINGBUF_TYPE_TIME_EXTEND:
- event->len = DIV_ROUND_UP(RB_LEN_TIME_EXTEND, RB_ALIGNMENT);
- break;
-
case RINGBUF_TYPE_TIME_STAMP:
- event->len = DIV_ROUND_UP(RB_LEN_TIME_STAMP, RB_ALIGNMENT);
break;
- case RINGBUF_TYPE_DATA:
+ case 0:
length -= RB_EVNT_HDR_SIZE;
- if (length > RB_MAX_SMALL_DATA) {
- event->len = 0;
+ if (length > RB_MAX_SMALL_DATA)
event->array[0] = length;
- } else
- event->len = DIV_ROUND_UP(length, RB_ALIGNMENT);
+ else
+ event->type_len = DIV_ROUND_UP(length, RB_ALIGNMENT);
break;
default:
BUG();
@@ -1155,131 +1170,156 @@ static unsigned rb_calculate_event_length(unsigned length)
return length;
}
+
static struct ring_buffer_event *
-__rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
- unsigned type, unsigned long length, u64 *ts)
+rb_move_tail(struct ring_buffer_per_cpu *cpu_buffer,
+ unsigned long length, unsigned long tail,
+ struct buffer_page *commit_page,
+ struct buffer_page *tail_page, u64 *ts)
{
- struct buffer_page *tail_page, *head_page, *reader_page, *commit_page;
- unsigned long tail, write;
+ struct buffer_page *next_page, *head_page, *reader_page;
struct ring_buffer *buffer = cpu_buffer->buffer;
struct ring_buffer_event *event;
- unsigned long flags;
bool lock_taken = false;
+ unsigned long flags;
- commit_page = cpu_buffer->commit_page;
- /* we just need to protect against interrupts */
- barrier();
- tail_page = cpu_buffer->tail_page;
- write = local_add_return(length, &tail_page->write);
- tail = write - length;
+ next_page = tail_page;
- /* See if we shot pass the end of this buffer page */
- if (write > BUF_PAGE_SIZE) {
- struct buffer_page *next_page = tail_page;
+ local_irq_save(flags);
+ /*
+ * Since the write to the buffer is still not
+ * fully lockless, we must be careful with NMIs.
+ * The locks in the writers are taken when a write
+ * crosses to a new page. The locks protect against
+ * races with the readers (this will soon be fixed
+ * with a lockless solution).
+ *
+ * Because we can not protect against NMIs, and we
+ * want to keep traces reentrant, we need to manage
+ * what happens when we are in an NMI.
+ *
+ * NMIs can happen after we take the lock.
+ * If we are in an NMI, only take the lock
+ * if it is not already taken. Otherwise
+ * simply fail.
+ */
+ if (unlikely(in_nmi())) {
+ if (!__raw_spin_trylock(&cpu_buffer->lock)) {
+ cpu_buffer->nmi_dropped++;
+ goto out_reset;
+ }
+ } else
+ __raw_spin_lock(&cpu_buffer->lock);
- local_irq_save(flags);
- /*
- * Since the write to the buffer is still not
- * fully lockless, we must be careful with NMIs.
- * The locks in the writers are taken when a write
- * crosses to a new page. The locks protect against
- * races with the readers (this will soon be fixed
- * with a lockless solution).
- *
- * Because we can not protect against NMIs, and we
- * want to keep traces reentrant, we need to manage
- * what happens when we are in an NMI.
- *
- * NMIs can happen after we take the lock.
- * If we are in an NMI, only take the lock
- * if it is not already taken. Otherwise
- * simply fail.
- */
- if (unlikely(in_nmi())) {
- if (!__raw_spin_trylock(&cpu_buffer->lock))
- goto out_reset;
- } else
- __raw_spin_lock(&cpu_buffer->lock);
+ lock_taken = true;
- lock_taken = true;
+ rb_inc_page(cpu_buffer, &next_page);
- rb_inc_page(cpu_buffer, &next_page);
+ head_page = cpu_buffer->head_page;
+ reader_page = cpu_buffer->reader_page;
- head_page = cpu_buffer->head_page;
- reader_page = cpu_buffer->reader_page;
+ /* we grabbed the lock before incrementing */
+ if (RB_WARN_ON(cpu_buffer, next_page == reader_page))
+ goto out_reset;
- /* we grabbed the lock before incrementing */
- if (RB_WARN_ON(cpu_buffer, next_page == reader_page))
- goto out_reset;
+ /*
+ * If for some reason, we had an interrupt storm that made
+ * it all the way around the buffer, bail, and warn
+ * about it.
+ */
+ if (unlikely(next_page == commit_page)) {
+ cpu_buffer->commit_overrun++;
+ goto out_reset;
+ }
- /*
- * If for some reason, we had an interrupt storm that made
- * it all the way around the buffer, bail, and warn
- * about it.
- */
- if (unlikely(next_page == commit_page)) {
- WARN_ON_ONCE(1);
+ if (next_page == head_page) {
+ if (!(buffer->flags & RB_FL_OVERWRITE))
goto out_reset;
- }
- if (next_page == head_page) {
- if (!(buffer->flags & RB_FL_OVERWRITE))
- goto out_reset;
-
- /* tail_page has not moved yet? */
- if (tail_page == cpu_buffer->tail_page) {
- /* count overflows */
- rb_update_overflow(cpu_buffer);
+ /* tail_page has not moved yet? */
+ if (tail_page == cpu_buffer->tail_page) {
+ /* count overflows */
+ cpu_buffer->overrun +=
+ local_read(&head_page->entries);
- rb_inc_page(cpu_buffer, &head_page);
- cpu_buffer->head_page = head_page;
- cpu_buffer->head_page->read = 0;
- }
+ rb_inc_page(cpu_buffer, &head_page);
+ cpu_buffer->head_page = head_page;
+ cpu_buffer->head_page->read = 0;
}
+ }
- /*
- * If the tail page is still the same as what we think
- * it is, then it is up to us to update the tail
- * pointer.
- */
- if (tail_page == cpu_buffer->tail_page) {
- local_set(&next_page->write, 0);
- local_set(&next_page->page->commit, 0);
- cpu_buffer->tail_page = next_page;
+ /*
+ * If the tail page is still the same as what we think
+ * it is, then it is up to us to update the tail
+ * pointer.
+ */
+ if (tail_page == cpu_buffer->tail_page) {
+ local_set(&next_page->write, 0);
+ local_set(&next_page->entries, 0);
+ local_set(&next_page->page->commit, 0);
+ cpu_buffer->tail_page = next_page;
+
+ /* reread the time stamp */
+ *ts = rb_time_stamp(buffer, cpu_buffer->cpu);
+ cpu_buffer->tail_page->page->time_stamp = *ts;
+ }
- /* reread the time stamp */
- *ts = ring_buffer_time_stamp(buffer, cpu_buffer->cpu);
- cpu_buffer->tail_page->page->time_stamp = *ts;
- }
+ /*
+ * The actual tail page has moved forward.
+ */
+ if (tail < BUF_PAGE_SIZE) {
+ /* Mark the rest of the page with padding */
+ event = __rb_page_index(tail_page, tail);
+ rb_event_set_padding(event);
+ }
- /*
- * The actual tail page has moved forward.
- */
- if (tail < BUF_PAGE_SIZE) {
- /* Mark the rest of the page with padding */
- event = __rb_page_index(tail_page, tail);
- rb_event_set_padding(event);
- }
+ /* Set the write back to the previous setting */
+ local_sub(length, &tail_page->write);
- if (tail <= BUF_PAGE_SIZE)
- /* Set the write back to the previous setting */
- local_set(&tail_page->write, tail);
+ /*
+ * If this was a commit entry that failed,
+ * increment that too
+ */
+ if (tail_page == cpu_buffer->commit_page &&
+ tail == rb_commit_index(cpu_buffer)) {
+ rb_set_commit_to_write(cpu_buffer);
+ }
- /*
- * If this was a commit entry that failed,
- * increment that too
- */
- if (tail_page == cpu_buffer->commit_page &&
- tail == rb_commit_index(cpu_buffer)) {
- rb_set_commit_to_write(cpu_buffer);
- }
+ __raw_spin_unlock(&cpu_buffer->lock);
+ local_irq_restore(flags);
+
+ /* fail and let the caller try again */
+ return ERR_PTR(-EAGAIN);
+
+ out_reset:
+ /* reset write */
+ local_sub(length, &tail_page->write);
+ if (likely(lock_taken))
__raw_spin_unlock(&cpu_buffer->lock);
- local_irq_restore(flags);
+ local_irq_restore(flags);
+ return NULL;
+}
- /* fail and let the caller try again */
- return ERR_PTR(-EAGAIN);
- }
+static struct ring_buffer_event *
+__rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
+ unsigned type, unsigned long length, u64 *ts)
+{
+ struct buffer_page *tail_page, *commit_page;
+ struct ring_buffer_event *event;
+ unsigned long tail, write;
+
+ commit_page = cpu_buffer->commit_page;
+ /* we just need to protect against interrupts */
+ barrier();
+ tail_page = cpu_buffer->tail_page;
+ write = local_add_return(length, &tail_page->write);
+ tail = write - length;
+
+ /* See if we shot pass the end of this buffer page */
+ if (write > BUF_PAGE_SIZE)
+ return rb_move_tail(cpu_buffer, length, tail,
+ commit_page, tail_page, ts);
/* We reserved something on the buffer */
@@ -1289,6 +1329,10 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
event = __rb_page_index(tail_page, tail);
rb_update_event(event, type, length);
+ /* The passed in type is zero for DATA */
+ if (likely(!type))
+ local_inc(&tail_page->entries);
+
/*
* If this is a commit and the tail is zero, then update
* this page's time stamp.
@@ -1297,16 +1341,38 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
cpu_buffer->commit_page->page->time_stamp = *ts;
return event;
+}
- out_reset:
- /* reset write */
- if (tail <= BUF_PAGE_SIZE)
- local_set(&tail_page->write, tail);
+static inline int
+rb_try_to_discard(struct ring_buffer_per_cpu *cpu_buffer,
+ struct ring_buffer_event *event)
+{
+ unsigned long new_index, old_index;
+ struct buffer_page *bpage;
+ unsigned long index;
+ unsigned long addr;
- if (likely(lock_taken))
- __raw_spin_unlock(&cpu_buffer->lock);
- local_irq_restore(flags);
- return NULL;
+ new_index = rb_event_index(event);
+ old_index = new_index + rb_event_length(event);
+ addr = (unsigned long)event;
+ addr &= PAGE_MASK;
+
+ bpage = cpu_buffer->tail_page;
+
+ if (bpage->page == (void *)addr && rb_page_write(bpage) == old_index) {
+ /*
+ * This is on the tail page. It is possible that
+ * a write could come in and move the tail page
+ * and write to the next page. That is fine
+ * because we just shorten what is on this page.
+ */
+ index = local_cmpxchg(&bpage->write, old_index, new_index);
+ if (index == old_index)
+ return 1;
+ }
+
+ /* could not discard */
+ return 0;
}
static int
@@ -1351,16 +1417,23 @@ rb_add_time_stamp(struct ring_buffer_per_cpu *cpu_buffer,
event->array[0] = *delta >> TS_SHIFT;
} else {
cpu_buffer->commit_page->page->time_stamp = *ts;
- event->time_delta = 0;
- event->array[0] = 0;
+ /* try to discard, since we do not need this */
+ if (!rb_try_to_discard(cpu_buffer, event)) {
+ /* nope, just zero it */
+ event->time_delta = 0;
+ event->array[0] = 0;
+ }
}
cpu_buffer->write_stamp = *ts;
/* let the caller know this was the commit */
ret = 1;
} else {
- /* Darn, this is just wasted space */
- event->time_delta = 0;
- event->array[0] = 0;
+ /* Try to discard the event */
+ if (!rb_try_to_discard(cpu_buffer, event)) {
+ /* Darn, this is just wasted space */
+ event->time_delta = 0;
+ event->array[0] = 0;
+ }
ret = 0;
}
@@ -1371,13 +1444,14 @@ rb_add_time_stamp(struct ring_buffer_per_cpu *cpu_buffer,
static struct ring_buffer_event *
rb_reserve_next_event(struct ring_buffer_per_cpu *cpu_buffer,
- unsigned type, unsigned long length)
+ unsigned long length)
{
struct ring_buffer_event *event;
- u64 ts, delta;
+ u64 ts, delta = 0;
int commit = 0;
int nr_loops = 0;
+ length = rb_calculate_event_length(length);
again:
/*
* We allow for interrupts to reenter here and do a trace.
@@ -1391,7 +1465,7 @@ rb_reserve_next_event(struct ring_buffer_per_cpu *cpu_buffer,
if (RB_WARN_ON(cpu_buffer, ++nr_loops > 1000))
return NULL;
- ts = ring_buffer_time_stamp(cpu_buffer->buffer, cpu_buffer->cpu);
+ ts = rb_time_stamp(cpu_buffer->buffer, cpu_buffer->cpu);
/*
* Only the first commit can update the timestamp.
@@ -1401,23 +1475,24 @@ rb_reserve_next_event(struct ring_buffer_per_cpu *cpu_buffer,
* also be made. But only the entry that did the actual
* commit will be something other than zero.
*/
- if (cpu_buffer->tail_page == cpu_buffer->commit_page &&
- rb_page_write(cpu_buffer->tail_page) ==
- rb_commit_index(cpu_buffer)) {
+ if (likely(cpu_buffer->tail_page == cpu_buffer->commit_page &&
+ rb_page_write(cpu_buffer->tail_page) ==
+ rb_commit_index(cpu_buffer))) {
+ u64 diff;
- delta = ts - cpu_buffer->write_stamp;
+ diff = ts - cpu_buffer->write_stamp;
- /* make sure this delta is calculated here */
+ /* make sure this diff is calculated here */
barrier();
/* Did the write stamp get updated already? */
if (unlikely(ts < cpu_buffer->write_stamp))
- delta = 0;
+ goto get_event;
- if (test_time_stamp(delta)) {
+ delta = diff;
+ if (unlikely(test_time_stamp(delta))) {
commit = rb_add_time_stamp(cpu_buffer, &ts, &delta);
-
if (commit == -EBUSY)
return NULL;
@@ -1426,12 +1501,11 @@ rb_reserve_next_event(struct ring_buffer_per_cpu *cpu_buffer,
RB_WARN_ON(cpu_buffer, commit < 0);
}
- } else
- /* Non commits have zero deltas */
- delta = 0;
+ }
- event = __rb_reserve_next(cpu_buffer, type, length, &ts);
- if (PTR_ERR(event) == -EAGAIN)
+ get_event:
+ event = __rb_reserve_next(cpu_buffer, 0, length, &ts);
+ if (unlikely(PTR_ERR(event) == -EAGAIN))
goto again;
if (!event) {
@@ -1448,7 +1522,7 @@ rb_reserve_next_event(struct ring_buffer_per_cpu *cpu_buffer,
* If the timestamp was commited, make the commit our entry
* now so that we will update it when needed.
*/
- if (commit)
+ if (unlikely(commit))
rb_set_commit_event(cpu_buffer, event);
else if (!rb_is_commit(cpu_buffer, event))
delta = 0;
@@ -1458,6 +1532,36 @@ rb_reserve_next_event(struct ring_buffer_per_cpu *cpu_buffer,
return event;
}
+#define TRACE_RECURSIVE_DEPTH 16
+
+static int trace_recursive_lock(void)
+{
+ current->trace_recursion++;
+
+ if (likely(current->trace_recursion < TRACE_RECURSIVE_DEPTH))
+ return 0;
+
+ /* Disable all tracing before we do anything else */
+ tracing_off_permanent();
+
+ printk_once(KERN_WARNING "Tracing recursion: depth[%ld]:"
+ "HC[%lu]:SC[%lu]:NMI[%lu]\n",
+ current->trace_recursion,
+ hardirq_count() >> HARDIRQ_SHIFT,
+ softirq_count() >> SOFTIRQ_SHIFT,
+ in_nmi());
+
+ WARN_ON_ONCE(1);
+ return -1;
+}
+
+static void trace_recursive_unlock(void)
+{
+ WARN_ON_ONCE(!current->trace_recursion);
+
+ current->trace_recursion--;
+}
+
static DEFINE_PER_CPU(int, rb_need_resched);
/**
@@ -1491,6 +1595,9 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer, unsigned long length)
/* If we are tracing schedule, we don't want to recurse */
resched = ftrace_preempt_disable();
+ if (trace_recursive_lock())
+ goto out_nocheck;
+
cpu = raw_smp_processor_id();
if (!cpumask_test_cpu(cpu, buffer->cpumask))
@@ -1501,11 +1608,10 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer, unsigned long length)
if (atomic_read(&cpu_buffer->record_disabled))
goto out;
- length = rb_calculate_event_length(length);
- if (length > BUF_PAGE_SIZE)
+ if (length > BUF_MAX_DATA_SIZE)
goto out;
- event = rb_reserve_next_event(cpu_buffer, RINGBUF_TYPE_DATA, length);
+ event = rb_reserve_next_event(cpu_buffer, length);
if (!event)
goto out;
@@ -1520,6 +1626,9 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer, unsigned long length)
return event;
out:
+ trace_recursive_unlock();
+
+ out_nocheck:
ftrace_preempt_enable(resched);
return NULL;
}
@@ -1528,7 +1637,7 @@ EXPORT_SYMBOL_GPL(ring_buffer_lock_reserve);
static void rb_commit(struct ring_buffer_per_cpu *cpu_buffer,
struct ring_buffer_event *event)
{
- cpu_buffer->entries++;
+ local_inc(&cpu_buffer->entries);
/* Only process further if we own the commit */
if (!rb_is_commit(cpu_buffer, event))
@@ -1558,6 +1667,8 @@ int ring_buffer_unlock_commit(struct ring_buffer *buffer,
rb_commit(cpu_buffer, event);
+ trace_recursive_unlock();
+
/*
* Only the last preempt count needs to restore preemption.
*/
@@ -1570,6 +1681,99 @@ int ring_buffer_unlock_commit(struct ring_buffer *buffer,
}
EXPORT_SYMBOL_GPL(ring_buffer_unlock_commit);
+static inline void rb_event_discard(struct ring_buffer_event *event)
+{
+ /* array[0] holds the actual length for the discarded event */
+ event->array[0] = rb_event_data_length(event) - RB_EVNT_HDR_SIZE;
+ event->type_len = RINGBUF_TYPE_PADDING;
+ /* time delta must be non zero */
+ if (!event->time_delta)
+ event->time_delta = 1;
+}
+
+/**
+ * ring_buffer_event_discard - discard any event in the ring buffer
+ * @event: the event to discard
+ *
+ * Sometimes a event that is in the ring buffer needs to be ignored.
+ * This function lets the user discard an event in the ring buffer
+ * and then that event will not be read later.
+ *
+ * Note, it is up to the user to be careful with this, and protect
+ * against races. If the user discards an event that has been consumed
+ * it is possible that it could corrupt the ring buffer.
+ */
+void ring_buffer_event_discard(struct ring_buffer_event *event)
+{
+ rb_event_discard(event);
+}
+EXPORT_SYMBOL_GPL(ring_buffer_event_discard);
+
+/**
+ * ring_buffer_commit_discard - discard an event that has not been committed
+ * @buffer: the ring buffer
+ * @event: non committed event to discard
+ *
+ * This is similar to ring_buffer_event_discard but must only be
+ * performed on an event that has not been committed yet. The difference
+ * is that this will also try to free the event from the ring buffer
+ * if another event has not been added behind it.
+ *
+ * If another event has been added behind it, it will set the event
+ * up as discarded, and perform the commit.
+ *
+ * If this function is called, do not call ring_buffer_unlock_commit on
+ * the event.
+ */
+void ring_buffer_discard_commit(struct ring_buffer *buffer,
+ struct ring_buffer_event *event)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+ int cpu;
+
+ /* The event is discarded regardless */
+ rb_event_discard(event);
+
+ /*
+ * This must only be called if the event has not been
+ * committed yet. Thus we can assume that preemption
+ * is still disabled.
+ */
+ RB_WARN_ON(buffer, preemptible());
+
+ cpu = smp_processor_id();
+ cpu_buffer = buffer->buffers[cpu];
+
+ if (!rb_try_to_discard(cpu_buffer, event))
+ goto out;
+
+ /*
+ * The commit is still visible by the reader, so we
+ * must increment entries.
+ */
+ local_inc(&cpu_buffer->entries);
+ out:
+ /*
+ * If a write came in and pushed the tail page
+ * we still need to update the commit pointer
+ * if we were the commit.
+ */
+ if (rb_is_commit(cpu_buffer, event))
+ rb_set_commit_to_write(cpu_buffer);
+
+ trace_recursive_unlock();
+
+ /*
+ * Only the last preempt count needs to restore preemption.
+ */
+ if (preempt_count() == 1)
+ ftrace_preempt_enable(per_cpu(rb_need_resched, cpu));
+ else
+ preempt_enable_no_resched_notrace();
+
+}
+EXPORT_SYMBOL_GPL(ring_buffer_discard_commit);
+
/**
* ring_buffer_write - write data to the buffer without reserving
* @buffer: The ring buffer to write to.
@@ -1589,7 +1793,6 @@ int ring_buffer_write(struct ring_buffer *buffer,
{
struct ring_buffer_per_cpu *cpu_buffer;
struct ring_buffer_event *event;
- unsigned long event_length;
void *body;
int ret = -EBUSY;
int cpu, resched;
@@ -1612,9 +1815,10 @@ int ring_buffer_write(struct ring_buffer *buffer,
if (atomic_read(&cpu_buffer->record_disabled))
goto out;
- event_length = rb_calculate_event_length(length);
- event = rb_reserve_next_event(cpu_buffer,
- RINGBUF_TYPE_DATA, event_length);
+ if (length > BUF_MAX_DATA_SIZE)
+ goto out;
+
+ event = rb_reserve_next_event(cpu_buffer, length);
if (!event)
goto out;
@@ -1728,7 +1932,8 @@ unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu)
return 0;
cpu_buffer = buffer->buffers[cpu];
- ret = cpu_buffer->entries;
+ ret = (local_read(&cpu_buffer->entries) - cpu_buffer->overrun)
+ - cpu_buffer->read;
return ret;
}
@@ -1755,6 +1960,47 @@ unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu)
EXPORT_SYMBOL_GPL(ring_buffer_overrun_cpu);
/**
+ * ring_buffer_nmi_dropped_cpu - get the number of nmis that were dropped
+ * @buffer: The ring buffer
+ * @cpu: The per CPU buffer to get the number of overruns from
+ */
+unsigned long ring_buffer_nmi_dropped_cpu(struct ring_buffer *buffer, int cpu)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+ unsigned long ret;
+
+ if (!cpumask_test_cpu(cpu, buffer->cpumask))
+ return 0;
+
+ cpu_buffer = buffer->buffers[cpu];
+ ret = cpu_buffer->nmi_dropped;
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_nmi_dropped_cpu);
+
+/**
+ * ring_buffer_commit_overrun_cpu - get the number of overruns caused by commits
+ * @buffer: The ring buffer
+ * @cpu: The per CPU buffer to get the number of overruns from
+ */
+unsigned long
+ring_buffer_commit_overrun_cpu(struct ring_buffer *buffer, int cpu)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+ unsigned long ret;
+
+ if (!cpumask_test_cpu(cpu, buffer->cpumask))
+ return 0;
+
+ cpu_buffer = buffer->buffers[cpu];
+ ret = cpu_buffer->commit_overrun;
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_commit_overrun_cpu);
+
+/**
* ring_buffer_entries - get the number of entries in a buffer
* @buffer: The ring buffer
*
@@ -1770,7 +2016,8 @@ unsigned long ring_buffer_entries(struct ring_buffer *buffer)
/* if you care about this being correct, lock the buffer */
for_each_buffer_cpu(buffer, cpu) {
cpu_buffer = buffer->buffers[cpu];
- entries += cpu_buffer->entries;
+ entries += (local_read(&cpu_buffer->entries) -
+ cpu_buffer->overrun) - cpu_buffer->read;
}
return entries;
@@ -1862,7 +2109,7 @@ rb_update_read_stamp(struct ring_buffer_per_cpu *cpu_buffer,
{
u64 delta;
- switch (event->type) {
+ switch (event->type_len) {
case RINGBUF_TYPE_PADDING:
return;
@@ -1893,7 +2140,7 @@ rb_update_iter_read_stamp(struct ring_buffer_iter *iter,
{
u64 delta;
- switch (event->type) {
+ switch (event->type_len) {
case RINGBUF_TYPE_PADDING:
return;
@@ -1966,6 +2213,7 @@ rb_get_reader_page(struct ring_buffer_per_cpu *cpu_buffer)
cpu_buffer->reader_page->list.prev = reader->list.prev;
local_set(&cpu_buffer->reader_page->write, 0);
+ local_set(&cpu_buffer->reader_page->entries, 0);
local_set(&cpu_buffer->reader_page->page->commit, 0);
/* Make the reader page now replace the head */
@@ -2008,8 +2256,9 @@ static void rb_advance_reader(struct ring_buffer_per_cpu *cpu_buffer)
event = rb_reader_event(cpu_buffer);
- if (event->type == RINGBUF_TYPE_DATA || rb_discarded_event(event))
- cpu_buffer->entries--;
+ if (event->type_len <= RINGBUF_TYPE_DATA_TYPE_LEN_MAX
+ || rb_discarded_event(event))
+ cpu_buffer->read++;
rb_update_read_stamp(cpu_buffer, event);
@@ -2031,8 +2280,8 @@ static void rb_advance_iter(struct ring_buffer_iter *iter)
* Check if we are at the end of the buffer.
*/
if (iter->head >= rb_page_size(iter->head_page)) {
- if (RB_WARN_ON(buffer,
- iter->head_page == cpu_buffer->commit_page))
+ /* discarded commits can make the page empty */
+ if (iter->head_page == cpu_buffer->commit_page)
return;
rb_inc_iter(iter);
return;
@@ -2075,12 +2324,10 @@ rb_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
/*
* We repeat when a timestamp is encountered. It is possible
* to get multiple timestamps from an interrupt entering just
- * as one timestamp is about to be written. The max times
- * that this can happen is the number of nested interrupts we
- * can have. Nesting 10 deep of interrupts is clearly
- * an anomaly.
+ * as one timestamp is about to be written, or from discarded
+ * commits. The most that we can have is the number on a single page.
*/
- if (RB_WARN_ON(cpu_buffer, ++nr_loops > 10))
+ if (RB_WARN_ON(cpu_buffer, ++nr_loops > RB_TIMESTAMPS_PER_PAGE))
return NULL;
reader = rb_get_reader_page(cpu_buffer);
@@ -2089,7 +2336,7 @@ rb_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
event = rb_reader_event(cpu_buffer);
- switch (event->type) {
+ switch (event->type_len) {
case RINGBUF_TYPE_PADDING:
if (rb_null_event(event))
RB_WARN_ON(cpu_buffer, 1);
@@ -2146,14 +2393,14 @@ rb_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
again:
/*
- * We repeat when a timestamp is encountered. It is possible
- * to get multiple timestamps from an interrupt entering just
- * as one timestamp is about to be written. The max times
- * that this can happen is the number of nested interrupts we
- * can have. Nesting 10 deep of interrupts is clearly
- * an anomaly.
+ * We repeat when a timestamp is encountered.
+ * We can get multiple timestamps by nested interrupts or also
+ * if filtering is on (discarding commits). Since discarding
+ * commits can be frequent we can get a lot of timestamps.
+ * But we limit them by not adding timestamps if they begin
+ * at the start of a page.
*/
- if (RB_WARN_ON(cpu_buffer, ++nr_loops > 10))
+ if (RB_WARN_ON(cpu_buffer, ++nr_loops > RB_TIMESTAMPS_PER_PAGE))
return NULL;
if (rb_per_cpu_empty(cpu_buffer))
@@ -2161,7 +2408,7 @@ rb_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
event = rb_iter_head_event(iter);
- switch (event->type) {
+ switch (event->type_len) {
case RINGBUF_TYPE_PADDING:
if (rb_null_event(event)) {
rb_inc_iter(iter);
@@ -2220,7 +2467,7 @@ ring_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
event = rb_buffer_peek(buffer, cpu, ts);
spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
- if (event && event->type == RINGBUF_TYPE_PADDING) {
+ if (event && event->type_len == RINGBUF_TYPE_PADDING) {
cpu_relax();
goto again;
}
@@ -2248,7 +2495,7 @@ ring_buffer_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
event = rb_iter_peek(iter, ts);
spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
- if (event && event->type == RINGBUF_TYPE_PADDING) {
+ if (event && event->type_len == RINGBUF_TYPE_PADDING) {
cpu_relax();
goto again;
}
@@ -2293,7 +2540,7 @@ ring_buffer_consume(struct ring_buffer *buffer, int cpu, u64 *ts)
out:
preempt_enable();
- if (event && event->type == RINGBUF_TYPE_PADDING) {
+ if (event && event->type_len == RINGBUF_TYPE_PADDING) {
cpu_relax();
goto again;
}
@@ -2386,7 +2633,7 @@ ring_buffer_read(struct ring_buffer_iter *iter, u64 *ts)
out:
spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
- if (event && event->type == RINGBUF_TYPE_PADDING) {
+ if (event && event->type_len == RINGBUF_TYPE_PADDING) {
cpu_relax();
goto again;
}
@@ -2411,6 +2658,7 @@ rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer)
cpu_buffer->head_page
= list_entry(cpu_buffer->pages.next, struct buffer_page, list);
local_set(&cpu_buffer->head_page->write, 0);
+ local_set(&cpu_buffer->head_page->entries, 0);
local_set(&cpu_buffer->head_page->page->commit, 0);
cpu_buffer->head_page->read = 0;
@@ -2420,11 +2668,15 @@ rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer)
INIT_LIST_HEAD(&cpu_buffer->reader_page->list);
local_set(&cpu_buffer->reader_page->write, 0);
+ local_set(&cpu_buffer->reader_page->entries, 0);
local_set(&cpu_buffer->reader_page->page->commit, 0);
cpu_buffer->reader_page->read = 0;
+ cpu_buffer->nmi_dropped = 0;
+ cpu_buffer->commit_overrun = 0;
cpu_buffer->overrun = 0;
- cpu_buffer->entries = 0;
+ cpu_buffer->read = 0;
+ local_set(&cpu_buffer->entries, 0);
cpu_buffer->write_stamp = 0;
cpu_buffer->read_stamp = 0;
@@ -2443,6 +2695,8 @@ void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu)
if (!cpumask_test_cpu(cpu, buffer->cpumask))
return;
+ atomic_inc(&cpu_buffer->record_disabled);
+
spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
__raw_spin_lock(&cpu_buffer->lock);
@@ -2452,6 +2706,8 @@ void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu)
__raw_spin_unlock(&cpu_buffer->lock);
spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
+
+ atomic_dec(&cpu_buffer->record_disabled);
}
EXPORT_SYMBOL_GPL(ring_buffer_reset_cpu);
@@ -2578,28 +2834,6 @@ out:
}
EXPORT_SYMBOL_GPL(ring_buffer_swap_cpu);
-static void rb_remove_entries(struct ring_buffer_per_cpu *cpu_buffer,
- struct buffer_data_page *bpage,
- unsigned int offset)
-{
- struct ring_buffer_event *event;
- unsigned long head;
-
- __raw_spin_lock(&cpu_buffer->lock);
- for (head = offset; head < local_read(&bpage->commit);
- head += rb_event_length(event)) {
-
- event = __rb_data_page_index(bpage, head);
- if (RB_WARN_ON(cpu_buffer, rb_null_event(event)))
- return;
- /* Only count data entries */
- if (event->type != RINGBUF_TYPE_DATA)
- continue;
- cpu_buffer->entries--;
- }
- __raw_spin_unlock(&cpu_buffer->lock);
-}
-
/**
* ring_buffer_alloc_read_page - allocate a page to read from buffer
* @buffer: the buffer to allocate for.
@@ -2630,6 +2864,7 @@ void *ring_buffer_alloc_read_page(struct ring_buffer *buffer)
return bpage;
}
+EXPORT_SYMBOL_GPL(ring_buffer_alloc_read_page);
/**
* ring_buffer_free_read_page - free an allocated read page
@@ -2642,6 +2877,7 @@ void ring_buffer_free_read_page(struct ring_buffer *buffer, void *data)
{
free_page((unsigned long)data);
}
+EXPORT_SYMBOL_GPL(ring_buffer_free_read_page);
/**
* ring_buffer_read_page - extract a page from the ring buffer
@@ -2768,16 +3004,17 @@ int ring_buffer_read_page(struct ring_buffer *buffer,
/* we copied everything to the beginning */
read = 0;
} else {
+ /* update the entry counter */
+ cpu_buffer->read += local_read(&reader->entries);
+
/* swap the pages */
rb_init_page(bpage);
bpage = reader->page;
reader->page = *data_page;
local_set(&reader->write, 0);
+ local_set(&reader->entries, 0);
reader->read = 0;
*data_page = bpage;
-
- /* update the entry counter */
- rb_remove_entries(cpu_buffer, bpage, read);
}
ret = read;
@@ -2787,6 +3024,7 @@ int ring_buffer_read_page(struct ring_buffer *buffer,
out:
return ret;
}
+EXPORT_SYMBOL_GPL(ring_buffer_read_page);
static ssize_t
rb_simple_read(struct file *filp, char __user *ubuf,
@@ -2845,14 +3083,11 @@ static const struct file_operations rb_simple_fops = {
static __init int rb_init_debugfs(void)
{
struct dentry *d_tracer;
- struct dentry *entry;
d_tracer = tracing_init_dentry();
- entry = debugfs_create_file("tracing_on", 0644, d_tracer,
- &ring_buffer_flags, &rb_simple_fops);
- if (!entry)
- pr_warning("Could not create debugfs 'tracing_on' entry\n");
+ trace_create_file("tracing_on", 0644, d_tracer,
+ &ring_buffer_flags, &rb_simple_fops);
return 0;
}
diff --git a/kernel/trace/ring_buffer_benchmark.c b/kernel/trace/ring_buffer_benchmark.c
new file mode 100644
index 0000000..8d68e14
--- /dev/null
+++ b/kernel/trace/ring_buffer_benchmark.c
@@ -0,0 +1,416 @@
+/*
+ * ring buffer tester and benchmark
+ *
+ * Copyright (C) 2009 Steven Rostedt <srostedt@...hat.com>
+ */
+#include <linux/ring_buffer.h>
+#include <linux/completion.h>
+#include <linux/kthread.h>
+#include <linux/module.h>
+#include <linux/time.h>
+
+struct rb_page {
+ u64 ts;
+ local_t commit;
+ char data[4080];
+};
+
+/* run time and sleep time in seconds */
+#define RUN_TIME 10
+#define SLEEP_TIME 10
+
+/* number of events for writer to wake up the reader */
+static int wakeup_interval = 100;
+
+static int reader_finish;
+static struct completion read_start;
+static struct completion read_done;
+
+static struct ring_buffer *buffer;
+static struct task_struct *producer;
+static struct task_struct *consumer;
+static unsigned long read;
+
+static int disable_reader;
+module_param(disable_reader, uint, 0644);
+MODULE_PARM_DESC(disable_reader, "only run producer");
+
+static int read_events;
+
+static int kill_test;
+
+#define KILL_TEST() \
+ do { \
+ if (!kill_test) { \
+ kill_test = 1; \
+ WARN_ON(1); \
+ } \
+ } while (0)
+
+enum event_status {
+ EVENT_FOUND,
+ EVENT_DROPPED,
+};
+
+static enum event_status read_event(int cpu)
+{
+ struct ring_buffer_event *event;
+ int *entry;
+ u64 ts;
+
+ event = ring_buffer_consume(buffer, cpu, &ts);
+ if (!event)
+ return EVENT_DROPPED;
+
+ entry = ring_buffer_event_data(event);
+ if (*entry != cpu) {
+ KILL_TEST();
+ return EVENT_DROPPED;
+ }
+
+ read++;
+ return EVENT_FOUND;
+}
+
+static enum event_status read_page(int cpu)
+{
+ struct ring_buffer_event *event;
+ struct rb_page *rpage;
+ unsigned long commit;
+ void *bpage;
+ int *entry;
+ int ret;
+ int inc;
+ int i;
+
+ bpage = ring_buffer_alloc_read_page(buffer);
+ if (!bpage)
+ return EVENT_DROPPED;
+
+ ret = ring_buffer_read_page(buffer, &bpage, PAGE_SIZE, cpu, 1);
+ if (ret >= 0) {
+ rpage = bpage;
+ commit = local_read(&rpage->commit);
+ for (i = 0; i < commit && !kill_test; i += inc) {
+
+ if (i >= (PAGE_SIZE - offsetof(struct rb_page, data))) {
+ KILL_TEST();
+ break;
+ }
+
+ inc = -1;
+ event = (void *)&rpage->data[i];
+ switch (event->type_len) {
+ case RINGBUF_TYPE_PADDING:
+ /* We don't expect any padding */
+ KILL_TEST();
+ break;
+ case RINGBUF_TYPE_TIME_EXTEND:
+ inc = 8;
+ break;
+ case 0:
+ entry = ring_buffer_event_data(event);
+ if (*entry != cpu) {
+ KILL_TEST();
+ break;
+ }
+ read++;
+ if (!event->array[0]) {
+ KILL_TEST();
+ break;
+ }
+ inc = event->array[0];
+ break;
+ default:
+ entry = ring_buffer_event_data(event);
+ if (*entry != cpu) {
+ KILL_TEST();
+ break;
+ }
+ read++;
+ inc = ((event->type_len + 1) * 4);
+ }
+ if (kill_test)
+ break;
+
+ if (inc <= 0) {
+ KILL_TEST();
+ break;
+ }
+ }
+ }
+ ring_buffer_free_read_page(buffer, bpage);
+
+ if (ret < 0)
+ return EVENT_DROPPED;
+ return EVENT_FOUND;
+}
+
+static void ring_buffer_consumer(void)
+{
+ /* toggle between reading pages and events */
+ read_events ^= 1;
+
+ read = 0;
+ while (!reader_finish && !kill_test) {
+ int found;
+
+ do {
+ int cpu;
+
+ found = 0;
+ for_each_online_cpu(cpu) {
+ enum event_status stat;
+
+ if (read_events)
+ stat = read_event(cpu);
+ else
+ stat = read_page(cpu);
+
+ if (kill_test)
+ break;
+ if (stat == EVENT_FOUND)
+ found = 1;
+ }
+ } while (found && !kill_test);
+
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (reader_finish)
+ break;
+
+ schedule();
+ __set_current_state(TASK_RUNNING);
+ }
+ reader_finish = 0;
+ complete(&read_done);
+}
+
+static void ring_buffer_producer(void)
+{
+ struct timeval start_tv;
+ struct timeval end_tv;
+ unsigned long long time;
+ unsigned long long entries;
+ unsigned long long overruns;
+ unsigned long missed = 0;
+ unsigned long hit = 0;
+ unsigned long avg;
+ int cnt = 0;
+
+ /*
+ * Hammer the buffer for 10 secs (this may
+ * make the system stall)
+ */
+ pr_info("Starting ring buffer hammer\n");
+ do_gettimeofday(&start_tv);
+ do {
+ struct ring_buffer_event *event;
+ int *entry;
+
+ event = ring_buffer_lock_reserve(buffer, 10);
+ if (!event) {
+ missed++;
+ } else {
+ hit++;
+ entry = ring_buffer_event_data(event);
+ *entry = smp_processor_id();
+ ring_buffer_unlock_commit(buffer, event);
+ }
+ do_gettimeofday(&end_tv);
+
+ cnt++;
+ if (consumer && !(cnt % wakeup_interval))
+ wake_up_process(consumer);
+
+#ifndef CONFIG_PREEMPT
+ /*
+ * If we are a non preempt kernel, the 10 second run will
+ * stop everything while it runs. Instead, we will call
+ * cond_resched and also add any time that was lost by a
+ * rescedule.
+ *
+ * Do a cond resched at the same frequency we would wake up
+ * the reader.
+ */
+ if (cnt % wakeup_interval)
+ cond_resched();
+#endif
+
+ } while (end_tv.tv_sec < (start_tv.tv_sec + RUN_TIME) && !kill_test);
+ pr_info("End ring buffer hammer\n");
+
+ if (consumer) {
+ /* Init both completions here to avoid races */
+ init_completion(&read_start);
+ init_completion(&read_done);
+ /* the completions must be visible before the finish var */
+ smp_wmb();
+ reader_finish = 1;
+ /* finish var visible before waking up the consumer */
+ smp_wmb();
+ wake_up_process(consumer);
+ wait_for_completion(&read_done);
+ }
+
+ time = end_tv.tv_sec - start_tv.tv_sec;
+ time *= USEC_PER_SEC;
+ time += (long long)((long)end_tv.tv_usec - (long)start_tv.tv_usec);
+
+ entries = ring_buffer_entries(buffer);
+ overruns = ring_buffer_overruns(buffer);
+
+ if (kill_test)
+ pr_info("ERROR!\n");
+ pr_info("Time: %lld (usecs)\n", time);
+ pr_info("Overruns: %lld\n", overruns);
+ if (disable_reader)
+ pr_info("Read: (reader disabled)\n");
+ else
+ pr_info("Read: %ld (by %s)\n", read,
+ read_events ? "events" : "pages");
+ pr_info("Entries: %lld\n", entries);
+ pr_info("Total: %lld\n", entries + overruns + read);
+ pr_info("Missed: %ld\n", missed);
+ pr_info("Hit: %ld\n", hit);
+
+ /* Convert time from usecs to millisecs */
+ do_div(time, USEC_PER_MSEC);
+ if (time)
+ hit /= (long)time;
+ else
+ pr_info("TIME IS ZERO??\n");
+
+ pr_info("Entries per millisec: %ld\n", hit);
+
+ if (hit) {
+ /* Calculate the average time in nanosecs */
+ avg = NSEC_PER_MSEC / hit;
+ pr_info("%ld ns per entry\n", avg);
+ }
+
+ if (missed) {
+ if (time)
+ missed /= (long)time;
+
+ pr_info("Total iterations per millisec: %ld\n", hit + missed);
+
+ /* it is possible that hit + missed will overflow and be zero */
+ if (!(hit + missed)) {
+ pr_info("hit + missed overflowed and totalled zero!\n");
+ hit--; /* make it non zero */
+ }
+
+ /* Caculate the average time in nanosecs */
+ avg = NSEC_PER_MSEC / (hit + missed);
+ pr_info("%ld ns per entry\n", avg);
+ }
+}
+
+static void wait_to_die(void)
+{
+ set_current_state(TASK_INTERRUPTIBLE);
+ while (!kthread_should_stop()) {
+ schedule();
+ set_current_state(TASK_INTERRUPTIBLE);
+ }
+ __set_current_state(TASK_RUNNING);
+}
+
+static int ring_buffer_consumer_thread(void *arg)
+{
+ while (!kthread_should_stop() && !kill_test) {
+ complete(&read_start);
+
+ ring_buffer_consumer();
+
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (kthread_should_stop() || kill_test)
+ break;
+
+ schedule();
+ __set_current_state(TASK_RUNNING);
+ }
+ __set_current_state(TASK_RUNNING);
+
+ if (kill_test)
+ wait_to_die();
+
+ return 0;
+}
+
+static int ring_buffer_producer_thread(void *arg)
+{
+ init_completion(&read_start);
+
+ while (!kthread_should_stop() && !kill_test) {
+ ring_buffer_reset(buffer);
+
+ if (consumer) {
+ smp_wmb();
+ wake_up_process(consumer);
+ wait_for_completion(&read_start);
+ }
+
+ ring_buffer_producer();
+
+ pr_info("Sleeping for 10 secs\n");
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(HZ * SLEEP_TIME);
+ __set_current_state(TASK_RUNNING);
+ }
+
+ if (kill_test)
+ wait_to_die();
+
+ return 0;
+}
+
+static int __init ring_buffer_benchmark_init(void)
+{
+ int ret;
+
+ /* make a one meg buffer in overwite mode */
+ buffer = ring_buffer_alloc(1000000, RB_FL_OVERWRITE);
+ if (!buffer)
+ return -ENOMEM;
+
+ if (!disable_reader) {
+ consumer = kthread_create(ring_buffer_consumer_thread,
+ NULL, "rb_consumer");
+ ret = PTR_ERR(consumer);
+ if (IS_ERR(consumer))
+ goto out_fail;
+ }
+
+ producer = kthread_run(ring_buffer_producer_thread,
+ NULL, "rb_producer");
+ ret = PTR_ERR(producer);
+
+ if (IS_ERR(producer))
+ goto out_kill;
+
+ return 0;
+
+ out_kill:
+ if (consumer)
+ kthread_stop(consumer);
+
+ out_fail:
+ ring_buffer_free(buffer);
+ return ret;
+}
+
+static void __exit ring_buffer_benchmark_exit(void)
+{
+ kthread_stop(producer);
+ if (consumer)
+ kthread_stop(consumer);
+ ring_buffer_free(buffer);
+}
+
+module_init(ring_buffer_benchmark_init);
+module_exit(ring_buffer_benchmark_exit);
+
+MODULE_AUTHOR("Steven Rostedt");
+MODULE_DESCRIPTION("ring_buffer_benchmark");
+MODULE_LICENSE("GPL");
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index a884c09..cae34c6 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -171,6 +171,13 @@ static struct trace_array global_trace;
static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu);
+int filter_current_check_discard(struct ftrace_event_call *call, void *rec,
+ struct ring_buffer_event *event)
+{
+ return filter_check_discard(call, rec, global_trace.buffer, event);
+}
+EXPORT_SYMBOL_GPL(filter_current_check_discard);
+
cycle_t ftrace_now(int cpu)
{
u64 ts;
@@ -255,7 +262,8 @@ static DECLARE_WAIT_QUEUE_HEAD(trace_wait);
/* trace_flags holds trace_options default values */
unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |
- TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | TRACE_ITER_SLEEP_TIME;
+ TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | TRACE_ITER_SLEEP_TIME |
+ TRACE_ITER_GRAPH_TIME;
/**
* trace_wake_up - wake up tasks waiting for trace input
@@ -317,6 +325,7 @@ static const char *trace_options[] = {
"latency-format",
"global-clock",
"sleep-time",
+ "graph-time",
NULL
};
@@ -402,17 +411,6 @@ static ssize_t trace_seq_to_buffer(struct trace_seq *s, void *buf, size_t cnt)
return cnt;
}
-static void
-trace_print_seq(struct seq_file *m, struct trace_seq *s)
-{
- int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
-
- s->buffer[len] = 0;
- seq_puts(m, s->buffer);
-
- trace_seq_init(s);
-}
-
/**
* update_max_tr - snapshot all trace buffers from global_trace to max_tr
* @tr: tracer
@@ -641,6 +639,16 @@ void tracing_reset_online_cpus(struct trace_array *tr)
tracing_reset(tr, cpu);
}
+void tracing_reset_current(int cpu)
+{
+ tracing_reset(&global_trace, cpu);
+}
+
+void tracing_reset_current_online_cpus(void)
+{
+ tracing_reset_online_cpus(&global_trace);
+}
+
#define SAVED_CMDLINES 128
#define NO_CMDLINE_MAP UINT_MAX
static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1];
@@ -800,6 +808,7 @@ void trace_find_cmdline(int pid, char comm[])
return;
}
+ preempt_disable();
__raw_spin_lock(&trace_cmdline_lock);
map = map_pid_to_cmdline[pid];
if (map != NO_CMDLINE_MAP)
@@ -808,6 +817,7 @@ void trace_find_cmdline(int pid, char comm[])
strcpy(comm, "<...>");
__raw_spin_unlock(&trace_cmdline_lock);
+ preempt_enable();
}
void tracing_record_cmdline(struct task_struct *tsk)
@@ -840,7 +850,7 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags,
}
struct ring_buffer_event *trace_buffer_lock_reserve(struct trace_array *tr,
- unsigned char type,
+ int type,
unsigned long len,
unsigned long flags, int pc)
{
@@ -883,30 +893,40 @@ void trace_buffer_unlock_commit(struct trace_array *tr,
}
struct ring_buffer_event *
-trace_current_buffer_lock_reserve(unsigned char type, unsigned long len,
+trace_current_buffer_lock_reserve(int type, unsigned long len,
unsigned long flags, int pc)
{
return trace_buffer_lock_reserve(&global_trace,
type, len, flags, pc);
}
+EXPORT_SYMBOL_GPL(trace_current_buffer_lock_reserve);
void trace_current_buffer_unlock_commit(struct ring_buffer_event *event,
unsigned long flags, int pc)
{
- return __trace_buffer_unlock_commit(&global_trace, event, flags, pc, 1);
+ __trace_buffer_unlock_commit(&global_trace, event, flags, pc, 1);
}
+EXPORT_SYMBOL_GPL(trace_current_buffer_unlock_commit);
void trace_nowake_buffer_unlock_commit(struct ring_buffer_event *event,
unsigned long flags, int pc)
{
- return __trace_buffer_unlock_commit(&global_trace, event, flags, pc, 0);
+ __trace_buffer_unlock_commit(&global_trace, event, flags, pc, 0);
+}
+EXPORT_SYMBOL_GPL(trace_nowake_buffer_unlock_commit);
+
+void trace_current_buffer_discard_commit(struct ring_buffer_event *event)
+{
+ ring_buffer_discard_commit(global_trace.buffer, event);
}
+EXPORT_SYMBOL_GPL(trace_current_buffer_discard_commit);
void
trace_function(struct trace_array *tr,
unsigned long ip, unsigned long parent_ip, unsigned long flags,
int pc)
{
+ struct ftrace_event_call *call = &event_function;
struct ring_buffer_event *event;
struct ftrace_entry *entry;
@@ -921,7 +941,9 @@ trace_function(struct trace_array *tr,
entry = ring_buffer_event_data(event);
entry->ip = ip;
entry->parent_ip = parent_ip;
- ring_buffer_unlock_commit(tr->buffer, event);
+
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ ring_buffer_unlock_commit(tr->buffer, event);
}
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
@@ -930,6 +952,7 @@ static int __trace_graph_entry(struct trace_array *tr,
unsigned long flags,
int pc)
{
+ struct ftrace_event_call *call = &event_funcgraph_entry;
struct ring_buffer_event *event;
struct ftrace_graph_ent_entry *entry;
@@ -942,7 +965,8 @@ static int __trace_graph_entry(struct trace_array *tr,
return 0;
entry = ring_buffer_event_data(event);
entry->graph_ent = *trace;
- ring_buffer_unlock_commit(global_trace.buffer, event);
+ if (!filter_current_check_discard(call, entry, event))
+ ring_buffer_unlock_commit(global_trace.buffer, event);
return 1;
}
@@ -952,6 +976,7 @@ static void __trace_graph_return(struct trace_array *tr,
unsigned long flags,
int pc)
{
+ struct ftrace_event_call *call = &event_funcgraph_exit;
struct ring_buffer_event *event;
struct ftrace_graph_ret_entry *entry;
@@ -964,7 +989,8 @@ static void __trace_graph_return(struct trace_array *tr,
return;
entry = ring_buffer_event_data(event);
entry->ret = *trace;
- ring_buffer_unlock_commit(global_trace.buffer, event);
+ if (!filter_current_check_discard(call, entry, event))
+ ring_buffer_unlock_commit(global_trace.buffer, event);
}
#endif
@@ -982,6 +1008,7 @@ static void __ftrace_trace_stack(struct trace_array *tr,
int skip, int pc)
{
#ifdef CONFIG_STACKTRACE
+ struct ftrace_event_call *call = &event_kernel_stack;
struct ring_buffer_event *event;
struct stack_entry *entry;
struct stack_trace trace;
@@ -999,7 +1026,8 @@ static void __ftrace_trace_stack(struct trace_array *tr,
trace.entries = entry->caller;
save_stack_trace(&trace);
- ring_buffer_unlock_commit(tr->buffer, event);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ ring_buffer_unlock_commit(tr->buffer, event);
#endif
}
@@ -1024,6 +1052,7 @@ static void ftrace_trace_userstack(struct trace_array *tr,
unsigned long flags, int pc)
{
#ifdef CONFIG_STACKTRACE
+ struct ftrace_event_call *call = &event_user_stack;
struct ring_buffer_event *event;
struct userstack_entry *entry;
struct stack_trace trace;
@@ -1045,7 +1074,8 @@ static void ftrace_trace_userstack(struct trace_array *tr,
trace.entries = entry->caller;
save_stack_trace_user(&trace);
- ring_buffer_unlock_commit(tr->buffer, event);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ ring_buffer_unlock_commit(tr->buffer, event);
#endif
}
@@ -1089,6 +1119,7 @@ tracing_sched_switch_trace(struct trace_array *tr,
struct task_struct *next,
unsigned long flags, int pc)
{
+ struct ftrace_event_call *call = &event_context_switch;
struct ring_buffer_event *event;
struct ctx_switch_entry *entry;
@@ -1104,7 +1135,9 @@ tracing_sched_switch_trace(struct trace_array *tr,
entry->next_prio = next->prio;
entry->next_state = next->state;
entry->next_cpu = task_cpu(next);
- trace_buffer_unlock_commit(tr, event, flags, pc);
+
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ trace_buffer_unlock_commit(tr, event, flags, pc);
}
void
@@ -1113,6 +1146,7 @@ tracing_sched_wakeup_trace(struct trace_array *tr,
struct task_struct *curr,
unsigned long flags, int pc)
{
+ struct ftrace_event_call *call = &event_wakeup;
struct ring_buffer_event *event;
struct ctx_switch_entry *entry;
@@ -1129,7 +1163,8 @@ tracing_sched_wakeup_trace(struct trace_array *tr,
entry->next_state = wakee->state;
entry->next_cpu = task_cpu(wakee);
- ring_buffer_unlock_commit(tr->buffer, event);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ ring_buffer_unlock_commit(tr->buffer, event);
ftrace_trace_stack(tr, flags, 6, pc);
ftrace_trace_userstack(tr, flags, pc);
}
@@ -1230,11 +1265,13 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
(raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
static u32 trace_buf[TRACE_BUF_SIZE];
+ struct ftrace_event_call *call = &event_bprint;
struct ring_buffer_event *event;
struct trace_array *tr = &global_trace;
struct trace_array_cpu *data;
struct bprint_entry *entry;
unsigned long flags;
+ int disable;
int resched;
int cpu, len = 0, size, pc;
@@ -1249,7 +1286,8 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
cpu = raw_smp_processor_id();
data = tr->data[cpu];
- if (unlikely(atomic_read(&data->disabled)))
+ disable = atomic_inc_return(&data->disabled);
+ if (unlikely(disable != 1))
goto out;
/* Lockdep uses trace_printk for lock tracing */
@@ -1269,13 +1307,15 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
entry->fmt = fmt;
memcpy(entry->buf, trace_buf, sizeof(u32) * len);
- ring_buffer_unlock_commit(tr->buffer, event);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ ring_buffer_unlock_commit(tr->buffer, event);
out_unlock:
__raw_spin_unlock(&trace_buf_lock);
local_irq_restore(flags);
out:
+ atomic_dec_return(&data->disabled);
ftrace_preempt_enable(resched);
unpause_graph_tracing();
@@ -1288,12 +1328,14 @@ int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
static raw_spinlock_t trace_buf_lock = __RAW_SPIN_LOCK_UNLOCKED;
static char trace_buf[TRACE_BUF_SIZE];
+ struct ftrace_event_call *call = &event_print;
struct ring_buffer_event *event;
struct trace_array *tr = &global_trace;
struct trace_array_cpu *data;
int cpu, len = 0, size, pc;
struct print_entry *entry;
unsigned long irq_flags;
+ int disable;
if (tracing_disabled || tracing_selftest_running)
return 0;
@@ -1303,7 +1345,8 @@ int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
cpu = raw_smp_processor_id();
data = tr->data[cpu];
- if (unlikely(atomic_read(&data->disabled)))
+ disable = atomic_inc_return(&data->disabled);
+ if (unlikely(disable != 1))
goto out;
pause_graph_tracing();
@@ -1323,13 +1366,15 @@ int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
memcpy(&entry->buf, trace_buf, len);
entry->buf[len] = 0;
- ring_buffer_unlock_commit(tr->buffer, event);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ ring_buffer_unlock_commit(tr->buffer, event);
out_unlock:
__raw_spin_unlock(&trace_buf_lock);
raw_local_irq_restore(irq_flags);
unpause_graph_tracing();
out:
+ atomic_dec_return(&data->disabled);
preempt_enable_notrace();
return len;
@@ -1526,12 +1571,14 @@ static void *s_start(struct seq_file *m, loff_t *pos)
p = s_next(m, p, &l);
}
+ trace_event_read_lock();
return p;
}
static void s_stop(struct seq_file *m, void *p)
{
atomic_dec(&trace_record_cmdline_disabled);
+ trace_event_read_unlock();
}
static void print_lat_help_header(struct seq_file *m)
@@ -1774,6 +1821,7 @@ static int trace_empty(struct trace_iterator *iter)
return 1;
}
+/* Called with trace_event_read_lock() held. */
static enum print_line_t print_trace_line(struct trace_iterator *iter)
{
enum print_line_t ret;
@@ -2397,6 +2445,56 @@ static const struct file_operations tracing_readme_fops = {
};
static ssize_t
+tracing_saved_cmdlines_read(struct file *file, char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ char *buf_comm;
+ char *file_buf;
+ char *buf;
+ int len = 0;
+ int pid;
+ int i;
+
+ file_buf = kmalloc(SAVED_CMDLINES*(16+TASK_COMM_LEN), GFP_KERNEL);
+ if (!file_buf)
+ return -ENOMEM;
+
+ buf_comm = kmalloc(TASK_COMM_LEN, GFP_KERNEL);
+ if (!buf_comm) {
+ kfree(file_buf);
+ return -ENOMEM;
+ }
+
+ buf = file_buf;
+
+ for (i = 0; i < SAVED_CMDLINES; i++) {
+ int r;
+
+ pid = map_cmdline_to_pid[i];
+ if (pid == -1 || pid == NO_CMDLINE_MAP)
+ continue;
+
+ trace_find_cmdline(pid, buf_comm);
+ r = sprintf(buf, "%d %s\n", pid, buf_comm);
+ buf += r;
+ len += r;
+ }
+
+ len = simple_read_from_buffer(ubuf, cnt, ppos,
+ file_buf, len);
+
+ kfree(file_buf);
+ kfree(buf_comm);
+
+ return len;
+}
+
+static const struct file_operations tracing_saved_cmdlines_fops = {
+ .open = tracing_open_generic,
+ .read = tracing_saved_cmdlines_read,
+};
+
+static ssize_t
tracing_ctrl_read(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
@@ -2728,6 +2826,9 @@ static int tracing_open_pipe(struct inode *inode, struct file *filp)
/* trace pipe does not show start of buffer */
cpumask_setall(iter->started);
+ if (trace_flags & TRACE_ITER_LATENCY_FMT)
+ iter->iter_flags |= TRACE_FILE_LAT_FMT;
+
iter->cpu_file = cpu_file;
iter->tr = &global_trace;
mutex_init(&iter->mutex);
@@ -2915,6 +3016,7 @@ waitagain:
offsetof(struct trace_iterator, seq));
iter->pos = -1;
+ trace_event_read_lock();
while (find_next_entry_inc(iter) != NULL) {
enum print_line_t ret;
int len = iter->seq.len;
@@ -2931,6 +3033,7 @@ waitagain:
if (iter->seq.len >= cnt)
break;
}
+ trace_event_read_unlock();
/* Now copy what we have to the user */
sret = trace_seq_to_user(&iter->seq, ubuf, cnt);
@@ -3053,6 +3156,8 @@ static ssize_t tracing_splice_read_pipe(struct file *filp,
goto out_err;
}
+ trace_event_read_lock();
+
/* Fill as many pages as possible. */
for (i = 0, rem = len; i < PIPE_BUFFERS && rem; i++) {
pages[i] = alloc_page(GFP_KERNEL);
@@ -3075,6 +3180,7 @@ static ssize_t tracing_splice_read_pipe(struct file *filp,
trace_seq_init(&iter->seq);
}
+ trace_event_read_unlock();
mutex_unlock(&iter->mutex);
spd.nr_pages = i;
@@ -3425,7 +3531,7 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
.spd_release = buffer_spd_release,
};
struct buffer_ref *ref;
- int size, i;
+ int entries, size, i;
size_t ret;
if (*ppos & (PAGE_SIZE - 1)) {
@@ -3440,7 +3546,9 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
len &= PAGE_MASK;
}
- for (i = 0; i < PIPE_BUFFERS && len; i++, len -= PAGE_SIZE) {
+ entries = ring_buffer_entries_cpu(info->tr->buffer, info->cpu);
+
+ for (i = 0; i < PIPE_BUFFERS && len && entries; i++, len -= PAGE_SIZE) {
struct page *page;
int r;
@@ -3457,7 +3565,7 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
}
r = ring_buffer_read_page(ref->buffer, &ref->page,
- len, info->cpu, 0);
+ len, info->cpu, 1);
if (r < 0) {
ring_buffer_free_read_page(ref->buffer,
ref->page);
@@ -3481,6 +3589,8 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
spd.partial[i].private = (unsigned long)ref;
spd.nr_pages++;
*ppos += PAGE_SIZE;
+
+ entries = ring_buffer_entries_cpu(info->tr->buffer, info->cpu);
}
spd.nr_pages = i;
@@ -3508,6 +3618,45 @@ static const struct file_operations tracing_buffers_fops = {
.llseek = no_llseek,
};
+static ssize_t
+tracing_stats_read(struct file *filp, char __user *ubuf,
+ size_t count, loff_t *ppos)
+{
+ unsigned long cpu = (unsigned long)filp->private_data;
+ struct trace_array *tr = &global_trace;
+ struct trace_seq *s;
+ unsigned long cnt;
+
+ s = kmalloc(sizeof(*s), GFP_ATOMIC);
+ if (!s)
+ return ENOMEM;
+
+ trace_seq_init(s);
+
+ cnt = ring_buffer_entries_cpu(tr->buffer, cpu);
+ trace_seq_printf(s, "entries: %ld\n", cnt);
+
+ cnt = ring_buffer_overrun_cpu(tr->buffer, cpu);
+ trace_seq_printf(s, "overrun: %ld\n", cnt);
+
+ cnt = ring_buffer_commit_overrun_cpu(tr->buffer, cpu);
+ trace_seq_printf(s, "commit overrun: %ld\n", cnt);
+
+ cnt = ring_buffer_nmi_dropped_cpu(tr->buffer, cpu);
+ trace_seq_printf(s, "nmi dropped: %ld\n", cnt);
+
+ count = simple_read_from_buffer(ubuf, count, ppos, s->buffer, s->len);
+
+ kfree(s);
+
+ return count;
+}
+
+static const struct file_operations tracing_stats_fops = {
+ .open = tracing_open_generic,
+ .read = tracing_stats_read,
+};
+
#ifdef CONFIG_DYNAMIC_FTRACE
int __weak ftrace_arch_read_dyn_info(char *buf, int size)
@@ -3597,7 +3746,7 @@ struct dentry *tracing_dentry_percpu(void)
static void tracing_init_debugfs_percpu(long cpu)
{
struct dentry *d_percpu = tracing_dentry_percpu();
- struct dentry *entry, *d_cpu;
+ struct dentry *d_cpu;
/* strlen(cpu) + MAX(log10(cpu)) + '\0' */
char cpu_dir[7];
@@ -3612,21 +3761,18 @@ static void tracing_init_debugfs_percpu(long cpu)
}
/* per cpu trace_pipe */
- entry = debugfs_create_file("trace_pipe", 0444, d_cpu,
- (void *) cpu, &tracing_pipe_fops);
- if (!entry)
- pr_warning("Could not create debugfs 'trace_pipe' entry\n");
+ trace_create_file("trace_pipe", 0444, d_cpu,
+ (void *) cpu, &tracing_pipe_fops);
/* per cpu trace */
- entry = debugfs_create_file("trace", 0644, d_cpu,
- (void *) cpu, &tracing_fops);
- if (!entry)
- pr_warning("Could not create debugfs 'trace' entry\n");
+ trace_create_file("trace", 0644, d_cpu,
+ (void *) cpu, &tracing_fops);
+
+ trace_create_file("trace_pipe_raw", 0444, d_cpu,
+ (void *) cpu, &tracing_buffers_fops);
- entry = debugfs_create_file("trace_pipe_raw", 0444, d_cpu,
- (void *) cpu, &tracing_buffers_fops);
- if (!entry)
- pr_warning("Could not create debugfs 'trace_pipe_raw' entry\n");
+ trace_create_file("stats", 0444, d_cpu,
+ (void *) cpu, &tracing_stats_fops);
}
#ifdef CONFIG_FTRACE_SELFTEST
@@ -3782,6 +3928,22 @@ static const struct file_operations trace_options_core_fops = {
.write = trace_options_core_write,
};
+struct dentry *trace_create_file(const char *name,
+ mode_t mode,
+ struct dentry *parent,
+ void *data,
+ const struct file_operations *fops)
+{
+ struct dentry *ret;
+
+ ret = debugfs_create_file(name, mode, parent, data, fops);
+ if (!ret)
+ pr_warning("Could not create debugfs '%s' entry\n", name);
+
+ return ret;
+}
+
+
static struct dentry *trace_options_init_dentry(void)
{
struct dentry *d_tracer;
@@ -3809,7 +3971,6 @@ create_trace_option_file(struct trace_option_dentry *topt,
struct tracer_opt *opt)
{
struct dentry *t_options;
- struct dentry *entry;
t_options = trace_options_init_dentry();
if (!t_options)
@@ -3818,11 +3979,9 @@ create_trace_option_file(struct trace_option_dentry *topt,
topt->flags = flags;
topt->opt = opt;
- entry = debugfs_create_file(opt->name, 0644, t_options, topt,
+ topt->entry = trace_create_file(opt->name, 0644, t_options, topt,
&trace_options_fops);
- topt->entry = entry;
-
}
static struct trace_option_dentry *
@@ -3877,123 +4036,84 @@ static struct dentry *
create_trace_option_core_file(const char *option, long index)
{
struct dentry *t_options;
- struct dentry *entry;
t_options = trace_options_init_dentry();
if (!t_options)
return NULL;
- entry = debugfs_create_file(option, 0644, t_options, (void *)index,
+ return trace_create_file(option, 0644, t_options, (void *)index,
&trace_options_core_fops);
-
- return entry;
}
static __init void create_trace_options_dir(void)
{
struct dentry *t_options;
- struct dentry *entry;
int i;
t_options = trace_options_init_dentry();
if (!t_options)
return;
- for (i = 0; trace_options[i]; i++) {
- entry = create_trace_option_core_file(trace_options[i], i);
- if (!entry)
- pr_warning("Could not create debugfs %s entry\n",
- trace_options[i]);
- }
+ for (i = 0; trace_options[i]; i++)
+ create_trace_option_core_file(trace_options[i], i);
}
static __init int tracer_init_debugfs(void)
{
struct dentry *d_tracer;
- struct dentry *entry;
int cpu;
d_tracer = tracing_init_dentry();
- entry = debugfs_create_file("tracing_enabled", 0644, d_tracer,
- &global_trace, &tracing_ctrl_fops);
- if (!entry)
- pr_warning("Could not create debugfs 'tracing_enabled' entry\n");
+ trace_create_file("tracing_enabled", 0644, d_tracer,
+ &global_trace, &tracing_ctrl_fops);
- entry = debugfs_create_file("trace_options", 0644, d_tracer,
- NULL, &tracing_iter_fops);
- if (!entry)
- pr_warning("Could not create debugfs 'trace_options' entry\n");
+ trace_create_file("trace_options", 0644, d_tracer,
+ NULL, &tracing_iter_fops);
- create_trace_options_dir();
+ trace_create_file("tracing_cpumask", 0644, d_tracer,
+ NULL, &tracing_cpumask_fops);
+
+ trace_create_file("trace", 0644, d_tracer,
+ (void *) TRACE_PIPE_ALL_CPU, &tracing_fops);
- entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer,
- NULL, &tracing_cpumask_fops);
- if (!entry)
- pr_warning("Could not create debugfs 'tracing_cpumask' entry\n");
-
- entry = debugfs_create_file("trace", 0644, d_tracer,
- (void *) TRACE_PIPE_ALL_CPU, &tracing_fops);
- if (!entry)
- pr_warning("Could not create debugfs 'trace' entry\n");
-
- entry = debugfs_create_file("available_tracers", 0444, d_tracer,
- &global_trace, &show_traces_fops);
- if (!entry)
- pr_warning("Could not create debugfs 'available_tracers' entry\n");
-
- entry = debugfs_create_file("current_tracer", 0444, d_tracer,
- &global_trace, &set_tracer_fops);
- if (!entry)
- pr_warning("Could not create debugfs 'current_tracer' entry\n");
-
- entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer,
- &tracing_max_latency,
- &tracing_max_lat_fops);
- if (!entry)
- pr_warning("Could not create debugfs "
- "'tracing_max_latency' entry\n");
-
- entry = debugfs_create_file("tracing_thresh", 0644, d_tracer,
- &tracing_thresh, &tracing_max_lat_fops);
- if (!entry)
- pr_warning("Could not create debugfs "
- "'tracing_thresh' entry\n");
- entry = debugfs_create_file("README", 0644, d_tracer,
- NULL, &tracing_readme_fops);
- if (!entry)
- pr_warning("Could not create debugfs 'README' entry\n");
-
- entry = debugfs_create_file("trace_pipe", 0444, d_tracer,
+ trace_create_file("available_tracers", 0444, d_tracer,
+ &global_trace, &show_traces_fops);
+
+ trace_create_file("current_tracer", 0644, d_tracer,
+ &global_trace, &set_tracer_fops);
+
+ trace_create_file("tracing_max_latency", 0644, d_tracer,
+ &tracing_max_latency, &tracing_max_lat_fops);
+
+ trace_create_file("tracing_thresh", 0644, d_tracer,
+ &tracing_thresh, &tracing_max_lat_fops);
+
+ trace_create_file("README", 0444, d_tracer,
+ NULL, &tracing_readme_fops);
+
+ trace_create_file("trace_pipe", 0444, d_tracer,
(void *) TRACE_PIPE_ALL_CPU, &tracing_pipe_fops);
- if (!entry)
- pr_warning("Could not create debugfs "
- "'trace_pipe' entry\n");
-
- entry = debugfs_create_file("buffer_size_kb", 0644, d_tracer,
- &global_trace, &tracing_entries_fops);
- if (!entry)
- pr_warning("Could not create debugfs "
- "'buffer_size_kb' entry\n");
-
- entry = debugfs_create_file("trace_marker", 0220, d_tracer,
- NULL, &tracing_mark_fops);
- if (!entry)
- pr_warning("Could not create debugfs "
- "'trace_marker' entry\n");
+
+ trace_create_file("buffer_size_kb", 0644, d_tracer,
+ &global_trace, &tracing_entries_fops);
+
+ trace_create_file("trace_marker", 0220, d_tracer,
+ NULL, &tracing_mark_fops);
+
+ trace_create_file("saved_cmdlines", 0444, d_tracer,
+ NULL, &tracing_saved_cmdlines_fops);
#ifdef CONFIG_DYNAMIC_FTRACE
- entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer,
- &ftrace_update_tot_cnt,
- &tracing_dyn_info_fops);
- if (!entry)
- pr_warning("Could not create debugfs "
- "'dyn_ftrace_total_info' entry\n");
+ trace_create_file("dyn_ftrace_total_info", 0444, d_tracer,
+ &ftrace_update_tot_cnt, &tracing_dyn_info_fops);
#endif
#ifdef CONFIG_SYSPROF_TRACER
init_tracer_sysprof_debugfs(d_tracer);
#endif
+ create_trace_options_dir();
+
for_each_tracing_cpu(cpu)
tracing_init_debugfs_percpu(cpu);
@@ -4064,7 +4184,8 @@ trace_printk_seq(struct trace_seq *s)
static void __ftrace_dump(bool disable_tracing)
{
- static DEFINE_SPINLOCK(ftrace_dump_lock);
+ static raw_spinlock_t ftrace_dump_lock =
+ (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
/* use static because iter can be a bit big for the stack */
static struct trace_iterator iter;
unsigned int old_userobj;
@@ -4073,7 +4194,8 @@ static void __ftrace_dump(bool disable_tracing)
int cnt = 0, cpu;
/* only one dump */
- spin_lock_irqsave(&ftrace_dump_lock, flags);
+ local_irq_save(flags);
+ __raw_spin_lock(&ftrace_dump_lock);
if (dump_ran)
goto out;
@@ -4145,7 +4267,8 @@ static void __ftrace_dump(bool disable_tracing)
}
out:
- spin_unlock_irqrestore(&ftrace_dump_lock, flags);
+ __raw_spin_unlock(&ftrace_dump_lock);
+ local_irq_restore(flags);
}
/* By default: disable tracing after the dump */
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index e685ac2..6e735d4 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -9,9 +9,12 @@
#include <linux/mmiotrace.h>
#include <linux/ftrace.h>
#include <trace/boot.h>
-#include <trace/kmemtrace.h>
+#include <linux/kmemtrace.h>
#include <trace/power.h>
+#include <linux/trace_seq.h>
+#include <linux/ftrace_event.h>
+
enum trace_type {
__TRACE_FIRST_TYPE = 0,
@@ -42,20 +45,6 @@ enum trace_type {
};
/*
- * The trace entry - the most basic unit of tracing. This is what
- * is printed in the end as a single line in the trace output, such as:
- *
- * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
- */
-struct trace_entry {
- unsigned char type;
- unsigned char flags;
- unsigned char preempt_count;
- int pid;
- int tgid;
-};
-
-/*
* Function trace entry - function address and parent function addres:
*/
struct ftrace_entry {
@@ -263,8 +252,6 @@ struct trace_array_cpu {
char comm[TASK_COMM_LEN];
};
-struct trace_iterator;
-
/*
* The trace array - an array of per-CPU trace arrays. This is the
* highest level data structure that individual tracers deal with.
@@ -339,15 +326,6 @@ extern void __ftrace_bad_type(void);
__ftrace_bad_type(); \
} while (0)
-/* Return values for print_line callback */
-enum print_line_t {
- TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
- TRACE_TYPE_HANDLED = 1,
- TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */
- TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */
-};
-
-
/*
* An option specific to a tracer. This is a boolean value.
* The bit is the bit index that sets its value on the
@@ -423,60 +401,30 @@ struct tracer {
struct tracer_stat *stats;
};
-struct trace_seq {
- unsigned char buffer[PAGE_SIZE];
- unsigned int len;
- unsigned int readpos;
-};
-
-static inline void
-trace_seq_init(struct trace_seq *s)
-{
- s->len = 0;
- s->readpos = 0;
-}
-
#define TRACE_PIPE_ALL_CPU -1
-/*
- * Trace iterator - used by printout routines who present trace
- * results to users and which routines might sleep, etc:
- */
-struct trace_iterator {
- struct trace_array *tr;
- struct tracer *trace;
- void *private;
- int cpu_file;
- struct mutex mutex;
- struct ring_buffer_iter *buffer_iter[NR_CPUS];
-
- /* The below is zeroed out in pipe_read */
- struct trace_seq seq;
- struct trace_entry *ent;
- int cpu;
- u64 ts;
-
- unsigned long iter_flags;
- loff_t pos;
- long idx;
-
- cpumask_var_t started;
-};
-
int tracer_init(struct tracer *t, struct trace_array *tr);
int tracing_is_enabled(void);
void trace_wake_up(void);
void tracing_reset(struct trace_array *tr, int cpu);
void tracing_reset_online_cpus(struct trace_array *tr);
+void tracing_reset_current(int cpu);
+void tracing_reset_current_online_cpus(void);
int tracing_open_generic(struct inode *inode, struct file *filp);
+struct dentry *trace_create_file(const char *name,
+ mode_t mode,
+ struct dentry *parent,
+ void *data,
+ const struct file_operations *fops);
+
struct dentry *tracing_init_dentry(void);
void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
struct ring_buffer_event;
struct ring_buffer_event *trace_buffer_lock_reserve(struct trace_array *tr,
- unsigned char type,
+ int type,
unsigned long len,
unsigned long flags,
int pc);
@@ -484,14 +432,6 @@ void trace_buffer_unlock_commit(struct trace_array *tr,
struct ring_buffer_event *event,
unsigned long flags, int pc);
-struct ring_buffer_event *
-trace_current_buffer_lock_reserve(unsigned char type, unsigned long len,
- unsigned long flags, int pc);
-void trace_current_buffer_unlock_commit(struct ring_buffer_event *event,
- unsigned long flags, int pc);
-void trace_nowake_buffer_unlock_commit(struct ring_buffer_event *event,
- unsigned long flags, int pc);
-
struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
struct trace_array_cpu *data);
@@ -514,7 +454,6 @@ void tracing_sched_switch_trace(struct trace_array *tr,
struct task_struct *prev,
struct task_struct *next,
unsigned long flags, int pc);
-void tracing_record_cmdline(struct task_struct *tsk);
void tracing_sched_wakeup_trace(struct trace_array *tr,
struct task_struct *wakee,
@@ -599,6 +538,8 @@ extern int trace_selftest_startup_sysprof(struct tracer *trace,
struct trace_array *tr);
extern int trace_selftest_startup_branch(struct tracer *trace,
struct trace_array *tr);
+extern int trace_selftest_startup_hw_branches(struct tracer *trace,
+ struct trace_array *tr);
#endif /* CONFIG_FTRACE_STARTUP_TEST */
extern void *head_page(struct trace_array_cpu *data);
@@ -613,6 +554,8 @@ extern unsigned long trace_flags;
/* Standard output formatting function used for function return traces */
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
extern enum print_line_t print_graph_function(struct trace_iterator *iter);
+extern enum print_line_t
+trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
#ifdef CONFIG_DYNAMIC_FTRACE
/* TODO: make this variable */
@@ -644,7 +587,6 @@ static inline int ftrace_graph_addr(unsigned long addr)
return 1;
}
#endif /* CONFIG_DYNAMIC_FTRACE */
-
#else /* CONFIG_FUNCTION_GRAPH_TRACER */
static inline enum print_line_t
print_graph_function(struct trace_iterator *iter)
@@ -692,6 +634,7 @@ enum trace_iterator_flags {
TRACE_ITER_LATENCY_FMT = 0x40000,
TRACE_ITER_GLOBAL_CLK = 0x80000,
TRACE_ITER_SLEEP_TIME = 0x100000,
+ TRACE_ITER_GRAPH_TIME = 0x200000,
};
/*
@@ -790,103 +733,113 @@ struct ftrace_event_field {
char *type;
int offset;
int size;
+ int is_signed;
};
-struct ftrace_event_call {
- char *name;
- char *system;
- struct dentry *dir;
- int enabled;
- int (*regfunc)(void);
- void (*unregfunc)(void);
- int id;
- int (*raw_init)(void);
- int (*show_format)(struct trace_seq *s);
- int (*define_fields)(void);
- struct list_head fields;
+struct event_filter {
+ int n_preds;
struct filter_pred **preds;
-
-#ifdef CONFIG_EVENT_PROFILE
- atomic_t profile_count;
- int (*profile_enable)(struct ftrace_event_call *);
- void (*profile_disable)(struct ftrace_event_call *);
-#endif
+ char *filter_string;
};
struct event_subsystem {
struct list_head list;
const char *name;
struct dentry *entry;
- struct filter_pred **preds;
+ void *filter;
};
-#define events_for_each(event) \
- for (event = __start_ftrace_events; \
- (unsigned long)event < (unsigned long)__stop_ftrace_events; \
- event++)
-
-#define MAX_FILTER_PRED 8
-
struct filter_pred;
-typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
+typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event,
+ int val1, int val2);
struct filter_pred {
filter_pred_fn_t fn;
u64 val;
- char *str_val;
+ char str_val[MAX_FILTER_STR_VAL];
int str_len;
char *field_name;
int offset;
int not;
- int or;
- int compound;
- int clear;
+ int op;
+ int pop_n;
};
-int trace_define_field(struct ftrace_event_call *call, char *type,
- char *name, int offset, int size);
-extern void filter_free_pred(struct filter_pred *pred);
-extern void filter_print_preds(struct filter_pred **preds,
+extern void print_event_filter(struct ftrace_event_call *call,
struct trace_seq *s);
-extern int filter_parse(char **pbuf, struct filter_pred *pred);
-extern int filter_add_pred(struct ftrace_event_call *call,
- struct filter_pred *pred);
-extern void filter_free_preds(struct ftrace_event_call *call);
-extern int filter_match_preds(struct ftrace_event_call *call, void *rec);
-extern void filter_free_subsystem_preds(struct event_subsystem *system);
-extern int filter_add_subsystem_pred(struct event_subsystem *system,
- struct filter_pred *pred);
-
-void event_trace_printk(unsigned long ip, const char *fmt, ...);
-extern struct ftrace_event_call __start_ftrace_events[];
-extern struct ftrace_event_call __stop_ftrace_events[];
-
-#define for_each_event(event) \
- for (event = __start_ftrace_events; \
- (unsigned long)event < (unsigned long)__stop_ftrace_events; \
- event++)
+extern int apply_event_filter(struct ftrace_event_call *call,
+ char *filter_string);
+extern int apply_subsystem_event_filter(struct event_subsystem *system,
+ char *filter_string);
+extern void print_subsystem_event_filter(struct event_subsystem *system,
+ struct trace_seq *s);
+
+static inline int
+filter_check_discard(struct ftrace_event_call *call, void *rec,
+ struct ring_buffer *buffer,
+ struct ring_buffer_event *event)
+{
+ if (unlikely(call->filter_active) && !filter_match_preds(call, rec)) {
+ ring_buffer_discard_commit(buffer, event);
+ return 1;
+ }
+
+ return 0;
+}
+
+#define DEFINE_COMPARISON_PRED(type) \
+static int filter_pred_##type(struct filter_pred *pred, void *event, \
+ int val1, int val2) \
+{ \
+ type *addr = (type *)(event + pred->offset); \
+ type val = (type)pred->val; \
+ int match = 0; \
+ \
+ switch (pred->op) { \
+ case OP_LT: \
+ match = (*addr < val); \
+ break; \
+ case OP_LE: \
+ match = (*addr <= val); \
+ break; \
+ case OP_GT: \
+ match = (*addr > val); \
+ break; \
+ case OP_GE: \
+ match = (*addr >= val); \
+ break; \
+ default: \
+ break; \
+ } \
+ \
+ return match; \
+}
+
+#define DEFINE_EQUALITY_PRED(size) \
+static int filter_pred_##size(struct filter_pred *pred, void *event, \
+ int val1, int val2) \
+{ \
+ u##size *addr = (u##size *)(event + pred->offset); \
+ u##size val = (u##size)pred->val; \
+ int match; \
+ \
+ match = (val == *addr) ^ pred->not; \
+ \
+ return match; \
+}
+
+extern struct mutex event_mutex;
+extern struct list_head ftrace_events;
extern const char *__start___trace_bprintk_fmt[];
extern const char *__stop___trace_bprintk_fmt[];
-/*
- * The double __builtin_constant_p is because gcc will give us an error
- * if we try to allocate the static variable to fmt if it is not a
- * constant. Even with the outer if statement optimizing out.
- */
-#define event_trace_printk(ip, fmt, args...) \
-do { \
- __trace_printk_check_format(fmt, ##args); \
- tracing_record_cmdline(current); \
- if (__builtin_constant_p(fmt)) { \
- static const char *trace_printk_fmt \
- __attribute__((section("__trace_printk_fmt"))) = \
- __builtin_constant_p(fmt) ? fmt : NULL; \
- \
- __trace_bprintk(ip, trace_printk_fmt, ##args); \
- } else \
- __trace_printk(ip, fmt, ##args); \
-} while (0)
+#undef TRACE_EVENT_FORMAT
+#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
+ extern struct ftrace_event_call event_##call;
+#undef TRACE_EVENT_FORMAT_NOFILTER
+#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, tpfmt)
+#include "trace_event_types.h"
#endif /* _LINUX_KERNEL_TRACE_H */
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index 7a30fc4..a29ef23 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c
@@ -9,6 +9,7 @@
#include <linux/debugfs.h>
#include <linux/ftrace.h>
#include <linux/kallsyms.h>
+#include <linux/time.h>
#include "trace.h"
#include "trace_output.h"
@@ -67,7 +68,7 @@ initcall_call_print_line(struct trace_iterator *iter)
trace_assign_type(field, entry);
call = &field->boot_call;
ts = iter->ts;
- nsec_rem = do_div(ts, 1000000000);
+ nsec_rem = do_div(ts, NSEC_PER_SEC);
ret = trace_seq_printf(s, "[%5ld.%09ld] calling %s @ %i\n",
(unsigned long)ts, nsec_rem, call->func, call->caller);
@@ -92,7 +93,7 @@ initcall_ret_print_line(struct trace_iterator *iter)
trace_assign_type(field, entry);
init_ret = &field->boot_ret;
ts = iter->ts;
- nsec_rem = do_div(ts, 1000000000);
+ nsec_rem = do_div(ts, NSEC_PER_SEC);
ret = trace_seq_printf(s, "[%5ld.%09ld] initcall %s "
"returned %d after %llu msecs\n",
diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c
index 8333715..7a7a9fd 100644
--- a/kernel/trace/trace_branch.c
+++ b/kernel/trace/trace_branch.c
@@ -30,6 +30,7 @@ static struct trace_array *branch_tracer;
static void
probe_likely_condition(struct ftrace_branch_data *f, int val, int expect)
{
+ struct ftrace_event_call *call = &event_branch;
struct trace_array *tr = branch_tracer;
struct ring_buffer_event *event;
struct trace_branch *entry;
@@ -73,7 +74,8 @@ probe_likely_condition(struct ftrace_branch_data *f, int val, int expect)
entry->line = f->line;
entry->correct = val == expect;
- ring_buffer_unlock_commit(tr->buffer, event);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ ring_buffer_unlock_commit(tr->buffer, event);
out:
atomic_dec(&tr->data[cpu]->disabled);
@@ -271,7 +273,7 @@ static int branch_stat_show(struct seq_file *m, void *v)
return 0;
}
-static void *annotated_branch_stat_start(void)
+static void *annotated_branch_stat_start(struct tracer_stat *trace)
{
return __start_annotated_branch_profile;
}
@@ -346,7 +348,7 @@ static int all_branch_stat_headers(struct seq_file *m)
return 0;
}
-static void *all_branch_stat_start(void)
+static void *all_branch_stat_start(struct tracer_stat *trace)
{
return __start_branch_profile;
}
diff --git a/kernel/trace/trace_event_profile.c b/kernel/trace/trace_event_profile.c
index 22cba99..5b5895a 100644
--- a/kernel/trace/trace_event_profile.c
+++ b/kernel/trace/trace_event_profile.c
@@ -10,22 +10,30 @@
int ftrace_profile_enable(int event_id)
{
struct ftrace_event_call *event;
+ int ret = -EINVAL;
- for_each_event(event) {
- if (event->id == event_id)
- return event->profile_enable(event);
+ mutex_lock(&event_mutex);
+ list_for_each_entry(event, &ftrace_events, list) {
+ if (event->id == event_id) {
+ ret = event->profile_enable(event);
+ break;
+ }
}
+ mutex_unlock(&event_mutex);
- return -EINVAL;
+ return ret;
}
void ftrace_profile_disable(int event_id)
{
struct ftrace_event_call *event;
- for_each_event(event) {
- if (event->id == event_id)
- return event->profile_disable(event);
+ mutex_lock(&event_mutex);
+ list_for_each_entry(event, &ftrace_events, list) {
+ if (event->id == event_id) {
+ event->profile_disable(event);
+ break;
+ }
}
+ mutex_unlock(&event_mutex);
}
-
diff --git a/kernel/trace/trace_event_types.h b/kernel/trace/trace_event_types.h
index fd78bee..5e32e37 100644
--- a/kernel/trace/trace_event_types.h
+++ b/kernel/trace/trace_event_types.h
@@ -57,7 +57,7 @@ TRACE_EVENT_FORMAT(context_switch, TRACE_CTX, ctx_switch_entry, ignore,
TP_RAW_FMT("%u:%u:%u ==+ %u:%u:%u [%03u]")
);
-TRACE_EVENT_FORMAT(special, TRACE_SPECIAL, special_entry, ignore,
+TRACE_EVENT_FORMAT_NOFILTER(special, TRACE_SPECIAL, special_entry, ignore,
TRACE_STRUCT(
TRACE_FIELD(unsigned long, arg1, arg1)
TRACE_FIELD(unsigned long, arg2, arg2)
@@ -122,8 +122,10 @@ TRACE_EVENT_FORMAT(print, TRACE_PRINT, print_entry, ignore,
TRACE_EVENT_FORMAT(branch, TRACE_BRANCH, trace_branch, ignore,
TRACE_STRUCT(
TRACE_FIELD(unsigned int, line, line)
- TRACE_FIELD_SPECIAL(char func[TRACE_FUNC_SIZE+1], func, func)
- TRACE_FIELD_SPECIAL(char file[TRACE_FUNC_SIZE+1], file, file)
+ TRACE_FIELD_SPECIAL(char func[TRACE_FUNC_SIZE+1], func,
+ TRACE_FUNC_SIZE+1, func)
+ TRACE_FIELD_SPECIAL(char file[TRACE_FUNC_SIZE+1], file,
+ TRACE_FUNC_SIZE+1, file)
TRACE_FIELD(char, correct, correct)
),
TP_RAW_FMT("%u:%s:%s (%u)")
@@ -139,8 +141,8 @@ TRACE_EVENT_FORMAT(hw_branch, TRACE_HW_BRANCHES, hw_branch_entry, ignore,
TRACE_EVENT_FORMAT(power, TRACE_POWER, trace_power, ignore,
TRACE_STRUCT(
- TRACE_FIELD(ktime_t, state_data.stamp, stamp)
- TRACE_FIELD(ktime_t, state_data.end, end)
+ TRACE_FIELD_SIGN(ktime_t, state_data.stamp, stamp, 1)
+ TRACE_FIELD_SIGN(ktime_t, state_data.end, end, 1)
TRACE_FIELD(int, state_data.type, type)
TRACE_FIELD(int, state_data.state, state)
),
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 576f4fa..aa08be6 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -8,19 +8,25 @@
*
*/
+#include <linux/workqueue.h>
+#include <linux/spinlock.h>
+#include <linux/kthread.h>
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/module.h>
#include <linux/ctype.h>
+#include <linux/delay.h>
#include "trace_output.h"
#define TRACE_SYSTEM "TRACE_SYSTEM"
-static DEFINE_MUTEX(event_mutex);
+DEFINE_MUTEX(event_mutex);
+
+LIST_HEAD(ftrace_events);
int trace_define_field(struct ftrace_event_call *call, char *type,
- char *name, int offset, int size)
+ char *name, int offset, int size, int is_signed)
{
struct ftrace_event_field *field;
@@ -38,6 +44,7 @@ int trace_define_field(struct ftrace_event_call *call, char *type,
field->offset = offset;
field->size = size;
+ field->is_signed = is_signed;
list_add(&field->link, &call->fields);
return 0;
@@ -51,47 +58,94 @@ err:
return -ENOMEM;
}
+EXPORT_SYMBOL_GPL(trace_define_field);
-static void ftrace_clear_events(void)
-{
- struct ftrace_event_call *call = (void *)__start_ftrace_events;
-
+#ifdef CONFIG_MODULES
- while ((unsigned long)call < (unsigned long)__stop_ftrace_events) {
+static void trace_destroy_fields(struct ftrace_event_call *call)
+{
+ struct ftrace_event_field *field, *next;
- if (call->enabled) {
- call->enabled = 0;
- call->unregfunc();
- }
- call++;
+ list_for_each_entry_safe(field, next, &call->fields, link) {
+ list_del(&field->link);
+ kfree(field->type);
+ kfree(field->name);
+ kfree(field);
}
}
+#endif /* CONFIG_MODULES */
+
static void ftrace_event_enable_disable(struct ftrace_event_call *call,
int enable)
{
-
switch (enable) {
case 0:
if (call->enabled) {
call->enabled = 0;
+ tracing_stop_cmdline_record();
call->unregfunc();
}
break;
case 1:
if (!call->enabled) {
call->enabled = 1;
+ tracing_start_cmdline_record();
call->regfunc();
}
break;
}
}
+static void ftrace_clear_events(void)
+{
+ struct ftrace_event_call *call;
+
+ mutex_lock(&event_mutex);
+ list_for_each_entry(call, &ftrace_events, list) {
+ ftrace_event_enable_disable(call, 0);
+ }
+ mutex_unlock(&event_mutex);
+}
+
+/*
+ * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events.
+ */
+static int __ftrace_set_clr_event(const char *match, const char *sub,
+ const char *event, int set)
+{
+ struct ftrace_event_call *call;
+ int ret = -EINVAL;
+
+ mutex_lock(&event_mutex);
+ list_for_each_entry(call, &ftrace_events, list) {
+
+ if (!call->name || !call->regfunc)
+ continue;
+
+ if (match &&
+ strcmp(match, call->name) != 0 &&
+ strcmp(match, call->system) != 0)
+ continue;
+
+ if (sub && strcmp(sub, call->system) != 0)
+ continue;
+
+ if (event && strcmp(event, call->name) != 0)
+ continue;
+
+ ftrace_event_enable_disable(call, set);
+
+ ret = 0;
+ }
+ mutex_unlock(&event_mutex);
+
+ return ret;
+}
+
static int ftrace_set_clr_event(char *buf, int set)
{
- struct ftrace_event_call *call = __start_ftrace_events;
char *event = NULL, *sub = NULL, *match;
- int ret = -EINVAL;
/*
* The buf format can be <subsystem>:<event-name>
@@ -117,30 +171,24 @@ static int ftrace_set_clr_event(char *buf, int set)
event = NULL;
}
- mutex_lock(&event_mutex);
- for_each_event(call) {
-
- if (!call->name || !call->regfunc)
- continue;
-
- if (match &&
- strcmp(match, call->name) != 0 &&
- strcmp(match, call->system) != 0)
- continue;
-
- if (sub && strcmp(sub, call->system) != 0)
- continue;
-
- if (event && strcmp(event, call->name) != 0)
- continue;
-
- ftrace_event_enable_disable(call, set);
-
- ret = 0;
- }
- mutex_unlock(&event_mutex);
+ return __ftrace_set_clr_event(match, sub, event, set);
+}
- return ret;
+/**
+ * trace_set_clr_event - enable or disable an event
+ * @system: system name to match (NULL for any system)
+ * @event: event name to match (NULL for all events, within system)
+ * @set: 1 to enable, 0 to disable
+ *
+ * This is a way for other parts of the kernel to enable or disable
+ * event recording.
+ *
+ * Returns 0 on success, -EINVAL if the parameters do not match any
+ * registered events.
+ */
+int trace_set_clr_event(const char *system, const char *event, int set)
+{
+ return __ftrace_set_clr_event(NULL, system, event, set);
}
/* 128 should be much more than enough */
@@ -224,15 +272,17 @@ ftrace_event_write(struct file *file, const char __user *ubuf,
static void *
t_next(struct seq_file *m, void *v, loff_t *pos)
{
- struct ftrace_event_call *call = m->private;
- struct ftrace_event_call *next = call;
+ struct list_head *list = m->private;
+ struct ftrace_event_call *call;
(*pos)++;
for (;;) {
- if ((unsigned long)call >= (unsigned long)__stop_ftrace_events)
+ if (list == &ftrace_events)
return NULL;
+ call = list_entry(list, struct ftrace_event_call, list);
+
/*
* The ftrace subsystem is for showing formats only.
* They can not be enabled or disabled via the event files.
@@ -240,45 +290,51 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
if (call->regfunc)
break;
- call++;
- next = call;
+ list = list->next;
}
- m->private = ++next;
+ m->private = list->next;
return call;
}
static void *t_start(struct seq_file *m, loff_t *pos)
{
+ mutex_lock(&event_mutex);
+ if (*pos == 0)
+ m->private = ftrace_events.next;
return t_next(m, NULL, pos);
}
static void *
s_next(struct seq_file *m, void *v, loff_t *pos)
{
- struct ftrace_event_call *call = m->private;
- struct ftrace_event_call *next;
+ struct list_head *list = m->private;
+ struct ftrace_event_call *call;
(*pos)++;
retry:
- if ((unsigned long)call >= (unsigned long)__stop_ftrace_events)
+ if (list == &ftrace_events)
return NULL;
+ call = list_entry(list, struct ftrace_event_call, list);
+
if (!call->enabled) {
- call++;
+ list = list->next;
goto retry;
}
- next = call;
- m->private = ++next;
+ m->private = list->next;
return call;
}
static void *s_start(struct seq_file *m, loff_t *pos)
{
+ mutex_lock(&event_mutex);
+ if (*pos == 0)
+ m->private = ftrace_events.next;
return s_next(m, NULL, pos);
}
@@ -295,12 +351,12 @@ static int t_show(struct seq_file *m, void *v)
static void t_stop(struct seq_file *m, void *p)
{
+ mutex_unlock(&event_mutex);
}
static int
ftrace_event_seq_open(struct inode *inode, struct file *file)
{
- int ret;
const struct seq_operations *seq_ops;
if ((file->f_mode & FMODE_WRITE) &&
@@ -308,13 +364,7 @@ ftrace_event_seq_open(struct inode *inode, struct file *file)
ftrace_clear_events();
seq_ops = inode->i_private;
- ret = seq_open(file, seq_ops);
- if (!ret) {
- struct seq_file *m = file->private_data;
-
- m->private = __start_ftrace_events;
- }
- return ret;
+ return seq_open(file, seq_ops);
}
static ssize_t
@@ -374,8 +424,93 @@ event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
return cnt;
}
+static ssize_t
+system_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
+ loff_t *ppos)
+{
+ const char set_to_char[4] = { '?', '0', '1', 'X' };
+ const char *system = filp->private_data;
+ struct ftrace_event_call *call;
+ char buf[2];
+ int set = 0;
+ int ret;
+
+ mutex_lock(&event_mutex);
+ list_for_each_entry(call, &ftrace_events, list) {
+ if (!call->name || !call->regfunc)
+ continue;
+
+ if (system && strcmp(call->system, system) != 0)
+ continue;
+
+ /*
+ * We need to find out if all the events are set
+ * or if all events or cleared, or if we have
+ * a mixture.
+ */
+ set |= (1 << !!call->enabled);
+
+ /*
+ * If we have a mixture, no need to look further.
+ */
+ if (set == 3)
+ break;
+ }
+ mutex_unlock(&event_mutex);
+
+ buf[0] = set_to_char[set];
+ buf[1] = '\n';
+
+ ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
+
+ return ret;
+}
+
+static ssize_t
+system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
+ loff_t *ppos)
+{
+ const char *system = filp->private_data;
+ unsigned long val;
+ char buf[64];
+ ssize_t ret;
+
+ if (cnt >= sizeof(buf))
+ return -EINVAL;
+
+ if (copy_from_user(&buf, ubuf, cnt))
+ return -EFAULT;
+
+ buf[cnt] = 0;
+
+ ret = strict_strtoul(buf, 10, &val);
+ if (ret < 0)
+ return ret;
+
+ ret = tracing_update_buffers();
+ if (ret < 0)
+ return ret;
+
+ if (val != 0 && val != 1)
+ return -EINVAL;
+
+ ret = __ftrace_set_clr_event(NULL, system, NULL, val);
+ if (ret)
+ goto out;
+
+ ret = cnt;
+
+out:
+ *ppos += cnt;
+
+ return ret;
+}
+
+extern char *__bad_type_size(void);
+
#undef FIELD
#define FIELD(type, name) \
+ sizeof(type) != sizeof(field.name) ? __bad_type_size() : \
#type, "common_" #name, offsetof(typeof(field), name), \
sizeof(field.name)
@@ -391,7 +526,7 @@ static int trace_write_header(struct trace_seq *s)
"\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
"\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
"\n",
- FIELD(unsigned char, type),
+ FIELD(unsigned short, type),
FIELD(unsigned char, flags),
FIELD(unsigned char, preempt_count),
FIELD(int, pid),
@@ -481,7 +616,7 @@ event_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
trace_seq_init(s);
- filter_print_preds(call->preds, s);
+ print_event_filter(call, s);
r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
kfree(s);
@@ -494,38 +629,26 @@ event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
loff_t *ppos)
{
struct ftrace_event_call *call = filp->private_data;
- char buf[64], *pbuf = buf;
- struct filter_pred *pred;
+ char *buf;
int err;
- if (cnt >= sizeof(buf))
+ if (cnt >= PAGE_SIZE)
return -EINVAL;
- if (copy_from_user(&buf, ubuf, cnt))
- return -EFAULT;
- buf[cnt] = '\0';
-
- pred = kzalloc(sizeof(*pred), GFP_KERNEL);
- if (!pred)
+ buf = (char *)__get_free_page(GFP_TEMPORARY);
+ if (!buf)
return -ENOMEM;
- err = filter_parse(&pbuf, pred);
- if (err < 0) {
- filter_free_pred(pred);
- return err;
- }
-
- if (pred->clear) {
- filter_free_preds(call);
- filter_free_pred(pred);
- return cnt;
+ if (copy_from_user(buf, ubuf, cnt)) {
+ free_page((unsigned long) buf);
+ return -EFAULT;
}
+ buf[cnt] = '\0';
- err = filter_add_pred(call, pred);
- if (err < 0) {
- filter_free_pred(pred);
+ err = apply_event_filter(call, buf);
+ free_page((unsigned long) buf);
+ if (err < 0)
return err;
- }
*ppos += cnt;
@@ -549,7 +672,7 @@ subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
trace_seq_init(s);
- filter_print_preds(system->preds, s);
+ print_subsystem_event_filter(system, s);
r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
kfree(s);
@@ -562,45 +685,56 @@ subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
loff_t *ppos)
{
struct event_subsystem *system = filp->private_data;
- char buf[64], *pbuf = buf;
- struct filter_pred *pred;
+ char *buf;
int err;
- if (cnt >= sizeof(buf))
+ if (cnt >= PAGE_SIZE)
return -EINVAL;
- if (copy_from_user(&buf, ubuf, cnt))
- return -EFAULT;
- buf[cnt] = '\0';
-
- pred = kzalloc(sizeof(*pred), GFP_KERNEL);
- if (!pred)
+ buf = (char *)__get_free_page(GFP_TEMPORARY);
+ if (!buf)
return -ENOMEM;
- err = filter_parse(&pbuf, pred);
- if (err < 0) {
- filter_free_pred(pred);
- return err;
- }
-
- if (pred->clear) {
- filter_free_subsystem_preds(system);
- filter_free_pred(pred);
- return cnt;
+ if (copy_from_user(buf, ubuf, cnt)) {
+ free_page((unsigned long) buf);
+ return -EFAULT;
}
+ buf[cnt] = '\0';
- err = filter_add_subsystem_pred(system, pred);
- if (err < 0) {
- filter_free_subsystem_preds(system);
- filter_free_pred(pred);
+ err = apply_subsystem_event_filter(system, buf);
+ free_page((unsigned long) buf);
+ if (err < 0)
return err;
- }
*ppos += cnt;
return cnt;
}
+static ssize_t
+show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
+{
+ int (*func)(struct trace_seq *s) = filp->private_data;
+ struct trace_seq *s;
+ int r;
+
+ if (*ppos)
+ return 0;
+
+ s = kmalloc(sizeof(*s), GFP_KERNEL);
+ if (!s)
+ return -ENOMEM;
+
+ trace_seq_init(s);
+
+ func(s);
+ r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
+
+ kfree(s);
+
+ return r;
+}
+
static const struct seq_operations show_event_seq_ops = {
.start = t_start,
.next = t_next,
@@ -658,6 +792,17 @@ static const struct file_operations ftrace_subsystem_filter_fops = {
.write = subsystem_filter_write,
};
+static const struct file_operations ftrace_system_enable_fops = {
+ .open = tracing_open_generic,
+ .read = system_enable_read,
+ .write = system_enable_write,
+};
+
+static const struct file_operations ftrace_show_header_fops = {
+ .open = tracing_open_generic,
+ .read = show_header,
+};
+
static struct dentry *event_trace_events_dir(void)
{
static struct dentry *d_tracer;
@@ -684,6 +829,7 @@ static struct dentry *
event_subsystem_dir(const char *name, struct dentry *d_events)
{
struct event_subsystem *system;
+ struct dentry *entry;
/* First see if we did not already create this dir */
list_for_each_entry(system, &event_subsystems, list) {
@@ -707,16 +853,46 @@ event_subsystem_dir(const char *name, struct dentry *d_events)
return d_events;
}
- system->name = name;
+ system->name = kstrdup(name, GFP_KERNEL);
+ if (!system->name) {
+ debugfs_remove(system->entry);
+ kfree(system);
+ return d_events;
+ }
+
list_add(&system->list, &event_subsystems);
- system->preds = NULL;
+ system->filter = NULL;
+
+ system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL);
+ if (!system->filter) {
+ pr_warning("Could not allocate filter for subsystem "
+ "'%s'\n", name);
+ return system->entry;
+ }
+
+ entry = debugfs_create_file("filter", 0644, system->entry, system,
+ &ftrace_subsystem_filter_fops);
+ if (!entry) {
+ kfree(system->filter);
+ system->filter = NULL;
+ pr_warning("Could not create debugfs "
+ "'%s/filter' entry\n", name);
+ }
+
+ entry = trace_create_file("enable", 0644, system->entry,
+ (void *)system->name,
+ &ftrace_system_enable_fops);
return system->entry;
}
static int
-event_create_dir(struct ftrace_event_call *call, struct dentry *d_events)
+event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
+ const struct file_operations *id,
+ const struct file_operations *enable,
+ const struct file_operations *filter,
+ const struct file_operations *format)
{
struct dentry *entry;
int ret;
@@ -725,7 +901,7 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events)
* If the trace point header did not define TRACE_SYSTEM
* then the system would be called "TRACE_SYSTEM".
*/
- if (strcmp(call->system, "TRACE_SYSTEM") != 0)
+ if (strcmp(call->system, TRACE_SYSTEM) != 0)
d_events = event_subsystem_dir(call->system, d_events);
if (call->raw_init) {
@@ -744,21 +920,13 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events)
return -1;
}
- if (call->regfunc) {
- entry = debugfs_create_file("enable", 0644, call->dir, call,
- &ftrace_enable_fops);
- if (!entry)
- pr_warning("Could not create debugfs "
- "'%s/enable' entry\n", call->name);
- }
+ if (call->regfunc)
+ entry = trace_create_file("enable", 0644, call->dir, call,
+ enable);
- if (call->id) {
- entry = debugfs_create_file("id", 0444, call->dir, call,
- &ftrace_event_id_fops);
- if (!entry)
- pr_warning("Could not create debugfs '%s/id' entry\n",
- call->name);
- }
+ if (call->id)
+ entry = trace_create_file("id", 0444, call->dir, call,
+ id);
if (call->define_fields) {
ret = call->define_fields();
@@ -767,32 +935,195 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events)
" events/%s\n", call->name);
return ret;
}
- entry = debugfs_create_file("filter", 0644, call->dir, call,
- &ftrace_event_filter_fops);
- if (!entry)
- pr_warning("Could not create debugfs "
- "'%s/filter' entry\n", call->name);
+ entry = trace_create_file("filter", 0644, call->dir, call,
+ filter);
}
/* A trace may not want to export its format */
if (!call->show_format)
return 0;
- entry = debugfs_create_file("format", 0444, call->dir, call,
- &ftrace_event_format_fops);
- if (!entry)
- pr_warning("Could not create debugfs "
- "'%s/format' entry\n", call->name);
+ entry = trace_create_file("format", 0444, call->dir, call,
+ format);
+
+ return 0;
+}
+
+#define for_each_event(event, start, end) \
+ for (event = start; \
+ (unsigned long)event < (unsigned long)end; \
+ event++)
+
+#ifdef CONFIG_MODULES
+
+static LIST_HEAD(ftrace_module_file_list);
+
+/*
+ * Modules must own their file_operations to keep up with
+ * reference counting.
+ */
+struct ftrace_module_file_ops {
+ struct list_head list;
+ struct module *mod;
+ struct file_operations id;
+ struct file_operations enable;
+ struct file_operations format;
+ struct file_operations filter;
+};
+
+static struct ftrace_module_file_ops *
+trace_create_file_ops(struct module *mod)
+{
+ struct ftrace_module_file_ops *file_ops;
+
+ /*
+ * This is a bit of a PITA. To allow for correct reference
+ * counting, modules must "own" their file_operations.
+ * To do this, we allocate the file operations that will be
+ * used in the event directory.
+ */
+
+ file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL);
+ if (!file_ops)
+ return NULL;
+
+ file_ops->mod = mod;
+
+ file_ops->id = ftrace_event_id_fops;
+ file_ops->id.owner = mod;
+
+ file_ops->enable = ftrace_enable_fops;
+ file_ops->enable.owner = mod;
+
+ file_ops->filter = ftrace_event_filter_fops;
+ file_ops->filter.owner = mod;
+
+ file_ops->format = ftrace_event_format_fops;
+ file_ops->format.owner = mod;
+
+ list_add(&file_ops->list, &ftrace_module_file_list);
+
+ return file_ops;
+}
+
+static void trace_module_add_events(struct module *mod)
+{
+ struct ftrace_module_file_ops *file_ops = NULL;
+ struct ftrace_event_call *call, *start, *end;
+ struct dentry *d_events;
+
+ start = mod->trace_events;
+ end = mod->trace_events + mod->num_trace_events;
+
+ if (start == end)
+ return;
+
+ d_events = event_trace_events_dir();
+ if (!d_events)
+ return;
+
+ for_each_event(call, start, end) {
+ /* The linker may leave blanks */
+ if (!call->name)
+ continue;
+
+ /*
+ * This module has events, create file ops for this module
+ * if not already done.
+ */
+ if (!file_ops) {
+ file_ops = trace_create_file_ops(mod);
+ if (!file_ops)
+ return;
+ }
+ call->mod = mod;
+ list_add(&call->list, &ftrace_events);
+ event_create_dir(call, d_events,
+ &file_ops->id, &file_ops->enable,
+ &file_ops->filter, &file_ops->format);
+ }
+}
+
+static void trace_module_remove_events(struct module *mod)
+{
+ struct ftrace_module_file_ops *file_ops;
+ struct ftrace_event_call *call, *p;
+ bool found = false;
+
+ down_write(&trace_event_mutex);
+ list_for_each_entry_safe(call, p, &ftrace_events, list) {
+ if (call->mod == mod) {
+ found = true;
+ ftrace_event_enable_disable(call, 0);
+ if (call->event)
+ __unregister_ftrace_event(call->event);
+ debugfs_remove_recursive(call->dir);
+ list_del(&call->list);
+ trace_destroy_fields(call);
+ destroy_preds(call);
+ }
+ }
+
+ /* Now free the file_operations */
+ list_for_each_entry(file_ops, &ftrace_module_file_list, list) {
+ if (file_ops->mod == mod)
+ break;
+ }
+ if (&file_ops->list != &ftrace_module_file_list) {
+ list_del(&file_ops->list);
+ kfree(file_ops);
+ }
+
+ /*
+ * It is safest to reset the ring buffer if the module being unloaded
+ * registered any events.
+ */
+ if (found)
+ tracing_reset_current_online_cpus();
+ up_write(&trace_event_mutex);
+}
+
+static int trace_module_notify(struct notifier_block *self,
+ unsigned long val, void *data)
+{
+ struct module *mod = data;
+
+ mutex_lock(&event_mutex);
+ switch (val) {
+ case MODULE_STATE_COMING:
+ trace_module_add_events(mod);
+ break;
+ case MODULE_STATE_GOING:
+ trace_module_remove_events(mod);
+ break;
+ }
+ mutex_unlock(&event_mutex);
return 0;
}
+#else
+static int trace_module_notify(struct notifier_block *self,
+ unsigned long val, void *data)
+{
+ return 0;
+}
+#endif /* CONFIG_MODULES */
+
+struct notifier_block trace_module_nb = {
+ .notifier_call = trace_module_notify,
+ .priority = 0,
+};
+
+extern struct ftrace_event_call __start_ftrace_events[];
+extern struct ftrace_event_call __stop_ftrace_events[];
static __init int event_trace_init(void)
{
- struct ftrace_event_call *call = __start_ftrace_events;
+ struct ftrace_event_call *call;
struct dentry *d_tracer;
struct dentry *entry;
struct dentry *d_events;
+ int ret;
d_tracer = tracing_init_dentry();
if (!d_tracer)
@@ -816,13 +1147,243 @@ static __init int event_trace_init(void)
if (!d_events)
return 0;
- for_each_event(call) {
+ /* ring buffer internal formats */
+ trace_create_file("header_page", 0444, d_events,
+ ring_buffer_print_page_header,
+ &ftrace_show_header_fops);
+
+ trace_create_file("header_event", 0444, d_events,
+ ring_buffer_print_entry_header,
+ &ftrace_show_header_fops);
+
+ trace_create_file("enable", 0644, d_events,
+ NULL, &ftrace_system_enable_fops);
+
+ for_each_event(call, __start_ftrace_events, __stop_ftrace_events) {
/* The linker may leave blanks */
if (!call->name)
continue;
- event_create_dir(call, d_events);
+ list_add(&call->list, &ftrace_events);
+ event_create_dir(call, d_events, &ftrace_event_id_fops,
+ &ftrace_enable_fops, &ftrace_event_filter_fops,
+ &ftrace_event_format_fops);
}
+ ret = register_module_notifier(&trace_module_nb);
+ if (ret)
+ pr_warning("Failed to register trace events module notifier\n");
+
return 0;
}
fs_initcall(event_trace_init);
+
+#ifdef CONFIG_FTRACE_STARTUP_TEST
+
+static DEFINE_SPINLOCK(test_spinlock);
+static DEFINE_SPINLOCK(test_spinlock_irq);
+static DEFINE_MUTEX(test_mutex);
+
+static __init void test_work(struct work_struct *dummy)
+{
+ spin_lock(&test_spinlock);
+ spin_lock_irq(&test_spinlock_irq);
+ udelay(1);
+ spin_unlock_irq(&test_spinlock_irq);
+ spin_unlock(&test_spinlock);
+
+ mutex_lock(&test_mutex);
+ msleep(1);
+ mutex_unlock(&test_mutex);
+}
+
+static __init int event_test_thread(void *unused)
+{
+ void *test_malloc;
+
+ test_malloc = kmalloc(1234, GFP_KERNEL);
+ if (!test_malloc)
+ pr_info("failed to kmalloc\n");
+
+ schedule_on_each_cpu(test_work);
+
+ kfree(test_malloc);
+
+ set_current_state(TASK_INTERRUPTIBLE);
+ while (!kthread_should_stop())
+ schedule();
+
+ return 0;
+}
+
+/*
+ * Do various things that may trigger events.
+ */
+static __init void event_test_stuff(void)
+{
+ struct task_struct *test_thread;
+
+ test_thread = kthread_run(event_test_thread, NULL, "test-events");
+ msleep(1);
+ kthread_stop(test_thread);
+}
+
+/*
+ * For every trace event defined, we will test each trace point separately,
+ * and then by groups, and finally all trace points.
+ */
+static __init void event_trace_self_tests(void)
+{
+ struct ftrace_event_call *call;
+ struct event_subsystem *system;
+ int ret;
+
+ pr_info("Running tests on trace events:\n");
+
+ list_for_each_entry(call, &ftrace_events, list) {
+
+ /* Only test those that have a regfunc */
+ if (!call->regfunc)
+ continue;
+
+ pr_info("Testing event %s: ", call->name);
+
+ /*
+ * If an event is already enabled, someone is using
+ * it and the self test should not be on.
+ */
+ if (call->enabled) {
+ pr_warning("Enabled event during self test!\n");
+ WARN_ON_ONCE(1);
+ continue;
+ }
+
+ ftrace_event_enable_disable(call, 1);
+ event_test_stuff();
+ ftrace_event_enable_disable(call, 0);
+
+ pr_cont("OK\n");
+ }
+
+ /* Now test at the sub system level */
+
+ pr_info("Running tests on trace event systems:\n");
+
+ list_for_each_entry(system, &event_subsystems, list) {
+
+ /* the ftrace system is special, skip it */
+ if (strcmp(system->name, "ftrace") == 0)
+ continue;
+
+ pr_info("Testing event system %s: ", system->name);
+
+ ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1);
+ if (WARN_ON_ONCE(ret)) {
+ pr_warning("error enabling system %s\n",
+ system->name);
+ continue;
+ }
+
+ event_test_stuff();
+
+ ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0);
+ if (WARN_ON_ONCE(ret))
+ pr_warning("error disabling system %s\n",
+ system->name);
+
+ pr_cont("OK\n");
+ }
+
+ /* Test with all events enabled */
+
+ pr_info("Running tests on all trace events:\n");
+ pr_info("Testing all events: ");
+
+ ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1);
+ if (WARN_ON_ONCE(ret)) {
+ pr_warning("error enabling all events\n");
+ return;
+ }
+
+ event_test_stuff();
+
+ /* reset sysname */
+ ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0);
+ if (WARN_ON_ONCE(ret)) {
+ pr_warning("error disabling all events\n");
+ return;
+ }
+
+ pr_cont("OK\n");
+}
+
+#ifdef CONFIG_FUNCTION_TRACER
+
+static DEFINE_PER_CPU(atomic_t, test_event_disable);
+
+static void
+function_test_events_call(unsigned long ip, unsigned long parent_ip)
+{
+ struct ring_buffer_event *event;
+ struct ftrace_entry *entry;
+ unsigned long flags;
+ long disabled;
+ int resched;
+ int cpu;
+ int pc;
+
+ pc = preempt_count();
+ resched = ftrace_preempt_disable();
+ cpu = raw_smp_processor_id();
+ disabled = atomic_inc_return(&per_cpu(test_event_disable, cpu));
+
+ if (disabled != 1)
+ goto out;
+
+ local_save_flags(flags);
+
+ event = trace_current_buffer_lock_reserve(TRACE_FN, sizeof(*entry),
+ flags, pc);
+ if (!event)
+ goto out;
+ entry = ring_buffer_event_data(event);
+ entry->ip = ip;
+ entry->parent_ip = parent_ip;
+
+ trace_nowake_buffer_unlock_commit(event, flags, pc);
+
+ out:
+ atomic_dec(&per_cpu(test_event_disable, cpu));
+ ftrace_preempt_enable(resched);
+}
+
+static struct ftrace_ops trace_ops __initdata =
+{
+ .func = function_test_events_call,
+};
+
+static __init void event_trace_self_test_with_function(void)
+{
+ register_ftrace_function(&trace_ops);
+ pr_info("Running tests again, along with the function tracer\n");
+ event_trace_self_tests();
+ unregister_ftrace_function(&trace_ops);
+}
+#else
+static __init void event_trace_self_test_with_function(void)
+{
+}
+#endif
+
+static __init int event_trace_self_tests_init(void)
+{
+
+ event_trace_self_tests();
+
+ event_trace_self_test_with_function();
+
+ return 0;
+}
+
+late_initcall(event_trace_self_tests_init);
+
+#endif
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index e03cbf1..db6e54b 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -22,119 +22,297 @@
#include <linux/uaccess.h>
#include <linux/module.h>
#include <linux/ctype.h>
+#include <linux/mutex.h>
#include "trace.h"
#include "trace_output.h"
-static int filter_pred_64(struct filter_pred *pred, void *event)
+static DEFINE_MUTEX(filter_mutex);
+
+enum filter_op_ids
+{
+ OP_OR,
+ OP_AND,
+ OP_NE,
+ OP_EQ,
+ OP_LT,
+ OP_LE,
+ OP_GT,
+ OP_GE,
+ OP_NONE,
+ OP_OPEN_PAREN,
+};
+
+struct filter_op {
+ int id;
+ char *string;
+ int precedence;
+};
+
+static struct filter_op filter_ops[] = {
+ { OP_OR, "||", 1 },
+ { OP_AND, "&&", 2 },
+ { OP_NE, "!=", 4 },
+ { OP_EQ, "==", 4 },
+ { OP_LT, "<", 5 },
+ { OP_LE, "<=", 5 },
+ { OP_GT, ">", 5 },
+ { OP_GE, ">=", 5 },
+ { OP_NONE, "OP_NONE", 0 },
+ { OP_OPEN_PAREN, "(", 0 },
+};
+
+enum {
+ FILT_ERR_NONE,
+ FILT_ERR_INVALID_OP,
+ FILT_ERR_UNBALANCED_PAREN,
+ FILT_ERR_TOO_MANY_OPERANDS,
+ FILT_ERR_OPERAND_TOO_LONG,
+ FILT_ERR_FIELD_NOT_FOUND,
+ FILT_ERR_ILLEGAL_FIELD_OP,
+ FILT_ERR_ILLEGAL_INTVAL,
+ FILT_ERR_BAD_SUBSYS_FILTER,
+ FILT_ERR_TOO_MANY_PREDS,
+ FILT_ERR_MISSING_FIELD,
+ FILT_ERR_INVALID_FILTER,
+};
+
+static char *err_text[] = {
+ "No error",
+ "Invalid operator",
+ "Unbalanced parens",
+ "Too many operands",
+ "Operand too long",
+ "Field not found",
+ "Illegal operation for field type",
+ "Illegal integer value",
+ "Couldn't find or set field in one of a subsystem's events",
+ "Too many terms in predicate expression",
+ "Missing field name and/or value",
+ "Meaningless filter expression",
+};
+
+struct opstack_op {
+ int op;
+ struct list_head list;
+};
+
+struct postfix_elt {
+ int op;
+ char *operand;
+ struct list_head list;
+};
+
+struct filter_parse_state {
+ struct filter_op *ops;
+ struct list_head opstack;
+ struct list_head postfix;
+ int lasterr;
+ int lasterr_pos;
+
+ struct {
+ char *string;
+ unsigned int cnt;
+ unsigned int tail;
+ } infix;
+
+ struct {
+ char string[MAX_FILTER_STR_VAL];
+ int pos;
+ unsigned int tail;
+ } operand;
+};
+
+DEFINE_COMPARISON_PRED(s64);
+DEFINE_COMPARISON_PRED(u64);
+DEFINE_COMPARISON_PRED(s32);
+DEFINE_COMPARISON_PRED(u32);
+DEFINE_COMPARISON_PRED(s16);
+DEFINE_COMPARISON_PRED(u16);
+DEFINE_COMPARISON_PRED(s8);
+DEFINE_COMPARISON_PRED(u8);
+
+DEFINE_EQUALITY_PRED(64);
+DEFINE_EQUALITY_PRED(32);
+DEFINE_EQUALITY_PRED(16);
+DEFINE_EQUALITY_PRED(8);
+
+static int filter_pred_and(struct filter_pred *pred __attribute((unused)),
+ void *event __attribute((unused)),
+ int val1, int val2)
+{
+ return val1 && val2;
+}
+
+static int filter_pred_or(struct filter_pred *pred __attribute((unused)),
+ void *event __attribute((unused)),
+ int val1, int val2)
+{
+ return val1 || val2;
+}
+
+/* Filter predicate for fixed sized arrays of characters */
+static int filter_pred_string(struct filter_pred *pred, void *event,
+ int val1, int val2)
{
- u64 *addr = (u64 *)(event + pred->offset);
- u64 val = (u64)pred->val;
- int match;
+ char *addr = (char *)(event + pred->offset);
+ int cmp, match;
+
+ cmp = strncmp(addr, pred->str_val, pred->str_len);
- match = (val == *addr) ^ pred->not;
+ match = (!cmp) ^ pred->not;
return match;
}
-static int filter_pred_32(struct filter_pred *pred, void *event)
+/*
+ * Filter predicate for dynamic sized arrays of characters.
+ * These are implemented through a list of strings at the end
+ * of the entry.
+ * Also each of these strings have a field in the entry which
+ * contains its offset from the beginning of the entry.
+ * We have then first to get this field, dereference it
+ * and add it to the address of the entry, and at last we have
+ * the address of the string.
+ */
+static int filter_pred_strloc(struct filter_pred *pred, void *event,
+ int val1, int val2)
{
- u32 *addr = (u32 *)(event + pred->offset);
- u32 val = (u32)pred->val;
- int match;
+ int str_loc = *(int *)(event + pred->offset);
+ char *addr = (char *)(event + str_loc);
+ int cmp, match;
+
+ cmp = strncmp(addr, pred->str_val, pred->str_len);
- match = (val == *addr) ^ pred->not;
+ match = (!cmp) ^ pred->not;
return match;
}
-static int filter_pred_16(struct filter_pred *pred, void *event)
+static int filter_pred_none(struct filter_pred *pred, void *event,
+ int val1, int val2)
+{
+ return 0;
+}
+
+/* return 1 if event matches, 0 otherwise (discard) */
+int filter_match_preds(struct ftrace_event_call *call, void *rec)
{
- u16 *addr = (u16 *)(event + pred->offset);
- u16 val = (u16)pred->val;
- int match;
+ struct event_filter *filter = call->filter;
+ int match, top = 0, val1 = 0, val2 = 0;
+ int stack[MAX_FILTER_PRED];
+ struct filter_pred *pred;
+ int i;
+
+ for (i = 0; i < filter->n_preds; i++) {
+ pred = filter->preds[i];
+ if (!pred->pop_n) {
+ match = pred->fn(pred, rec, val1, val2);
+ stack[top++] = match;
+ continue;
+ }
+ if (pred->pop_n > top) {
+ WARN_ON_ONCE(1);
+ return 0;
+ }
+ val1 = stack[--top];
+ val2 = stack[--top];
+ match = pred->fn(pred, rec, val1, val2);
+ stack[top++] = match;
+ }
- match = (val == *addr) ^ pred->not;
+ return stack[--top];
+}
+EXPORT_SYMBOL_GPL(filter_match_preds);
- return match;
+static void parse_error(struct filter_parse_state *ps, int err, int pos)
+{
+ ps->lasterr = err;
+ ps->lasterr_pos = pos;
}
-static int filter_pred_8(struct filter_pred *pred, void *event)
+static void remove_filter_string(struct event_filter *filter)
{
- u8 *addr = (u8 *)(event + pred->offset);
- u8 val = (u8)pred->val;
- int match;
+ kfree(filter->filter_string);
+ filter->filter_string = NULL;
+}
- match = (val == *addr) ^ pred->not;
+static int replace_filter_string(struct event_filter *filter,
+ char *filter_string)
+{
+ kfree(filter->filter_string);
+ filter->filter_string = kstrdup(filter_string, GFP_KERNEL);
+ if (!filter->filter_string)
+ return -ENOMEM;
- return match;
+ return 0;
}
-static int filter_pred_string(struct filter_pred *pred, void *event)
+static int append_filter_string(struct event_filter *filter,
+ char *string)
{
- char *addr = (char *)(event + pred->offset);
- int cmp, match;
+ int newlen;
+ char *new_filter_string;
- cmp = strncmp(addr, pred->str_val, pred->str_len);
+ BUG_ON(!filter->filter_string);
+ newlen = strlen(filter->filter_string) + strlen(string) + 1;
+ new_filter_string = kmalloc(newlen, GFP_KERNEL);
+ if (!new_filter_string)
+ return -ENOMEM;
- match = (!cmp) ^ pred->not;
+ strcpy(new_filter_string, filter->filter_string);
+ strcat(new_filter_string, string);
+ kfree(filter->filter_string);
+ filter->filter_string = new_filter_string;
- return match;
+ return 0;
}
-/* return 1 if event matches, 0 otherwise (discard) */
-int filter_match_preds(struct ftrace_event_call *call, void *rec)
+static void append_filter_err(struct filter_parse_state *ps,
+ struct event_filter *filter)
{
- int i, matched, and_failed = 0;
- struct filter_pred *pred;
+ int pos = ps->lasterr_pos;
+ char *buf, *pbuf;
- for (i = 0; i < MAX_FILTER_PRED; i++) {
- if (call->preds[i]) {
- pred = call->preds[i];
- if (and_failed && !pred->or)
- continue;
- matched = pred->fn(pred, rec);
- if (!matched && !pred->or) {
- and_failed = 1;
- continue;
- } else if (matched && pred->or)
- return 1;
- } else
- break;
- }
+ buf = (char *)__get_free_page(GFP_TEMPORARY);
+ if (!buf)
+ return;
- if (and_failed)
- return 0;
+ append_filter_string(filter, "\n");
+ memset(buf, ' ', PAGE_SIZE);
+ if (pos > PAGE_SIZE - 128)
+ pos = 0;
+ buf[pos] = '^';
+ pbuf = &buf[pos] + 1;
- return 1;
+ sprintf(pbuf, "\nparse_error: %s\n", err_text[ps->lasterr]);
+ append_filter_string(filter, buf);
+ free_page((unsigned long) buf);
}
-void filter_print_preds(struct filter_pred **preds, struct trace_seq *s)
+void print_event_filter(struct ftrace_event_call *call, struct trace_seq *s)
{
- char *field_name;
- struct filter_pred *pred;
- int i;
+ struct event_filter *filter = call->filter;
- if (!preds) {
+ mutex_lock(&filter_mutex);
+ if (filter->filter_string)
+ trace_seq_printf(s, "%s\n", filter->filter_string);
+ else
trace_seq_printf(s, "none\n");
- return;
- }
+ mutex_unlock(&filter_mutex);
+}
- for (i = 0; i < MAX_FILTER_PRED; i++) {
- if (preds[i]) {
- pred = preds[i];
- field_name = pred->field_name;
- if (i)
- trace_seq_printf(s, pred->or ? "|| " : "&& ");
- trace_seq_printf(s, "%s ", field_name);
- trace_seq_printf(s, pred->not ? "!= " : "== ");
- if (pred->str_val)
- trace_seq_printf(s, "%s\n", pred->str_val);
- else
- trace_seq_printf(s, "%llu\n", pred->val);
- } else
- break;
- }
+void print_subsystem_event_filter(struct event_subsystem *system,
+ struct trace_seq *s)
+{
+ struct event_filter *filter = system->filter;
+
+ mutex_lock(&filter_mutex);
+ if (filter->filter_string)
+ trace_seq_printf(s, "%s\n", filter->filter_string);
+ else
+ trace_seq_printf(s, "none\n");
+ mutex_unlock(&filter_mutex);
}
static struct ftrace_event_field *
@@ -150,284 +328,828 @@ find_event_field(struct ftrace_event_call *call, char *name)
return NULL;
}
-void filter_free_pred(struct filter_pred *pred)
+static void filter_free_pred(struct filter_pred *pred)
{
if (!pred)
return;
kfree(pred->field_name);
- kfree(pred->str_val);
kfree(pred);
}
-void filter_free_preds(struct ftrace_event_call *call)
+static void filter_clear_pred(struct filter_pred *pred)
{
- int i;
+ kfree(pred->field_name);
+ pred->field_name = NULL;
+ pred->str_len = 0;
+}
- if (call->preds) {
- for (i = 0; i < MAX_FILTER_PRED; i++)
- filter_free_pred(call->preds[i]);
- kfree(call->preds);
- call->preds = NULL;
+static int filter_set_pred(struct filter_pred *dest,
+ struct filter_pred *src,
+ filter_pred_fn_t fn)
+{
+ *dest = *src;
+ if (src->field_name) {
+ dest->field_name = kstrdup(src->field_name, GFP_KERNEL);
+ if (!dest->field_name)
+ return -ENOMEM;
}
+ dest->fn = fn;
+
+ return 0;
}
-void filter_free_subsystem_preds(struct event_subsystem *system)
+static void filter_disable_preds(struct ftrace_event_call *call)
{
- struct ftrace_event_call *call = __start_ftrace_events;
+ struct event_filter *filter = call->filter;
int i;
- if (system->preds) {
- for (i = 0; i < MAX_FILTER_PRED; i++)
- filter_free_pred(system->preds[i]);
- kfree(system->preds);
- system->preds = NULL;
- }
+ call->filter_active = 0;
+ filter->n_preds = 0;
- events_for_each(call) {
- if (!call->name || !call->regfunc)
- continue;
+ for (i = 0; i < MAX_FILTER_PRED; i++)
+ filter->preds[i]->fn = filter_pred_none;
+}
+
+void destroy_preds(struct ftrace_event_call *call)
+{
+ struct event_filter *filter = call->filter;
+ int i;
- if (!strcmp(call->system, system->name))
- filter_free_preds(call);
+ for (i = 0; i < MAX_FILTER_PRED; i++) {
+ if (filter->preds[i])
+ filter_free_pred(filter->preds[i]);
}
+ kfree(filter->preds);
+ kfree(filter);
+ call->filter = NULL;
}
-static int __filter_add_pred(struct ftrace_event_call *call,
- struct filter_pred *pred)
+int init_preds(struct ftrace_event_call *call)
{
+ struct event_filter *filter;
+ struct filter_pred *pred;
int i;
- if (call->preds && !pred->compound)
- filter_free_preds(call);
+ filter = call->filter = kzalloc(sizeof(*filter), GFP_KERNEL);
+ if (!call->filter)
+ return -ENOMEM;
- if (!call->preds) {
- call->preds = kzalloc(MAX_FILTER_PRED * sizeof(pred),
- GFP_KERNEL);
- if (!call->preds)
- return -ENOMEM;
- }
+ call->filter_active = 0;
+ filter->n_preds = 0;
+
+ filter->preds = kzalloc(MAX_FILTER_PRED * sizeof(pred), GFP_KERNEL);
+ if (!filter->preds)
+ goto oom;
for (i = 0; i < MAX_FILTER_PRED; i++) {
- if (!call->preds[i]) {
- call->preds[i] = pred;
- return 0;
+ pred = kzalloc(sizeof(*pred), GFP_KERNEL);
+ if (!pred)
+ goto oom;
+ pred->fn = filter_pred_none;
+ filter->preds[i] = pred;
+ }
+
+ return 0;
+
+oom:
+ destroy_preds(call);
+
+ return -ENOMEM;
+}
+EXPORT_SYMBOL_GPL(init_preds);
+
+static void filter_free_subsystem_preds(struct event_subsystem *system)
+{
+ struct event_filter *filter = system->filter;
+ struct ftrace_event_call *call;
+ int i;
+
+ if (filter->n_preds) {
+ for (i = 0; i < filter->n_preds; i++)
+ filter_free_pred(filter->preds[i]);
+ kfree(filter->preds);
+ filter->preds = NULL;
+ filter->n_preds = 0;
+ }
+
+ mutex_lock(&event_mutex);
+ list_for_each_entry(call, &ftrace_events, list) {
+ if (!call->define_fields)
+ continue;
+
+ if (!strcmp(call->system, system->name)) {
+ filter_disable_preds(call);
+ remove_filter_string(call->filter);
}
}
+ mutex_unlock(&event_mutex);
+}
+
+static int filter_add_pred_fn(struct filter_parse_state *ps,
+ struct ftrace_event_call *call,
+ struct filter_pred *pred,
+ filter_pred_fn_t fn)
+{
+ struct event_filter *filter = call->filter;
+ int idx, err;
+
+ if (filter->n_preds == MAX_FILTER_PRED) {
+ parse_error(ps, FILT_ERR_TOO_MANY_PREDS, 0);
+ return -ENOSPC;
+ }
+
+ idx = filter->n_preds;
+ filter_clear_pred(filter->preds[idx]);
+ err = filter_set_pred(filter->preds[idx], pred, fn);
+ if (err)
+ return err;
- return -ENOSPC;
+ filter->n_preds++;
+ call->filter_active = 1;
+
+ return 0;
}
+enum {
+ FILTER_STATIC_STRING = 1,
+ FILTER_DYN_STRING
+};
+
static int is_string_field(const char *type)
{
+ if (strstr(type, "__data_loc") && strstr(type, "char"))
+ return FILTER_DYN_STRING;
+
if (strchr(type, '[') && strstr(type, "char"))
- return 1;
+ return FILTER_STATIC_STRING;
return 0;
}
-int filter_add_pred(struct ftrace_event_call *call, struct filter_pred *pred)
+static int is_legal_op(struct ftrace_event_field *field, int op)
{
- struct ftrace_event_field *field;
-
- field = find_event_field(call, pred->field_name);
- if (!field)
- return -EINVAL;
+ if (is_string_field(field->type) && (op != OP_EQ && op != OP_NE))
+ return 0;
- pred->offset = field->offset;
+ return 1;
+}
- if (is_string_field(field->type)) {
- if (!pred->str_val)
- return -EINVAL;
- pred->fn = filter_pred_string;
- pred->str_len = field->size;
- return __filter_add_pred(call, pred);
- } else {
- if (pred->str_val)
- return -EINVAL;
- }
+static filter_pred_fn_t select_comparison_fn(int op, int field_size,
+ int field_is_signed)
+{
+ filter_pred_fn_t fn = NULL;
- switch (field->size) {
+ switch (field_size) {
case 8:
- pred->fn = filter_pred_64;
+ if (op == OP_EQ || op == OP_NE)
+ fn = filter_pred_64;
+ else if (field_is_signed)
+ fn = filter_pred_s64;
+ else
+ fn = filter_pred_u64;
break;
case 4:
- pred->fn = filter_pred_32;
+ if (op == OP_EQ || op == OP_NE)
+ fn = filter_pred_32;
+ else if (field_is_signed)
+ fn = filter_pred_s32;
+ else
+ fn = filter_pred_u32;
break;
case 2:
- pred->fn = filter_pred_16;
+ if (op == OP_EQ || op == OP_NE)
+ fn = filter_pred_16;
+ else if (field_is_signed)
+ fn = filter_pred_s16;
+ else
+ fn = filter_pred_u16;
break;
case 1:
- pred->fn = filter_pred_8;
+ if (op == OP_EQ || op == OP_NE)
+ fn = filter_pred_8;
+ else if (field_is_signed)
+ fn = filter_pred_s8;
+ else
+ fn = filter_pred_u8;
break;
- default:
- return -EINVAL;
}
- return __filter_add_pred(call, pred);
+ return fn;
}
-static struct filter_pred *copy_pred(struct filter_pred *pred)
+static int filter_add_pred(struct filter_parse_state *ps,
+ struct ftrace_event_call *call,
+ struct filter_pred *pred)
{
- struct filter_pred *new_pred = kmalloc(sizeof(*pred), GFP_KERNEL);
- if (!new_pred)
- return NULL;
+ struct ftrace_event_field *field;
+ filter_pred_fn_t fn;
+ unsigned long long val;
+ int string_type;
+
+ pred->fn = filter_pred_none;
+
+ if (pred->op == OP_AND) {
+ pred->pop_n = 2;
+ return filter_add_pred_fn(ps, call, pred, filter_pred_and);
+ } else if (pred->op == OP_OR) {
+ pred->pop_n = 2;
+ return filter_add_pred_fn(ps, call, pred, filter_pred_or);
+ }
+
+ field = find_event_field(call, pred->field_name);
+ if (!field) {
+ parse_error(ps, FILT_ERR_FIELD_NOT_FOUND, 0);
+ return -EINVAL;
+ }
- memcpy(new_pred, pred, sizeof(*pred));
+ pred->offset = field->offset;
- if (pred->field_name) {
- new_pred->field_name = kstrdup(pred->field_name, GFP_KERNEL);
- if (!new_pred->field_name) {
- kfree(new_pred);
- return NULL;
- }
+ if (!is_legal_op(field, pred->op)) {
+ parse_error(ps, FILT_ERR_ILLEGAL_FIELD_OP, 0);
+ return -EINVAL;
}
- if (pred->str_val) {
- new_pred->str_val = kstrdup(pred->str_val, GFP_KERNEL);
- if (!new_pred->str_val) {
- filter_free_pred(new_pred);
- return NULL;
+ string_type = is_string_field(field->type);
+ if (string_type) {
+ if (string_type == FILTER_STATIC_STRING)
+ fn = filter_pred_string;
+ else
+ fn = filter_pred_strloc;
+ pred->str_len = field->size;
+ if (pred->op == OP_NE)
+ pred->not = 1;
+ return filter_add_pred_fn(ps, call, pred, fn);
+ } else {
+ if (strict_strtoull(pred->str_val, 0, &val)) {
+ parse_error(ps, FILT_ERR_ILLEGAL_INTVAL, 0);
+ return -EINVAL;
}
+ pred->val = val;
+ }
+
+ fn = select_comparison_fn(pred->op, field->size, field->is_signed);
+ if (!fn) {
+ parse_error(ps, FILT_ERR_INVALID_OP, 0);
+ return -EINVAL;
}
- return new_pred;
+ if (pred->op == OP_NE)
+ pred->not = 1;
+
+ return filter_add_pred_fn(ps, call, pred, fn);
}
-int filter_add_subsystem_pred(struct event_subsystem *system,
- struct filter_pred *pred)
+static int filter_add_subsystem_pred(struct filter_parse_state *ps,
+ struct event_subsystem *system,
+ struct filter_pred *pred,
+ char *filter_string)
{
- struct ftrace_event_call *call = __start_ftrace_events;
- struct filter_pred *event_pred;
- int i;
-
- if (system->preds && !pred->compound)
- filter_free_subsystem_preds(system);
+ struct event_filter *filter = system->filter;
+ struct ftrace_event_call *call;
+ int err = 0;
- if (!system->preds) {
- system->preds = kzalloc(MAX_FILTER_PRED * sizeof(pred),
+ if (!filter->preds) {
+ filter->preds = kzalloc(MAX_FILTER_PRED * sizeof(pred),
GFP_KERNEL);
- if (!system->preds)
+
+ if (!filter->preds)
return -ENOMEM;
}
- for (i = 0; i < MAX_FILTER_PRED; i++) {
- if (!system->preds[i]) {
- system->preds[i] = pred;
- break;
- }
+ if (filter->n_preds == MAX_FILTER_PRED) {
+ parse_error(ps, FILT_ERR_TOO_MANY_PREDS, 0);
+ return -ENOSPC;
}
- if (i == MAX_FILTER_PRED)
- return -ENOSPC;
+ filter->preds[filter->n_preds] = pred;
+ filter->n_preds++;
- events_for_each(call) {
- int err;
+ mutex_lock(&event_mutex);
+ list_for_each_entry(call, &ftrace_events, list) {
- if (!call->name || !call->regfunc)
+ if (!call->define_fields)
continue;
if (strcmp(call->system, system->name))
continue;
- if (!find_event_field(call, pred->field_name))
- continue;
+ err = filter_add_pred(ps, call, pred);
+ if (err) {
+ mutex_unlock(&event_mutex);
+ filter_free_subsystem_preds(system);
+ parse_error(ps, FILT_ERR_BAD_SUBSYS_FILTER, 0);
+ goto out;
+ }
+ replace_filter_string(call->filter, filter_string);
+ }
+ mutex_unlock(&event_mutex);
+out:
+ return err;
+}
- event_pred = copy_pred(pred);
- if (!event_pred)
- goto oom;
+static void parse_init(struct filter_parse_state *ps,
+ struct filter_op *ops,
+ char *infix_string)
+{
+ memset(ps, '\0', sizeof(*ps));
- err = filter_add_pred(call, event_pred);
- if (err)
- filter_free_pred(event_pred);
- if (err == -ENOMEM)
- goto oom;
+ ps->infix.string = infix_string;
+ ps->infix.cnt = strlen(infix_string);
+ ps->ops = ops;
+
+ INIT_LIST_HEAD(&ps->opstack);
+ INIT_LIST_HEAD(&ps->postfix);
+}
+
+static char infix_next(struct filter_parse_state *ps)
+{
+ ps->infix.cnt--;
+
+ return ps->infix.string[ps->infix.tail++];
+}
+
+static char infix_peek(struct filter_parse_state *ps)
+{
+ if (ps->infix.tail == strlen(ps->infix.string))
+ return 0;
+
+ return ps->infix.string[ps->infix.tail];
+}
+
+static void infix_advance(struct filter_parse_state *ps)
+{
+ ps->infix.cnt--;
+ ps->infix.tail++;
+}
+
+static inline int is_precedence_lower(struct filter_parse_state *ps,
+ int a, int b)
+{
+ return ps->ops[a].precedence < ps->ops[b].precedence;
+}
+
+static inline int is_op_char(struct filter_parse_state *ps, char c)
+{
+ int i;
+
+ for (i = 0; strcmp(ps->ops[i].string, "OP_NONE"); i++) {
+ if (ps->ops[i].string[0] == c)
+ return 1;
}
return 0;
+}
-oom:
- system->preds[i] = NULL;
- return -ENOMEM;
+static int infix_get_op(struct filter_parse_state *ps, char firstc)
+{
+ char nextc = infix_peek(ps);
+ char opstr[3];
+ int i;
+
+ opstr[0] = firstc;
+ opstr[1] = nextc;
+ opstr[2] = '\0';
+
+ for (i = 0; strcmp(ps->ops[i].string, "OP_NONE"); i++) {
+ if (!strcmp(opstr, ps->ops[i].string)) {
+ infix_advance(ps);
+ return ps->ops[i].id;
+ }
+ }
+
+ opstr[1] = '\0';
+
+ for (i = 0; strcmp(ps->ops[i].string, "OP_NONE"); i++) {
+ if (!strcmp(opstr, ps->ops[i].string))
+ return ps->ops[i].id;
+ }
+
+ return OP_NONE;
}
-int filter_parse(char **pbuf, struct filter_pred *pred)
+static inline void clear_operand_string(struct filter_parse_state *ps)
{
- char *tmp, *tok, *val_str = NULL;
- int tok_n = 0;
+ memset(ps->operand.string, '\0', MAX_FILTER_STR_VAL);
+ ps->operand.tail = 0;
+}
- /* field ==/!= number, or/and field ==/!= number, number */
- while ((tok = strsep(pbuf, " \n"))) {
- if (tok_n == 0) {
- if (!strcmp(tok, "0")) {
- pred->clear = 1;
- return 0;
- } else if (!strcmp(tok, "&&")) {
- pred->or = 0;
- pred->compound = 1;
- } else if (!strcmp(tok, "||")) {
- pred->or = 1;
- pred->compound = 1;
- } else
- pred->field_name = tok;
- tok_n = 1;
+static inline int append_operand_char(struct filter_parse_state *ps, char c)
+{
+ if (ps->operand.tail == MAX_FILTER_STR_VAL - 1)
+ return -EINVAL;
+
+ ps->operand.string[ps->operand.tail++] = c;
+
+ return 0;
+}
+
+static int filter_opstack_push(struct filter_parse_state *ps, int op)
+{
+ struct opstack_op *opstack_op;
+
+ opstack_op = kmalloc(sizeof(*opstack_op), GFP_KERNEL);
+ if (!opstack_op)
+ return -ENOMEM;
+
+ opstack_op->op = op;
+ list_add(&opstack_op->list, &ps->opstack);
+
+ return 0;
+}
+
+static int filter_opstack_empty(struct filter_parse_state *ps)
+{
+ return list_empty(&ps->opstack);
+}
+
+static int filter_opstack_top(struct filter_parse_state *ps)
+{
+ struct opstack_op *opstack_op;
+
+ if (filter_opstack_empty(ps))
+ return OP_NONE;
+
+ opstack_op = list_first_entry(&ps->opstack, struct opstack_op, list);
+
+ return opstack_op->op;
+}
+
+static int filter_opstack_pop(struct filter_parse_state *ps)
+{
+ struct opstack_op *opstack_op;
+ int op;
+
+ if (filter_opstack_empty(ps))
+ return OP_NONE;
+
+ opstack_op = list_first_entry(&ps->opstack, struct opstack_op, list);
+ op = opstack_op->op;
+ list_del(&opstack_op->list);
+
+ kfree(opstack_op);
+
+ return op;
+}
+
+static void filter_opstack_clear(struct filter_parse_state *ps)
+{
+ while (!filter_opstack_empty(ps))
+ filter_opstack_pop(ps);
+}
+
+static char *curr_operand(struct filter_parse_state *ps)
+{
+ return ps->operand.string;
+}
+
+static int postfix_append_operand(struct filter_parse_state *ps, char *operand)
+{
+ struct postfix_elt *elt;
+
+ elt = kmalloc(sizeof(*elt), GFP_KERNEL);
+ if (!elt)
+ return -ENOMEM;
+
+ elt->op = OP_NONE;
+ elt->operand = kstrdup(operand, GFP_KERNEL);
+ if (!elt->operand) {
+ kfree(elt);
+ return -ENOMEM;
+ }
+
+ list_add_tail(&elt->list, &ps->postfix);
+
+ return 0;
+}
+
+static int postfix_append_op(struct filter_parse_state *ps, int op)
+{
+ struct postfix_elt *elt;
+
+ elt = kmalloc(sizeof(*elt), GFP_KERNEL);
+ if (!elt)
+ return -ENOMEM;
+
+ elt->op = op;
+ elt->operand = NULL;
+
+ list_add_tail(&elt->list, &ps->postfix);
+
+ return 0;
+}
+
+static void postfix_clear(struct filter_parse_state *ps)
+{
+ struct postfix_elt *elt;
+
+ while (!list_empty(&ps->postfix)) {
+ elt = list_first_entry(&ps->postfix, struct postfix_elt, list);
+ kfree(elt->operand);
+ list_del(&elt->list);
+ }
+}
+
+static int filter_parse(struct filter_parse_state *ps)
+{
+ int in_string = 0;
+ int op, top_op;
+ char ch;
+
+ while ((ch = infix_next(ps))) {
+ if (ch == '"') {
+ in_string ^= 1;
continue;
}
- if (tok_n == 1) {
- if (!pred->field_name)
- pred->field_name = tok;
- else if (!strcmp(tok, "!="))
- pred->not = 1;
- else if (!strcmp(tok, "=="))
- pred->not = 0;
- else {
- pred->field_name = NULL;
+
+ if (in_string)
+ goto parse_operand;
+
+ if (isspace(ch))
+ continue;
+
+ if (is_op_char(ps, ch)) {
+ op = infix_get_op(ps, ch);
+ if (op == OP_NONE) {
+ parse_error(ps, FILT_ERR_INVALID_OP, 0);
return -EINVAL;
}
- tok_n = 2;
+
+ if (strlen(curr_operand(ps))) {
+ postfix_append_operand(ps, curr_operand(ps));
+ clear_operand_string(ps);
+ }
+
+ while (!filter_opstack_empty(ps)) {
+ top_op = filter_opstack_top(ps);
+ if (!is_precedence_lower(ps, top_op, op)) {
+ top_op = filter_opstack_pop(ps);
+ postfix_append_op(ps, top_op);
+ continue;
+ }
+ break;
+ }
+
+ filter_opstack_push(ps, op);
continue;
}
- if (tok_n == 2) {
- if (pred->compound) {
- if (!strcmp(tok, "!="))
- pred->not = 1;
- else if (!strcmp(tok, "=="))
- pred->not = 0;
- else {
- pred->field_name = NULL;
- return -EINVAL;
- }
- } else {
- val_str = tok;
- break; /* done */
+
+ if (ch == '(') {
+ filter_opstack_push(ps, OP_OPEN_PAREN);
+ continue;
+ }
+
+ if (ch == ')') {
+ if (strlen(curr_operand(ps))) {
+ postfix_append_operand(ps, curr_operand(ps));
+ clear_operand_string(ps);
+ }
+
+ top_op = filter_opstack_pop(ps);
+ while (top_op != OP_NONE) {
+ if (top_op == OP_OPEN_PAREN)
+ break;
+ postfix_append_op(ps, top_op);
+ top_op = filter_opstack_pop(ps);
+ }
+ if (top_op == OP_NONE) {
+ parse_error(ps, FILT_ERR_UNBALANCED_PAREN, 0);
+ return -EINVAL;
}
- tok_n = 3;
continue;
}
- if (tok_n == 3) {
- val_str = tok;
- break; /* done */
+parse_operand:
+ if (append_operand_char(ps, ch)) {
+ parse_error(ps, FILT_ERR_OPERAND_TOO_LONG, 0);
+ return -EINVAL;
}
}
- if (!val_str) {
- pred->field_name = NULL;
- return -EINVAL;
+ if (strlen(curr_operand(ps)))
+ postfix_append_operand(ps, curr_operand(ps));
+
+ while (!filter_opstack_empty(ps)) {
+ top_op = filter_opstack_pop(ps);
+ if (top_op == OP_NONE)
+ break;
+ if (top_op == OP_OPEN_PAREN) {
+ parse_error(ps, FILT_ERR_UNBALANCED_PAREN, 0);
+ return -EINVAL;
+ }
+ postfix_append_op(ps, top_op);
}
- pred->field_name = kstrdup(pred->field_name, GFP_KERNEL);
- if (!pred->field_name)
- return -ENOMEM;
+ return 0;
+}
- pred->val = simple_strtoull(val_str, &tmp, 0);
- if (tmp == val_str) {
- pred->str_val = kstrdup(val_str, GFP_KERNEL);
- if (!pred->str_val)
- return -ENOMEM;
- } else if (*tmp != '\0')
+static struct filter_pred *create_pred(int op, char *operand1, char *operand2)
+{
+ struct filter_pred *pred;
+
+ pred = kzalloc(sizeof(*pred), GFP_KERNEL);
+ if (!pred)
+ return NULL;
+
+ pred->field_name = kstrdup(operand1, GFP_KERNEL);
+ if (!pred->field_name) {
+ kfree(pred);
+ return NULL;
+ }
+
+ strcpy(pred->str_val, operand2);
+ pred->str_len = strlen(operand2);
+
+ pred->op = op;
+
+ return pred;
+}
+
+static struct filter_pred *create_logical_pred(int op)
+{
+ struct filter_pred *pred;
+
+ pred = kzalloc(sizeof(*pred), GFP_KERNEL);
+ if (!pred)
+ return NULL;
+
+ pred->op = op;
+
+ return pred;
+}
+
+static int check_preds(struct filter_parse_state *ps)
+{
+ int n_normal_preds = 0, n_logical_preds = 0;
+ struct postfix_elt *elt;
+
+ list_for_each_entry(elt, &ps->postfix, list) {
+ if (elt->op == OP_NONE)
+ continue;
+
+ if (elt->op == OP_AND || elt->op == OP_OR) {
+ n_logical_preds++;
+ continue;
+ }
+ n_normal_preds++;
+ }
+
+ if (!n_normal_preds || n_logical_preds >= n_normal_preds) {
+ parse_error(ps, FILT_ERR_INVALID_FILTER, 0);
return -EINVAL;
+ }
return 0;
}
+static int replace_preds(struct event_subsystem *system,
+ struct ftrace_event_call *call,
+ struct filter_parse_state *ps,
+ char *filter_string)
+{
+ char *operand1 = NULL, *operand2 = NULL;
+ struct filter_pred *pred;
+ struct postfix_elt *elt;
+ int err;
+
+ err = check_preds(ps);
+ if (err)
+ return err;
+
+ list_for_each_entry(elt, &ps->postfix, list) {
+ if (elt->op == OP_NONE) {
+ if (!operand1)
+ operand1 = elt->operand;
+ else if (!operand2)
+ operand2 = elt->operand;
+ else {
+ parse_error(ps, FILT_ERR_TOO_MANY_OPERANDS, 0);
+ return -EINVAL;
+ }
+ continue;
+ }
+
+ if (elt->op == OP_AND || elt->op == OP_OR) {
+ pred = create_logical_pred(elt->op);
+ if (call) {
+ err = filter_add_pred(ps, call, pred);
+ filter_free_pred(pred);
+ } else
+ err = filter_add_subsystem_pred(ps, system,
+ pred, filter_string);
+ if (err)
+ return err;
+
+ operand1 = operand2 = NULL;
+ continue;
+ }
+
+ if (!operand1 || !operand2) {
+ parse_error(ps, FILT_ERR_MISSING_FIELD, 0);
+ return -EINVAL;
+ }
+
+ pred = create_pred(elt->op, operand1, operand2);
+ if (call) {
+ err = filter_add_pred(ps, call, pred);
+ filter_free_pred(pred);
+ } else
+ err = filter_add_subsystem_pred(ps, system, pred,
+ filter_string);
+ if (err)
+ return err;
+
+ operand1 = operand2 = NULL;
+ }
+
+ return 0;
+}
+
+int apply_event_filter(struct ftrace_event_call *call, char *filter_string)
+{
+ int err;
+
+ struct filter_parse_state *ps;
+
+ mutex_lock(&filter_mutex);
+
+ if (!strcmp(strstrip(filter_string), "0")) {
+ filter_disable_preds(call);
+ remove_filter_string(call->filter);
+ mutex_unlock(&filter_mutex);
+ return 0;
+ }
+
+ err = -ENOMEM;
+ ps = kzalloc(sizeof(*ps), GFP_KERNEL);
+ if (!ps)
+ goto out_unlock;
+
+ filter_disable_preds(call);
+ replace_filter_string(call->filter, filter_string);
+
+ parse_init(ps, filter_ops, filter_string);
+ err = filter_parse(ps);
+ if (err) {
+ append_filter_err(ps, call->filter);
+ goto out;
+ }
+
+ err = replace_preds(NULL, call, ps, filter_string);
+ if (err)
+ append_filter_err(ps, call->filter);
+
+out:
+ filter_opstack_clear(ps);
+ postfix_clear(ps);
+ kfree(ps);
+out_unlock:
+ mutex_unlock(&filter_mutex);
+
+ return err;
+}
+
+int apply_subsystem_event_filter(struct event_subsystem *system,
+ char *filter_string)
+{
+ int err;
+
+ struct filter_parse_state *ps;
+
+ mutex_lock(&filter_mutex);
+
+ if (!strcmp(strstrip(filter_string), "0")) {
+ filter_free_subsystem_preds(system);
+ remove_filter_string(system->filter);
+ mutex_unlock(&filter_mutex);
+ return 0;
+ }
+
+ err = -ENOMEM;
+ ps = kzalloc(sizeof(*ps), GFP_KERNEL);
+ if (!ps)
+ goto out_unlock;
+
+ filter_free_subsystem_preds(system);
+ replace_filter_string(system->filter, filter_string);
+
+ parse_init(ps, filter_ops, filter_string);
+ err = filter_parse(ps);
+ if (err) {
+ append_filter_err(ps, system->filter);
+ goto out;
+ }
+
+ err = replace_preds(system, NULL, ps, filter_string);
+ if (err)
+ append_filter_err(ps, system->filter);
+
+out:
+ filter_opstack_clear(ps);
+ postfix_clear(ps);
+ kfree(ps);
+out_unlock:
+ mutex_unlock(&filter_mutex);
+
+ return err;
+}
diff --git a/kernel/trace/trace_events_stage_1.h b/kernel/trace/trace_events_stage_1.h
deleted file mode 100644
index 38985f9..0000000
--- a/kernel/trace/trace_events_stage_1.h
+++ /dev/null
@@ -1,39 +0,0 @@
-/*
- * Stage 1 of the trace events.
- *
- * Override the macros in <trace/trace_event_types.h> to include the following:
- *
- * struct ftrace_raw_<call> {
- * struct trace_entry ent;
- * <type> <item>;
- * <type2> <item2>[<len>];
- * [...]
- * };
- *
- * The <type> <item> is created by the __field(type, item) macro or
- * the __array(type2, item2, len) macro.
- * We simply do "type item;", and that will create the fields
- * in the structure.
- */
-
-#undef TRACE_FORMAT
-#define TRACE_FORMAT(call, proto, args, fmt)
-
-#undef __array
-#define __array(type, item, len) type item[len];
-
-#undef __field
-#define __field(type, item) type item;
-
-#undef TP_STRUCT__entry
-#define TP_STRUCT__entry(args...) args
-
-#undef TRACE_EVENT
-#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
- struct ftrace_raw_##name { \
- struct trace_entry ent; \
- tstruct \
- }; \
- static struct ftrace_event_call event_##name
-
-#include <trace/trace_event_types.h>
diff --git a/kernel/trace/trace_events_stage_2.h b/kernel/trace/trace_events_stage_2.h
deleted file mode 100644
index d363c66..0000000
--- a/kernel/trace/trace_events_stage_2.h
+++ /dev/null
@@ -1,176 +0,0 @@
-/*
- * Stage 2 of the trace events.
- *
- * Override the macros in <trace/trace_event_types.h> to include the following:
- *
- * enum print_line_t
- * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
- * {
- * struct trace_seq *s = &iter->seq;
- * struct ftrace_raw_<call> *field; <-- defined in stage 1
- * struct trace_entry *entry;
- * int ret;
- *
- * entry = iter->ent;
- *
- * if (entry->type != event_<call>.id) {
- * WARN_ON_ONCE(1);
- * return TRACE_TYPE_UNHANDLED;
- * }
- *
- * field = (typeof(field))entry;
- *
- * ret = trace_seq_printf(s, <TP_printk> "\n");
- * if (!ret)
- * return TRACE_TYPE_PARTIAL_LINE;
- *
- * return TRACE_TYPE_HANDLED;
- * }
- *
- * This is the method used to print the raw event to the trace
- * output format. Note, this is not needed if the data is read
- * in binary.
- */
-
-#undef __entry
-#define __entry field
-
-#undef TP_printk
-#define TP_printk(fmt, args...) fmt "\n", args
-
-#undef TRACE_EVENT
-#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
-enum print_line_t \
-ftrace_raw_output_##call(struct trace_iterator *iter, int flags) \
-{ \
- struct trace_seq *s = &iter->seq; \
- struct ftrace_raw_##call *field; \
- struct trace_entry *entry; \
- int ret; \
- \
- entry = iter->ent; \
- \
- if (entry->type != event_##call.id) { \
- WARN_ON_ONCE(1); \
- return TRACE_TYPE_UNHANDLED; \
- } \
- \
- field = (typeof(field))entry; \
- \
- ret = trace_seq_printf(s, #call ": " print); \
- if (!ret) \
- return TRACE_TYPE_PARTIAL_LINE; \
- \
- return TRACE_TYPE_HANDLED; \
-}
-
-#include <trace/trace_event_types.h>
-
-/*
- * Setup the showing format of trace point.
- *
- * int
- * ftrace_format_##call(struct trace_seq *s)
- * {
- * struct ftrace_raw_##call field;
- * int ret;
- *
- * ret = trace_seq_printf(s, #type " " #item ";"
- * " offset:%u; size:%u;\n",
- * offsetof(struct ftrace_raw_##call, item),
- * sizeof(field.type));
- *
- * }
- */
-
-#undef TP_STRUCT__entry
-#define TP_STRUCT__entry(args...) args
-
-#undef __field
-#define __field(type, item) \
- ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \
- "offset:%u;\tsize:%u;\n", \
- (unsigned int)offsetof(typeof(field), item), \
- (unsigned int)sizeof(field.item)); \
- if (!ret) \
- return 0;
-
-#undef __array
-#define __array(type, item, len) \
- ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \
- "offset:%u;\tsize:%u;\n", \
- (unsigned int)offsetof(typeof(field), item), \
- (unsigned int)sizeof(field.item)); \
- if (!ret) \
- return 0;
-
-#undef __entry
-#define __entry REC
-
-#undef TP_printk
-#define TP_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args)
-
-#undef TP_fast_assign
-#define TP_fast_assign(args...) args
-
-#undef TRACE_EVENT
-#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
-static int \
-ftrace_format_##call(struct trace_seq *s) \
-{ \
- struct ftrace_raw_##call field; \
- int ret; \
- \
- tstruct; \
- \
- trace_seq_printf(s, "\nprint fmt: " print); \
- \
- return ret; \
-}
-
-#include <trace/trace_event_types.h>
-
-#undef __field
-#define __field(type, item) \
- ret = trace_define_field(event_call, #type, #item, \
- offsetof(typeof(field), item), \
- sizeof(field.item)); \
- if (ret) \
- return ret;
-
-#undef __array
-#define __array(type, item, len) \
- ret = trace_define_field(event_call, #type "[" #len "]", #item, \
- offsetof(typeof(field), item), \
- sizeof(field.item)); \
- if (ret) \
- return ret;
-
-#define __common_field(type, item) \
- ret = trace_define_field(event_call, #type, "common_" #item, \
- offsetof(typeof(field.ent), item), \
- sizeof(field.ent.item)); \
- if (ret) \
- return ret;
-
-#undef TRACE_EVENT
-#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
-int \
-ftrace_define_fields_##call(void) \
-{ \
- struct ftrace_raw_##call field; \
- struct ftrace_event_call *event_call = &event_##call; \
- int ret; \
- \
- __common_field(unsigned char, type); \
- __common_field(unsigned char, flags); \
- __common_field(unsigned char, preempt_count); \
- __common_field(int, pid); \
- __common_field(int, tgid); \
- \
- tstruct; \
- \
- return ret; \
-}
-
-#include <trace/trace_event_types.h>
diff --git a/kernel/trace/trace_events_stage_3.h b/kernel/trace/trace_events_stage_3.h
deleted file mode 100644
index 9d2fa78..0000000
--- a/kernel/trace/trace_events_stage_3.h
+++ /dev/null
@@ -1,281 +0,0 @@
-/*
- * Stage 3 of the trace events.
- *
- * Override the macros in <trace/trace_event_types.h> to include the following:
- *
- * static void ftrace_event_<call>(proto)
- * {
- * event_trace_printk(_RET_IP_, "<call>: " <fmt>);
- * }
- *
- * static int ftrace_reg_event_<call>(void)
- * {
- * int ret;
- *
- * ret = register_trace_<call>(ftrace_event_<call>);
- * if (!ret)
- * pr_info("event trace: Could not activate trace point "
- * "probe to <call>");
- * return ret;
- * }
- *
- * static void ftrace_unreg_event_<call>(void)
- * {
- * unregister_trace_<call>(ftrace_event_<call>);
- * }
- *
- * For those macros defined with TRACE_FORMAT:
- *
- * static struct ftrace_event_call __used
- * __attribute__((__aligned__(4)))
- * __attribute__((section("_ftrace_events"))) event_<call> = {
- * .name = "<call>",
- * .regfunc = ftrace_reg_event_<call>,
- * .unregfunc = ftrace_unreg_event_<call>,
- * }
- *
- *
- * For those macros defined with TRACE_EVENT:
- *
- * static struct ftrace_event_call event_<call>;
- *
- * static void ftrace_raw_event_<call>(proto)
- * {
- * struct ring_buffer_event *event;
- * struct ftrace_raw_<call> *entry; <-- defined in stage 1
- * unsigned long irq_flags;
- * int pc;
- *
- * local_save_flags(irq_flags);
- * pc = preempt_count();
- *
- * event = trace_current_buffer_lock_reserve(event_<call>.id,
- * sizeof(struct ftrace_raw_<call>),
- * irq_flags, pc);
- * if (!event)
- * return;
- * entry = ring_buffer_event_data(event);
- *
- * <assign>; <-- Here we assign the entries by the __field and
- * __array macros.
- *
- * trace_current_buffer_unlock_commit(event, irq_flags, pc);
- * }
- *
- * static int ftrace_raw_reg_event_<call>(void)
- * {
- * int ret;
- *
- * ret = register_trace_<call>(ftrace_raw_event_<call>);
- * if (!ret)
- * pr_info("event trace: Could not activate trace point "
- * "probe to <call>");
- * return ret;
- * }
- *
- * static void ftrace_unreg_event_<call>(void)
- * {
- * unregister_trace_<call>(ftrace_raw_event_<call>);
- * }
- *
- * static struct trace_event ftrace_event_type_<call> = {
- * .trace = ftrace_raw_output_<call>, <-- stage 2
- * };
- *
- * static int ftrace_raw_init_event_<call>(void)
- * {
- * int id;
- *
- * id = register_ftrace_event(&ftrace_event_type_<call>);
- * if (!id)
- * return -ENODEV;
- * event_<call>.id = id;
- * return 0;
- * }
- *
- * static struct ftrace_event_call __used
- * __attribute__((__aligned__(4)))
- * __attribute__((section("_ftrace_events"))) event_<call> = {
- * .name = "<call>",
- * .system = "<system>",
- * .raw_init = ftrace_raw_init_event_<call>,
- * .regfunc = ftrace_reg_event_<call>,
- * .unregfunc = ftrace_unreg_event_<call>,
- * .show_format = ftrace_format_<call>,
- * }
- *
- */
-
-#undef TP_FMT
-#define TP_FMT(fmt, args...) fmt "\n", ##args
-
-#ifdef CONFIG_EVENT_PROFILE
-#define _TRACE_PROFILE(call, proto, args) \
-static void ftrace_profile_##call(proto) \
-{ \
- extern void perf_tpcounter_event(int); \
- perf_tpcounter_event(event_##call.id); \
-} \
- \
-static int ftrace_profile_enable_##call(struct ftrace_event_call *call) \
-{ \
- int ret = 0; \
- \
- if (!atomic_inc_return(&call->profile_count)) \
- ret = register_trace_##call(ftrace_profile_##call); \
- \
- return ret; \
-} \
- \
-static void ftrace_profile_disable_##call(struct ftrace_event_call *call) \
-{ \
- if (atomic_add_negative(-1, &call->profile_count)) \
- unregister_trace_##call(ftrace_profile_##call); \
-}
-
-#define _TRACE_PROFILE_INIT(call) \
- .profile_count = ATOMIC_INIT(-1), \
- .profile_enable = ftrace_profile_enable_##call, \
- .profile_disable = ftrace_profile_disable_##call,
-
-#else
-#define _TRACE_PROFILE(call, proto, args)
-#define _TRACE_PROFILE_INIT(call)
-#endif
-
-#define _TRACE_FORMAT(call, proto, args, fmt) \
-static void ftrace_event_##call(proto) \
-{ \
- event_trace_printk(_RET_IP_, #call ": " fmt); \
-} \
- \
-static int ftrace_reg_event_##call(void) \
-{ \
- int ret; \
- \
- ret = register_trace_##call(ftrace_event_##call); \
- if (ret) \
- pr_info("event trace: Could not activate trace point " \
- "probe to " #call "\n"); \
- return ret; \
-} \
- \
-static void ftrace_unreg_event_##call(void) \
-{ \
- unregister_trace_##call(ftrace_event_##call); \
-} \
- \
-static struct ftrace_event_call event_##call; \
- \
-static int ftrace_init_event_##call(void) \
-{ \
- int id; \
- \
- id = register_ftrace_event(NULL); \
- if (!id) \
- return -ENODEV; \
- event_##call.id = id; \
- return 0; \
-}
-
-#undef TRACE_FORMAT
-#define TRACE_FORMAT(call, proto, args, fmt) \
-_TRACE_FORMAT(call, PARAMS(proto), PARAMS(args), PARAMS(fmt)) \
-_TRACE_PROFILE(call, PARAMS(proto), PARAMS(args)) \
-static struct ftrace_event_call __used \
-__attribute__((__aligned__(4))) \
-__attribute__((section("_ftrace_events"))) event_##call = { \
- .name = #call, \
- .system = __stringify(TRACE_SYSTEM), \
- .raw_init = ftrace_init_event_##call, \
- .regfunc = ftrace_reg_event_##call, \
- .unregfunc = ftrace_unreg_event_##call, \
- _TRACE_PROFILE_INIT(call) \
-}
-
-#undef __entry
-#define __entry entry
-
-#undef TRACE_EVENT
-#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
-_TRACE_PROFILE(call, PARAMS(proto), PARAMS(args)) \
- \
-static struct ftrace_event_call event_##call; \
- \
-static void ftrace_raw_event_##call(proto) \
-{ \
- struct ftrace_event_call *call = &event_##call; \
- struct ring_buffer_event *event; \
- struct ftrace_raw_##call *entry; \
- unsigned long irq_flags; \
- int pc; \
- \
- local_save_flags(irq_flags); \
- pc = preempt_count(); \
- \
- event = trace_current_buffer_lock_reserve(event_##call.id, \
- sizeof(struct ftrace_raw_##call), \
- irq_flags, pc); \
- if (!event) \
- return; \
- entry = ring_buffer_event_data(event); \
- \
- assign; \
- \
- if (call->preds && !filter_match_preds(call, entry)) \
- ring_buffer_event_discard(event); \
- \
- trace_nowake_buffer_unlock_commit(event, irq_flags, pc); \
- \
-} \
- \
-static int ftrace_raw_reg_event_##call(void) \
-{ \
- int ret; \
- \
- ret = register_trace_##call(ftrace_raw_event_##call); \
- if (ret) \
- pr_info("event trace: Could not activate trace point " \
- "probe to " #call "\n"); \
- return ret; \
-} \
- \
-static void ftrace_raw_unreg_event_##call(void) \
-{ \
- unregister_trace_##call(ftrace_raw_event_##call); \
-} \
- \
-static struct trace_event ftrace_event_type_##call = { \
- .trace = ftrace_raw_output_##call, \
-}; \
- \
-static int ftrace_raw_init_event_##call(void) \
-{ \
- int id; \
- \
- id = register_ftrace_event(&ftrace_event_type_##call); \
- if (!id) \
- return -ENODEV; \
- event_##call.id = id; \
- INIT_LIST_HEAD(&event_##call.fields); \
- return 0; \
-} \
- \
-static struct ftrace_event_call __used \
-__attribute__((__aligned__(4))) \
-__attribute__((section("_ftrace_events"))) event_##call = { \
- .name = #call, \
- .system = __stringify(TRACE_SYSTEM), \
- .raw_init = ftrace_raw_init_event_##call, \
- .regfunc = ftrace_raw_reg_event_##call, \
- .unregfunc = ftrace_raw_unreg_event_##call, \
- .show_format = ftrace_format_##call, \
- .define_fields = ftrace_define_fields_##call, \
- _TRACE_PROFILE_INIT(call) \
-}
-
-#include <trace/trace_event_types.h>
-
-#undef _TRACE_PROFILE
-#undef _TRACE_PROFILE_INIT
-
diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c
index 07a22c3..d06cf89 100644
--- a/kernel/trace/trace_export.c
+++ b/kernel/trace/trace_export.c
@@ -19,8 +19,12 @@
#undef TRACE_STRUCT
#define TRACE_STRUCT(args...) args
+extern void __bad_type_size(void);
+
#undef TRACE_FIELD
#define TRACE_FIELD(type, item, assign) \
+ if (sizeof(type) != sizeof(field.item)) \
+ __bad_type_size(); \
ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \
"offset:%u;\tsize:%u;\n", \
(unsigned int)offsetof(typeof(field), item), \
@@ -30,7 +34,7 @@
#undef TRACE_FIELD_SPECIAL
-#define TRACE_FIELD_SPECIAL(type_item, item, cmd) \
+#define TRACE_FIELD_SPECIAL(type_item, item, len, cmd) \
ret = trace_seq_printf(s, "\tfield special:" #type_item ";\t" \
"offset:%u;\tsize:%u;\n", \
(unsigned int)offsetof(typeof(field), item), \
@@ -46,6 +50,9 @@
if (!ret) \
return 0;
+#undef TRACE_FIELD_SIGN
+#define TRACE_FIELD_SIGN(type, item, assign, is_signed) \
+ TRACE_FIELD(type, item, assign)
#undef TP_RAW_FMT
#define TP_RAW_FMT(args...) args
@@ -65,6 +72,22 @@ ftrace_format_##call(struct trace_seq *s) \
return ret; \
}
+#undef TRACE_EVENT_FORMAT_NOFILTER
+#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, \
+ tpfmt) \
+static int \
+ftrace_format_##call(struct trace_seq *s) \
+{ \
+ struct args field; \
+ int ret; \
+ \
+ tstruct; \
+ \
+ trace_seq_printf(s, "\nprint fmt: \"%s\"\n", tpfmt); \
+ \
+ return ret; \
+}
+
#include "trace_event_types.h"
#undef TRACE_ZERO_CHAR
@@ -78,6 +101,10 @@ ftrace_format_##call(struct trace_seq *s) \
#define TRACE_FIELD(type, item, assign)\
entry->item = assign;
+#undef TRACE_FIELD_SIGN
+#define TRACE_FIELD_SIGN(type, item, assign, is_signed) \
+ TRACE_FIELD(type, item, assign)
+
#undef TP_CMD
#define TP_CMD(cmd...) cmd
@@ -85,18 +112,95 @@ ftrace_format_##call(struct trace_seq *s) \
#define TRACE_ENTRY entry
#undef TRACE_FIELD_SPECIAL
-#define TRACE_FIELD_SPECIAL(type_item, item, cmd) \
+#define TRACE_FIELD_SPECIAL(type_item, item, len, cmd) \
cmd;
#undef TRACE_EVENT_FORMAT
#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
+int ftrace_define_fields_##call(void); \
+static int ftrace_raw_init_event_##call(void); \
+ \
+struct ftrace_event_call __used \
+__attribute__((__aligned__(4))) \
+__attribute__((section("_ftrace_events"))) event_##call = { \
+ .name = #call, \
+ .id = proto, \
+ .system = __stringify(TRACE_SYSTEM), \
+ .raw_init = ftrace_raw_init_event_##call, \
+ .show_format = ftrace_format_##call, \
+ .define_fields = ftrace_define_fields_##call, \
+}; \
+static int ftrace_raw_init_event_##call(void) \
+{ \
+ INIT_LIST_HEAD(&event_##call.fields); \
+ init_preds(&event_##call); \
+ return 0; \
+} \
+
+#undef TRACE_EVENT_FORMAT_NOFILTER
+#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, \
+ tpfmt) \
\
-static struct ftrace_event_call __used \
+struct ftrace_event_call __used \
__attribute__((__aligned__(4))) \
__attribute__((section("_ftrace_events"))) event_##call = { \
.name = #call, \
.id = proto, \
.system = __stringify(TRACE_SYSTEM), \
.show_format = ftrace_format_##call, \
+};
+
+#include "trace_event_types.h"
+
+#undef TRACE_FIELD
+#define TRACE_FIELD(type, item, assign) \
+ ret = trace_define_field(event_call, #type, #item, \
+ offsetof(typeof(field), item), \
+ sizeof(field.item), is_signed_type(type)); \
+ if (ret) \
+ return ret;
+
+#undef TRACE_FIELD_SPECIAL
+#define TRACE_FIELD_SPECIAL(type, item, len, cmd) \
+ ret = trace_define_field(event_call, #type "[" #len "]", #item, \
+ offsetof(typeof(field), item), \
+ sizeof(field.item), 0); \
+ if (ret) \
+ return ret;
+
+#undef TRACE_FIELD_SIGN
+#define TRACE_FIELD_SIGN(type, item, assign, is_signed) \
+ ret = trace_define_field(event_call, #type, #item, \
+ offsetof(typeof(field), item), \
+ sizeof(field.item), is_signed); \
+ if (ret) \
+ return ret;
+
+#undef TRACE_FIELD_ZERO_CHAR
+#define TRACE_FIELD_ZERO_CHAR(item)
+
+#undef TRACE_EVENT_FORMAT
+#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
+int \
+ftrace_define_fields_##call(void) \
+{ \
+ struct ftrace_event_call *event_call = &event_##call; \
+ struct args field; \
+ int ret; \
+ \
+ __common_field(unsigned char, type, 0); \
+ __common_field(unsigned char, flags, 0); \
+ __common_field(unsigned char, preempt_count, 0); \
+ __common_field(int, pid, 1); \
+ __common_field(int, tgid, 1); \
+ \
+ tstruct; \
+ \
+ return ret; \
}
+
+#undef TRACE_EVENT_FORMAT_NOFILTER
+#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, \
+ tpfmt)
+
#include "trace_event_types.h"
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index d28687e..10f6ad7 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -78,13 +78,14 @@ ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth)
current->ret_stack[index].ret = ret;
current->ret_stack[index].func = func;
current->ret_stack[index].calltime = calltime;
+ current->ret_stack[index].subtime = 0;
*depth = index;
return 0;
}
/* Retrieve a function return address to the trace stack on thread info.*/
-void
+static void
ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret)
{
int index;
@@ -104,9 +105,6 @@ ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret)
trace->calltime = current->ret_stack[index].calltime;
trace->overrun = atomic_read(¤t->trace_overrun);
trace->depth = index;
- barrier();
- current->curr_ret_stack--;
-
}
/*
@@ -121,6 +119,8 @@ unsigned long ftrace_return_to_handler(void)
ftrace_pop_return_trace(&trace, &ret);
trace.rettime = trace_clock_local();
ftrace_graph_return(&trace);
+ barrier();
+ current->curr_ret_stack--;
if (unlikely(!ret)) {
ftrace_graph_stop();
@@ -426,8 +426,8 @@ print_graph_irq(struct trace_iterator *iter, unsigned long addr,
return TRACE_TYPE_HANDLED;
}
-static enum print_line_t
-print_graph_duration(unsigned long long duration, struct trace_seq *s)
+enum print_line_t
+trace_print_graph_duration(unsigned long long duration, struct trace_seq *s)
{
unsigned long nsecs_rem = do_div(duration, 1000);
/* log10(ULONG_MAX) + '\0' */
@@ -464,12 +464,23 @@ print_graph_duration(unsigned long long duration, struct trace_seq *s)
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
}
+ return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t
+print_graph_duration(unsigned long long duration, struct trace_seq *s)
+{
+ int ret;
+
+ ret = trace_print_graph_duration(duration, s);
+ if (ret != TRACE_TYPE_HANDLED)
+ return ret;
ret = trace_seq_printf(s, "| ");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
- return TRACE_TYPE_HANDLED;
+ return TRACE_TYPE_HANDLED;
}
/* Case of a leaf function on its call entry */
diff --git a/kernel/trace/trace_hw_branches.c b/kernel/trace/trace_hw_branches.c
index 7bfdf4c..ca7d7c4 100644
--- a/kernel/trace/trace_hw_branches.c
+++ b/kernel/trace/trace_hw_branches.c
@@ -1,10 +1,9 @@
/*
- * h/w branch tracer for x86 based on bts
+ * h/w branch tracer for x86 based on BTS
*
* Copyright (C) 2008-2009 Intel Corporation.
* Markus Metzger <markus.t.metzger@...il.com>, 2008-2009
*/
-#include <linux/spinlock.h>
#include <linux/kallsyms.h>
#include <linux/debugfs.h>
#include <linux/ftrace.h>
@@ -15,110 +14,119 @@
#include <asm/ds.h>
-#include "trace.h"
#include "trace_output.h"
+#include "trace.h"
-#define SIZEOF_BTS (1 << 13)
+#define BTS_BUFFER_SIZE (1 << 13)
-/*
- * The tracer lock protects the below per-cpu tracer array.
- * It needs to be held to:
- * - start tracing on all cpus
- * - stop tracing on all cpus
- * - start tracing on a single hotplug cpu
- * - stop tracing on a single hotplug cpu
- * - read the trace from all cpus
- * - read the trace from a single cpu
- */
-static DEFINE_SPINLOCK(bts_tracer_lock);
static DEFINE_PER_CPU(struct bts_tracer *, tracer);
-static DEFINE_PER_CPU(unsigned char[SIZEOF_BTS], buffer);
+static DEFINE_PER_CPU(unsigned char[BTS_BUFFER_SIZE], buffer);
#define this_tracer per_cpu(tracer, smp_processor_id())
-#define this_buffer per_cpu(buffer, smp_processor_id())
-static int __read_mostly trace_hw_branches_enabled;
+static int trace_hw_branches_enabled __read_mostly;
+static int trace_hw_branches_suspended __read_mostly;
static struct trace_array *hw_branch_trace __read_mostly;
-/*
- * Start tracing on the current cpu.
- * The argument is ignored.
- *
- * pre: bts_tracer_lock must be locked.
- */
-static void bts_trace_start_cpu(void *arg)
+static void bts_trace_init_cpu(int cpu)
{
- if (this_tracer)
- ds_release_bts(this_tracer);
-
- this_tracer =
- ds_request_bts(/* task = */ NULL, this_buffer, SIZEOF_BTS,
- /* ovfl = */ NULL, /* th = */ (size_t)-1,
- BTS_KERNEL);
- if (IS_ERR(this_tracer)) {
- this_tracer = NULL;
- return;
- }
+ per_cpu(tracer, cpu) =
+ ds_request_bts_cpu(cpu, per_cpu(buffer, cpu), BTS_BUFFER_SIZE,
+ NULL, (size_t)-1, BTS_KERNEL);
+
+ if (IS_ERR(per_cpu(tracer, cpu)))
+ per_cpu(tracer, cpu) = NULL;
}
-static void bts_trace_start(struct trace_array *tr)
+static int bts_trace_init(struct trace_array *tr)
{
- spin_lock(&bts_tracer_lock);
+ int cpu;
+
+ hw_branch_trace = tr;
+ trace_hw_branches_enabled = 0;
- on_each_cpu(bts_trace_start_cpu, NULL, 1);
- trace_hw_branches_enabled = 1;
+ get_online_cpus();
+ for_each_online_cpu(cpu) {
+ bts_trace_init_cpu(cpu);
- spin_unlock(&bts_tracer_lock);
+ if (likely(per_cpu(tracer, cpu)))
+ trace_hw_branches_enabled = 1;
+ }
+ trace_hw_branches_suspended = 0;
+ put_online_cpus();
+
+ /* If we could not enable tracing on a single cpu, we fail. */
+ return trace_hw_branches_enabled ? 0 : -EOPNOTSUPP;
}
-/*
- * Stop tracing on the current cpu.
- * The argument is ignored.
- *
- * pre: bts_tracer_lock must be locked.
- */
-static void bts_trace_stop_cpu(void *arg)
+static void bts_trace_reset(struct trace_array *tr)
{
- if (this_tracer) {
- ds_release_bts(this_tracer);
- this_tracer = NULL;
+ int cpu;
+
+ get_online_cpus();
+ for_each_online_cpu(cpu) {
+ if (likely(per_cpu(tracer, cpu))) {
+ ds_release_bts(per_cpu(tracer, cpu));
+ per_cpu(tracer, cpu) = NULL;
+ }
}
+ trace_hw_branches_enabled = 0;
+ trace_hw_branches_suspended = 0;
+ put_online_cpus();
}
-static void bts_trace_stop(struct trace_array *tr)
+static void bts_trace_start(struct trace_array *tr)
{
- spin_lock(&bts_tracer_lock);
+ int cpu;
- trace_hw_branches_enabled = 0;
- on_each_cpu(bts_trace_stop_cpu, NULL, 1);
+ get_online_cpus();
+ for_each_online_cpu(cpu)
+ if (likely(per_cpu(tracer, cpu)))
+ ds_resume_bts(per_cpu(tracer, cpu));
+ trace_hw_branches_suspended = 0;
+ put_online_cpus();
+}
- spin_unlock(&bts_tracer_lock);
+static void bts_trace_stop(struct trace_array *tr)
+{
+ int cpu;
+
+ get_online_cpus();
+ for_each_online_cpu(cpu)
+ if (likely(per_cpu(tracer, cpu)))
+ ds_suspend_bts(per_cpu(tracer, cpu));
+ trace_hw_branches_suspended = 1;
+ put_online_cpus();
}
static int __cpuinit bts_hotcpu_handler(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
- unsigned int cpu = (unsigned long)hcpu;
-
- spin_lock(&bts_tracer_lock);
-
- if (!trace_hw_branches_enabled)
- goto out;
+ int cpu = (long)hcpu;
switch (action) {
case CPU_ONLINE:
case CPU_DOWN_FAILED:
- smp_call_function_single(cpu, bts_trace_start_cpu, NULL, 1);
+ /* The notification is sent with interrupts enabled. */
+ if (trace_hw_branches_enabled) {
+ bts_trace_init_cpu(cpu);
+
+ if (trace_hw_branches_suspended &&
+ likely(per_cpu(tracer, cpu)))
+ ds_suspend_bts(per_cpu(tracer, cpu));
+ }
break;
+
case CPU_DOWN_PREPARE:
- smp_call_function_single(cpu, bts_trace_stop_cpu, NULL, 1);
- break;
+ /* The notification is sent with interrupts enabled. */
+ if (likely(per_cpu(tracer, cpu))) {
+ ds_release_bts(per_cpu(tracer, cpu));
+ per_cpu(tracer, cpu) = NULL;
+ }
}
- out:
- spin_unlock(&bts_tracer_lock);
return NOTIFY_DONE;
}
@@ -126,20 +134,6 @@ static struct notifier_block bts_hotcpu_notifier __cpuinitdata = {
.notifier_call = bts_hotcpu_handler
};
-static int bts_trace_init(struct trace_array *tr)
-{
- hw_branch_trace = tr;
-
- bts_trace_start(tr);
-
- return 0;
-}
-
-static void bts_trace_reset(struct trace_array *tr)
-{
- bts_trace_stop(tr);
-}
-
static void bts_trace_print_header(struct seq_file *m)
{
seq_puts(m, "# CPU# TO <- FROM\n");
@@ -147,10 +141,10 @@ static void bts_trace_print_header(struct seq_file *m)
static enum print_line_t bts_trace_print_line(struct trace_iterator *iter)
{
+ unsigned long symflags = TRACE_ITER_SYM_OFFSET;
struct trace_entry *entry = iter->ent;
struct trace_seq *seq = &iter->seq;
struct hw_branch_entry *it;
- unsigned long symflags = TRACE_ITER_SYM_OFFSET;
trace_assign_type(it, entry);
@@ -168,6 +162,7 @@ static enum print_line_t bts_trace_print_line(struct trace_iterator *iter)
void trace_hw_branch(u64 from, u64 to)
{
+ struct ftrace_event_call *call = &event_hw_branch;
struct trace_array *tr = hw_branch_trace;
struct ring_buffer_event *event;
struct hw_branch_entry *entry;
@@ -194,7 +189,8 @@ void trace_hw_branch(u64 from, u64 to)
entry->ent.type = TRACE_HW_BRANCHES;
entry->from = from;
entry->to = to;
- trace_buffer_unlock_commit(tr, event, 0, 0);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ trace_buffer_unlock_commit(tr, event, 0, 0);
out:
atomic_dec(&tr->data[cpu]->disabled);
@@ -224,11 +220,11 @@ static void trace_bts_at(const struct bts_trace *trace, void *at)
/*
* Collect the trace on the current cpu and write it into the ftrace buffer.
*
- * pre: bts_tracer_lock must be locked
+ * pre: tracing must be suspended on the current cpu
*/
static void trace_bts_cpu(void *arg)
{
- struct trace_array *tr = (struct trace_array *) arg;
+ struct trace_array *tr = (struct trace_array *)arg;
const struct bts_trace *trace;
unsigned char *at;
@@ -241,10 +237,9 @@ static void trace_bts_cpu(void *arg)
if (unlikely(!this_tracer))
return;
- ds_suspend_bts(this_tracer);
trace = ds_read_bts(this_tracer);
if (!trace)
- goto out;
+ return;
for (at = trace->ds.top; (void *)at < trace->ds.end;
at += trace->ds.size)
@@ -253,18 +248,27 @@ static void trace_bts_cpu(void *arg)
for (at = trace->ds.begin; (void *)at < trace->ds.top;
at += trace->ds.size)
trace_bts_at(trace, at);
-
-out:
- ds_resume_bts(this_tracer);
}
static void trace_bts_prepare(struct trace_iterator *iter)
{
- spin_lock(&bts_tracer_lock);
+ int cpu;
+ get_online_cpus();
+ for_each_online_cpu(cpu)
+ if (likely(per_cpu(tracer, cpu)))
+ ds_suspend_bts(per_cpu(tracer, cpu));
+ /*
+ * We need to collect the trace on the respective cpu since ftrace
+ * implicitly adds the record for the current cpu.
+ * Once that is more flexible, we could collect the data from any cpu.
+ */
on_each_cpu(trace_bts_cpu, iter->tr, 1);
- spin_unlock(&bts_tracer_lock);
+ for_each_online_cpu(cpu)
+ if (likely(per_cpu(tracer, cpu)))
+ ds_resume_bts(per_cpu(tracer, cpu));
+ put_online_cpus();
}
static void trace_bts_close(struct trace_iterator *iter)
@@ -274,11 +278,11 @@ static void trace_bts_close(struct trace_iterator *iter)
void trace_hw_branch_oops(void)
{
- spin_lock(&bts_tracer_lock);
-
- trace_bts_cpu(hw_branch_trace);
-
- spin_unlock(&bts_tracer_lock);
+ if (this_tracer) {
+ ds_suspend_bts_noirq(this_tracer);
+ trace_bts_cpu(hw_branch_trace);
+ ds_resume_bts_noirq(this_tracer);
+ }
}
struct tracer bts_tracer __read_mostly =
@@ -291,7 +295,10 @@ struct tracer bts_tracer __read_mostly =
.start = bts_trace_start,
.stop = bts_trace_stop,
.open = trace_bts_prepare,
- .close = trace_bts_close
+ .close = trace_bts_close,
+#ifdef CONFIG_FTRACE_SELFTEST
+ .selftest = trace_selftest_startup_hw_branches,
+#endif /* CONFIG_FTRACE_SELFTEST */
};
__init static int init_bts_trace(void)
diff --git a/kernel/trace/trace_mmiotrace.c b/kernel/trace/trace_mmiotrace.c
index 8e37fcd..d53b45e 100644
--- a/kernel/trace/trace_mmiotrace.c
+++ b/kernel/trace/trace_mmiotrace.c
@@ -9,6 +9,8 @@
#include <linux/kernel.h>
#include <linux/mmiotrace.h>
#include <linux/pci.h>
+#include <linux/time.h>
+
#include <asm/atomic.h>
#include "trace.h"
@@ -174,7 +176,7 @@ static enum print_line_t mmio_print_rw(struct trace_iterator *iter)
struct mmiotrace_rw *rw;
struct trace_seq *s = &iter->seq;
unsigned long long t = ns2usecs(iter->ts);
- unsigned long usec_rem = do_div(t, 1000000ULL);
+ unsigned long usec_rem = do_div(t, USEC_PER_SEC);
unsigned secs = (unsigned long)t;
int ret = 1;
@@ -221,7 +223,7 @@ static enum print_line_t mmio_print_map(struct trace_iterator *iter)
struct mmiotrace_map *m;
struct trace_seq *s = &iter->seq;
unsigned long long t = ns2usecs(iter->ts);
- unsigned long usec_rem = do_div(t, 1000000ULL);
+ unsigned long usec_rem = do_div(t, USEC_PER_SEC);
unsigned secs = (unsigned long)t;
int ret;
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 64b54a5..7938f3a 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -14,11 +14,25 @@
/* must be a power of 2 */
#define EVENT_HASHSIZE 128
-static DEFINE_MUTEX(trace_event_mutex);
+DECLARE_RWSEM(trace_event_mutex);
+
+DEFINE_PER_CPU(struct trace_seq, ftrace_event_seq);
+EXPORT_PER_CPU_SYMBOL(ftrace_event_seq);
+
static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
static int next_event_type = __TRACE_LAST_TYPE + 1;
+void trace_print_seq(struct seq_file *m, struct trace_seq *s)
+{
+ int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
+
+ s->buffer[len] = 0;
+ seq_puts(m, s->buffer);
+
+ trace_seq_init(s);
+}
+
enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
{
struct trace_seq *s = &iter->seq;
@@ -84,6 +98,39 @@ trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
return len;
}
+EXPORT_SYMBOL_GPL(trace_seq_printf);
+
+/**
+ * trace_seq_vprintf - sequence printing of trace information
+ * @s: trace sequence descriptor
+ * @fmt: printf format string
+ *
+ * The tracer may use either sequence operations or its own
+ * copy to user routines. To simplify formating of a trace
+ * trace_seq_printf is used to store strings into a special
+ * buffer (@s). Then the output may be either used by
+ * the sequencer or pulled into another buffer.
+ */
+int
+trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
+{
+ int len = (PAGE_SIZE - 1) - s->len;
+ int ret;
+
+ if (!len)
+ return 0;
+
+ ret = vsnprintf(s->buffer + s->len, len, fmt, args);
+
+ /* If we can't write it all, don't bother writing anything */
+ if (ret >= len)
+ return 0;
+
+ s->len += ret;
+
+ return len;
+}
+EXPORT_SYMBOL_GPL(trace_seq_vprintf);
int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
{
@@ -201,6 +248,67 @@ int trace_seq_path(struct trace_seq *s, struct path *path)
return 0;
}
+const char *
+ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
+ unsigned long flags,
+ const struct trace_print_flags *flag_array)
+{
+ unsigned long mask;
+ const char *str;
+ const char *ret = p->buffer + p->len;
+ int i;
+
+ for (i = 0; flag_array[i].name && flags; i++) {
+
+ mask = flag_array[i].mask;
+ if ((flags & mask) != mask)
+ continue;
+
+ str = flag_array[i].name;
+ flags &= ~mask;
+ if (p->len && delim)
+ trace_seq_puts(p, delim);
+ trace_seq_puts(p, str);
+ }
+
+ /* check for left over flags */
+ if (flags) {
+ if (p->len && delim)
+ trace_seq_puts(p, delim);
+ trace_seq_printf(p, "0x%lx", flags);
+ }
+
+ trace_seq_putc(p, 0);
+
+ return ret;
+}
+EXPORT_SYMBOL(ftrace_print_flags_seq);
+
+const char *
+ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
+ const struct trace_print_flags *symbol_array)
+{
+ int i;
+ const char *ret = p->buffer + p->len;
+
+ for (i = 0; symbol_array[i].name; i++) {
+
+ if (val != symbol_array[i].mask)
+ continue;
+
+ trace_seq_puts(p, symbol_array[i].name);
+ break;
+ }
+
+ if (!p->len)
+ trace_seq_printf(p, "0x%lx", val);
+
+ trace_seq_putc(p, 0);
+
+ return ret;
+}
+EXPORT_SYMBOL(ftrace_print_symbols_seq);
+
#ifdef CONFIG_KRETPROBES
static inline const char *kretprobed(const char *name)
{
@@ -311,17 +419,20 @@ seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
if (ip == ULONG_MAX || !ret)
break;
- if (i && ret)
- ret = trace_seq_puts(s, " <- ");
+ if (ret)
+ ret = trace_seq_puts(s, " => ");
if (!ip) {
if (ret)
ret = trace_seq_puts(s, "??");
+ if (ret)
+ ret = trace_seq_puts(s, "\n");
continue;
}
if (!ret)
break;
if (ret)
ret = seq_print_user_ip(s, mm, ip, sym_flags);
+ ret = trace_seq_puts(s, "\n");
}
if (mm)
@@ -455,6 +566,7 @@ static int task_state_char(unsigned long state)
* @type: the type of event to look for
*
* Returns an event of type @type otherwise NULL
+ * Called with trace_event_read_lock() held.
*/
struct trace_event *ftrace_find_event(int type)
{
@@ -464,7 +576,7 @@ struct trace_event *ftrace_find_event(int type)
key = type & (EVENT_HASHSIZE - 1);
- hlist_for_each_entry_rcu(event, n, &event_hash[key], node) {
+ hlist_for_each_entry(event, n, &event_hash[key], node) {
if (event->type == type)
return event;
}
@@ -472,6 +584,46 @@ struct trace_event *ftrace_find_event(int type)
return NULL;
}
+static LIST_HEAD(ftrace_event_list);
+
+static int trace_search_list(struct list_head **list)
+{
+ struct trace_event *e;
+ int last = __TRACE_LAST_TYPE;
+
+ if (list_empty(&ftrace_event_list)) {
+ *list = &ftrace_event_list;
+ return last + 1;
+ }
+
+ /*
+ * We used up all possible max events,
+ * lets see if somebody freed one.
+ */
+ list_for_each_entry(e, &ftrace_event_list, list) {
+ if (e->type != last + 1)
+ break;
+ last++;
+ }
+
+ /* Did we used up all 65 thousand events??? */
+ if ((last + 1) > FTRACE_MAX_EVENT)
+ return 0;
+
+ *list = &e->list;
+ return last + 1;
+}
+
+void trace_event_read_lock(void)
+{
+ down_read(&trace_event_mutex);
+}
+
+void trace_event_read_unlock(void)
+{
+ up_read(&trace_event_mutex);
+}
+
/**
* register_ftrace_event - register output for an event type
* @event: the event type to register
@@ -492,22 +644,42 @@ int register_ftrace_event(struct trace_event *event)
unsigned key;
int ret = 0;
- mutex_lock(&trace_event_mutex);
+ down_write(&trace_event_mutex);
- if (!event) {
- ret = next_event_type++;
+ if (WARN_ON(!event))
goto out;
- }
- if (!event->type)
- event->type = next_event_type++;
- else if (event->type > __TRACE_LAST_TYPE) {
+ INIT_LIST_HEAD(&event->list);
+
+ if (!event->type) {
+ struct list_head *list = NULL;
+
+ if (next_event_type > FTRACE_MAX_EVENT) {
+
+ event->type = trace_search_list(&list);
+ if (!event->type)
+ goto out;
+
+ } else {
+
+ event->type = next_event_type++;
+ list = &ftrace_event_list;
+ }
+
+ if (WARN_ON(ftrace_find_event(event->type)))
+ goto out;
+
+ list_add_tail(&event->list, list);
+
+ } else if (event->type > __TRACE_LAST_TYPE) {
printk(KERN_WARNING "Need to add type to trace.h\n");
WARN_ON(1);
- }
-
- if (ftrace_find_event(event->type))
goto out;
+ } else {
+ /* Is this event already used */
+ if (ftrace_find_event(event->type))
+ goto out;
+ }
if (event->trace == NULL)
event->trace = trace_nop_print;
@@ -520,14 +692,25 @@ int register_ftrace_event(struct trace_event *event)
key = event->type & (EVENT_HASHSIZE - 1);
- hlist_add_head_rcu(&event->node, &event_hash[key]);
+ hlist_add_head(&event->node, &event_hash[key]);
ret = event->type;
out:
- mutex_unlock(&trace_event_mutex);
+ up_write(&trace_event_mutex);
return ret;
}
+EXPORT_SYMBOL_GPL(register_ftrace_event);
+
+/*
+ * Used by module code with the trace_event_mutex held for write.
+ */
+int __unregister_ftrace_event(struct trace_event *event)
+{
+ hlist_del(&event->node);
+ list_del(&event->list);
+ return 0;
+}
/**
* unregister_ftrace_event - remove a no longer used event
@@ -535,12 +718,13 @@ int register_ftrace_event(struct trace_event *event)
*/
int unregister_ftrace_event(struct trace_event *event)
{
- mutex_lock(&trace_event_mutex);
- hlist_del(&event->node);
- mutex_unlock(&trace_event_mutex);
+ down_write(&trace_event_mutex);
+ __unregister_ftrace_event(event);
+ up_write(&trace_event_mutex);
return 0;
}
+EXPORT_SYMBOL_GPL(unregister_ftrace_event);
/*
* Standard events
@@ -833,14 +1017,16 @@ static enum print_line_t trace_stack_print(struct trace_iterator *iter,
trace_assign_type(field, iter->ent);
+ if (!trace_seq_puts(s, "<stack trace>\n"))
+ goto partial;
for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
- if (i) {
- if (!trace_seq_puts(s, " <= "))
- goto partial;
+ if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
+ break;
+ if (!trace_seq_puts(s, " => "))
+ goto partial;
- if (!seq_print_ip_sym(s, field->caller[i], flags))
- goto partial;
- }
+ if (!seq_print_ip_sym(s, field->caller[i], flags))
+ goto partial;
if (!trace_seq_puts(s, "\n"))
goto partial;
}
@@ -868,10 +1054,10 @@ static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
trace_assign_type(field, iter->ent);
- if (!seq_print_userip_objs(field, s, flags))
+ if (!trace_seq_puts(s, "<user stack trace>\n"))
goto partial;
- if (!trace_seq_putc(s, '\n'))
+ if (!seq_print_userip_objs(field, s, flags))
goto partial;
return TRACE_TYPE_HANDLED;
diff --git a/kernel/trace/trace_output.h b/kernel/trace/trace_output.h
index e0bde39..d38bec4 100644
--- a/kernel/trace/trace_output.h
+++ b/kernel/trace/trace_output.h
@@ -1,41 +1,17 @@
#ifndef __TRACE_EVENTS_H
#define __TRACE_EVENTS_H
+#include <linux/trace_seq.h>
#include "trace.h"
-typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
- int flags);
-
-struct trace_event {
- struct hlist_node node;
- int type;
- trace_print_func trace;
- trace_print_func raw;
- trace_print_func hex;
- trace_print_func binary;
-};
-
extern enum print_line_t
trace_print_bprintk_msg_only(struct trace_iterator *iter);
extern enum print_line_t
trace_print_printk_msg_only(struct trace_iterator *iter);
-extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
- __attribute__ ((format (printf, 2, 3)));
-extern int
-trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary);
extern int
seq_print_ip_sym(struct trace_seq *s, unsigned long ip,
unsigned long sym_flags);
-extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
- size_t cnt);
-extern int trace_seq_puts(struct trace_seq *s, const char *str);
-extern int trace_seq_putc(struct trace_seq *s, unsigned char c);
-extern int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len);
-extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
- size_t len);
-extern void *trace_seq_reserve(struct trace_seq *s, size_t len);
-extern int trace_seq_path(struct trace_seq *s, struct path *path);
extern int seq_print_userip_objs(const struct userstack_entry *entry,
struct trace_seq *s, unsigned long sym_flags);
extern int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
@@ -44,13 +20,17 @@ extern int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
extern int trace_print_context(struct trace_iterator *iter);
extern int trace_print_lat_context(struct trace_iterator *iter);
+extern void trace_event_read_lock(void);
+extern void trace_event_read_unlock(void);
extern struct trace_event *ftrace_find_event(int type);
-extern int register_ftrace_event(struct trace_event *event);
-extern int unregister_ftrace_event(struct trace_event *event);
extern enum print_line_t trace_nop_print(struct trace_iterator *iter,
int flags);
+/* used by module unregistering */
+extern int __unregister_ftrace_event(struct trace_event *event);
+extern struct rw_semaphore trace_event_mutex;
+
#define MAX_MEMHEX_BYTES 8
#define HEX_CHARS (MAX_MEMHEX_BYTES*2 + 1)
diff --git a/kernel/trace/trace_power.c b/kernel/trace/trace_power.c
index 1184397..8a30d98 100644
--- a/kernel/trace/trace_power.c
+++ b/kernel/trace/trace_power.c
@@ -36,6 +36,7 @@ static void probe_power_start(struct power_trace *it, unsigned int type,
static void probe_power_end(struct power_trace *it)
{
+ struct ftrace_event_call *call = &event_power;
struct ring_buffer_event *event;
struct trace_power *entry;
struct trace_array_cpu *data;
@@ -54,7 +55,8 @@ static void probe_power_end(struct power_trace *it)
goto out;
entry = ring_buffer_event_data(event);
entry->state_data = *it;
- trace_buffer_unlock_commit(tr, event, 0, 0);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ trace_buffer_unlock_commit(tr, event, 0, 0);
out:
preempt_enable();
}
@@ -62,6 +64,7 @@ static void probe_power_end(struct power_trace *it)
static void probe_power_mark(struct power_trace *it, unsigned int type,
unsigned int level)
{
+ struct ftrace_event_call *call = &event_power;
struct ring_buffer_event *event;
struct trace_power *entry;
struct trace_array_cpu *data;
@@ -84,7 +87,8 @@ static void probe_power_mark(struct power_trace *it, unsigned int type,
goto out;
entry = ring_buffer_event_data(event);
entry->state_data = *it;
- trace_buffer_unlock_commit(tr, event, 0, 0);
+ if (!filter_check_discard(call, entry, tr->buffer, event))
+ trace_buffer_unlock_commit(tr, event, 0, 0);
out:
preempt_enable();
}
diff --git a/kernel/trace/trace_printk.c b/kernel/trace/trace_printk.c
index eb81556..9bece96 100644
--- a/kernel/trace/trace_printk.c
+++ b/kernel/trace/trace_printk.c
@@ -245,17 +245,13 @@ static const struct file_operations ftrace_formats_fops = {
static __init int init_trace_printk_function_export(void)
{
struct dentry *d_tracer;
- struct dentry *entry;
d_tracer = tracing_init_dentry();
if (!d_tracer)
return 0;
- entry = debugfs_create_file("printk_formats", 0444, d_tracer,
+ trace_create_file("printk_formats", 0444, d_tracer,
NULL, &ftrace_formats_fops);
- if (!entry)
- pr_warning("Could not create debugfs "
- "'printk_formats' entry\n");
return 0;
}
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index 9117cea..a98106d 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -10,7 +10,7 @@
#include <linux/kallsyms.h>
#include <linux/uaccess.h>
#include <linux/ftrace.h>
-#include <trace/sched.h>
+#include <trace/events/sched.h>
#include "trace.h"
@@ -29,13 +29,13 @@ probe_sched_switch(struct rq *__rq, struct task_struct *prev,
int cpu;
int pc;
- if (!sched_ref || sched_stopped)
+ if (unlikely(!sched_ref))
return;
tracing_record_cmdline(prev);
tracing_record_cmdline(next);
- if (!tracer_enabled)
+ if (!tracer_enabled || sched_stopped)
return;
pc = preempt_count();
@@ -56,15 +56,15 @@ probe_sched_wakeup(struct rq *__rq, struct task_struct *wakee, int success)
unsigned long flags;
int cpu, pc;
- if (!likely(tracer_enabled))
+ if (unlikely(!sched_ref))
return;
- pc = preempt_count();
tracing_record_cmdline(current);
- if (sched_stopped)
+ if (!tracer_enabled || sched_stopped)
return;
+ pc = preempt_count();
local_irq_save(flags);
cpu = raw_smp_processor_id();
data = ctx_trace->data[cpu];
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index 5bc00e8..eacb272 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -15,7 +15,7 @@
#include <linux/kallsyms.h>
#include <linux/uaccess.h>
#include <linux/ftrace.h>
-#include <trace/sched.h>
+#include <trace/events/sched.h>
#include "trace.h"
@@ -138,9 +138,6 @@ probe_wakeup_sched_switch(struct rq *rq, struct task_struct *prev,
pc = preempt_count();
- /* The task we are waiting for is waking up */
- data = wakeup_trace->data[wakeup_cpu];
-
/* disable local data, not wakeup_cpu data */
cpu = raw_smp_processor_id();
disabled = atomic_inc_return(&wakeup_trace->data[cpu]->disabled);
@@ -154,6 +151,9 @@ probe_wakeup_sched_switch(struct rq *rq, struct task_struct *prev,
if (unlikely(!tracer_enabled || next != wakeup_task))
goto out_unlock;
+ /* The task we are waiting for is waking up */
+ data = wakeup_trace->data[wakeup_cpu];
+
trace_function(wakeup_trace, CALLER_ADDR0, CALLER_ADDR1, flags, pc);
tracing_sched_switch_trace(wakeup_trace, prev, next, flags, pc);
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 08f4eb2..00dd648 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -16,6 +16,7 @@ static inline int trace_valid_entry(struct trace_entry *entry)
case TRACE_BRANCH:
case TRACE_GRAPH_ENT:
case TRACE_GRAPH_RET:
+ case TRACE_HW_BRANCHES:
return 1;
}
return 0;
@@ -188,6 +189,7 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
#else
# define trace_selftest_startup_dynamic_tracing(trace, tr, func) ({ 0; })
#endif /* CONFIG_DYNAMIC_FTRACE */
+
/*
* Simple verification test of ftrace function tracer.
* Enable ftrace, sleep 1/10 second, and then read the trace
@@ -749,3 +751,59 @@ trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr)
return ret;
}
#endif /* CONFIG_BRANCH_TRACER */
+
+#ifdef CONFIG_HW_BRANCH_TRACER
+int
+trace_selftest_startup_hw_branches(struct tracer *trace,
+ struct trace_array *tr)
+{
+ struct trace_iterator *iter;
+ struct tracer tracer;
+ unsigned long count;
+ int ret;
+
+ if (!trace->open) {
+ printk(KERN_CONT "missing open function...");
+ return -1;
+ }
+
+ ret = tracer_init(trace, tr);
+ if (ret) {
+ warn_failed_init_tracer(trace, ret);
+ return ret;
+ }
+
+ /*
+ * The hw-branch tracer needs to collect the trace from the various
+ * cpu trace buffers - before tracing is stopped.
+ */
+ iter = kzalloc(sizeof(*iter), GFP_KERNEL);
+ if (!iter)
+ return -ENOMEM;
+
+ memcpy(&tracer, trace, sizeof(tracer));
+
+ iter->trace = &tracer;
+ iter->tr = tr;
+ iter->pos = -1;
+ mutex_init(&iter->mutex);
+
+ trace->open(iter);
+
+ mutex_destroy(&iter->mutex);
+ kfree(iter);
+
+ tracing_stop();
+
+ ret = trace_test_buffer(tr, &count);
+ trace->reset(tr);
+ tracing_start();
+
+ if (!ret && !count) {
+ printk(KERN_CONT "no entries found..");
+ ret = -1;
+ }
+
+ return ret;
+}
+#endif /* CONFIG_HW_BRANCH_TRACER */
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index c750f65..2d7aebd 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -265,7 +265,7 @@ static int t_show(struct seq_file *m, void *v)
seq_printf(m, " Depth Size Location"
" (%d entries)\n"
" ----- ---- --------\n",
- max_stack_trace.nr_entries);
+ max_stack_trace.nr_entries - 1);
if (!stack_tracer_enabled && !max_stack_size)
print_disabled(m);
@@ -352,19 +352,14 @@ __setup("stacktrace", enable_stacktrace);
static __init int stack_trace_init(void)
{
struct dentry *d_tracer;
- struct dentry *entry;
d_tracer = tracing_init_dentry();
- entry = debugfs_create_file("stack_max_size", 0644, d_tracer,
- &max_stack_size, &stack_max_size_fops);
- if (!entry)
- pr_warning("Could not create debugfs 'stack_max_size' entry\n");
+ trace_create_file("stack_max_size", 0644, d_tracer,
+ &max_stack_size, &stack_max_size_fops);
- entry = debugfs_create_file("stack_trace", 0444, d_tracer,
- NULL, &stack_trace_fops);
- if (!entry)
- pr_warning("Could not create debugfs 'stack_trace' entry\n");
+ trace_create_file("stack_trace", 0444, d_tracer,
+ NULL, &stack_trace_fops);
if (stack_tracer_enabled)
register_ftrace_function(&trace_ops);
diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
index acdebd7..c006437 100644
--- a/kernel/trace/trace_stat.c
+++ b/kernel/trace/trace_stat.c
@@ -1,7 +1,7 @@
/*
* Infrastructure for statistic tracing (histogram output).
*
- * Copyright (C) 2008 Frederic Weisbecker <fweisbec@...il.com>
+ * Copyright (C) 2008-2009 Frederic Weisbecker <fweisbec@...il.com>
*
* Based on the code from trace_branch.c which is
* Copyright (C) 2008 Steven Rostedt <srostedt@...hat.com>
@@ -10,22 +10,27 @@
#include <linux/list.h>
+#include <linux/rbtree.h>
#include <linux/debugfs.h>
#include "trace_stat.h"
#include "trace.h"
-/* List of stat entries from a tracer */
-struct trace_stat_list {
- struct list_head list;
+/*
+ * List of stat red-black nodes from a tracer
+ * We use a such tree to sort quickly the stat
+ * entries from the tracer.
+ */
+struct stat_node {
+ struct rb_node node;
void *stat;
};
/* A stat session is the stats output in one file */
-struct tracer_stat_session {
+struct stat_session {
struct list_head session_list;
struct tracer_stat *ts;
- struct list_head stat_list;
+ struct rb_root stat_root;
struct mutex stat_mutex;
struct dentry *file;
};
@@ -37,18 +42,48 @@ static DEFINE_MUTEX(all_stat_sessions_mutex);
/* The root directory for all stat files */
static struct dentry *stat_dir;
+/*
+ * Iterate through the rbtree using a post order traversal path
+ * to release the next node.
+ * It won't necessary release one at each iteration
+ * but it will at least advance closer to the next one
+ * to be released.
+ */
+static struct rb_node *release_next(struct rb_node *node)
+{
+ struct stat_node *snode;
+ struct rb_node *parent = rb_parent(node);
+
+ if (node->rb_left)
+ return node->rb_left;
+ else if (node->rb_right)
+ return node->rb_right;
+ else {
+ if (!parent)
+ ;
+ else if (parent->rb_left == node)
+ parent->rb_left = NULL;
+ else
+ parent->rb_right = NULL;
+
+ snode = container_of(node, struct stat_node, node);
+ kfree(snode);
+
+ return parent;
+ }
+}
-static void reset_stat_session(struct tracer_stat_session *session)
+static void reset_stat_session(struct stat_session *session)
{
- struct trace_stat_list *node, *next;
+ struct rb_node *node = session->stat_root.rb_node;
- list_for_each_entry_safe(node, next, &session->stat_list, list)
- kfree(node);
+ while (node)
+ node = release_next(node);
- INIT_LIST_HEAD(&session->stat_list);
+ session->stat_root = RB_ROOT;
}
-static void destroy_session(struct tracer_stat_session *session)
+static void destroy_session(struct stat_session *session)
{
debugfs_remove(session->file);
reset_stat_session(session);
@@ -56,25 +91,60 @@ static void destroy_session(struct tracer_stat_session *session)
kfree(session);
}
+typedef int (*cmp_stat_t)(void *, void *);
+
+static int insert_stat(struct rb_root *root, void *stat, cmp_stat_t cmp)
+{
+ struct rb_node **new = &(root->rb_node), *parent = NULL;
+ struct stat_node *data;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+ data->stat = stat;
+
+ /*
+ * Figure out where to put new node
+ * This is a descendent sorting
+ */
+ while (*new) {
+ struct stat_node *this;
+ int result;
+
+ this = container_of(*new, struct stat_node, node);
+ result = cmp(data->stat, this->stat);
+
+ parent = *new;
+ if (result >= 0)
+ new = &((*new)->rb_left);
+ else
+ new = &((*new)->rb_right);
+ }
+
+ rb_link_node(&data->node, parent, new);
+ rb_insert_color(&data->node, root);
+ return 0;
+}
+
/*
* For tracers that don't provide a stat_cmp callback.
- * This one will force an immediate insertion on tail of
- * the list.
+ * This one will force an insertion as right-most node
+ * in the rbtree.
*/
static int dummy_cmp(void *p1, void *p2)
{
- return 1;
+ return -1;
}
/*
- * Initialize the stat list at each trace_stat file opening.
+ * Initialize the stat rbtree at each trace_stat file opening.
* All of these copies and sorting are required on all opening
* since the stats could have changed between two file sessions.
*/
-static int stat_seq_init(struct tracer_stat_session *session)
+static int stat_seq_init(struct stat_session *session)
{
- struct trace_stat_list *iter_entry, *new_entry;
struct tracer_stat *ts = session->ts;
+ struct rb_root *root = &session->stat_root;
void *stat;
int ret = 0;
int i;
@@ -85,29 +155,16 @@ static int stat_seq_init(struct tracer_stat_session *session)
if (!ts->stat_cmp)
ts->stat_cmp = dummy_cmp;
- stat = ts->stat_start();
+ stat = ts->stat_start(ts);
if (!stat)
goto exit;
- /*
- * The first entry. Actually this is the second, but the first
- * one (the stat_list head) is pointless.
- */
- new_entry = kmalloc(sizeof(struct trace_stat_list), GFP_KERNEL);
- if (!new_entry) {
- ret = -ENOMEM;
+ ret = insert_stat(root, stat, ts->stat_cmp);
+ if (ret)
goto exit;
- }
-
- INIT_LIST_HEAD(&new_entry->list);
-
- list_add(&new_entry->list, &session->stat_list);
-
- new_entry->stat = stat;
/*
- * Iterate over the tracer stat entries and store them in a sorted
- * list.
+ * Iterate over the tracer stat entries and store them in an rbtree.
*/
for (i = 1; ; i++) {
stat = ts->stat_next(stat, i);
@@ -116,36 +173,16 @@ static int stat_seq_init(struct tracer_stat_session *session)
if (!stat)
break;
- new_entry = kmalloc(sizeof(struct trace_stat_list), GFP_KERNEL);
- if (!new_entry) {
- ret = -ENOMEM;
- goto exit_free_list;
- }
-
- INIT_LIST_HEAD(&new_entry->list);
- new_entry->stat = stat;
-
- list_for_each_entry_reverse(iter_entry, &session->stat_list,
- list) {
-
- /* Insertion with a descendent sorting */
- if (ts->stat_cmp(iter_entry->stat,
- new_entry->stat) >= 0) {
-
- list_add(&new_entry->list, &iter_entry->list);
- break;
- }
- }
-
- /* The current larger value */
- if (list_empty(&new_entry->list))
- list_add(&new_entry->list, &session->stat_list);
+ ret = insert_stat(root, stat, ts->stat_cmp);
+ if (ret)
+ goto exit_free_rbtree;
}
+
exit:
mutex_unlock(&session->stat_mutex);
return ret;
-exit_free_list:
+exit_free_rbtree:
reset_stat_session(session);
mutex_unlock(&session->stat_mutex);
return ret;
@@ -154,38 +191,51 @@ exit_free_list:
static void *stat_seq_start(struct seq_file *s, loff_t *pos)
{
- struct tracer_stat_session *session = s->private;
+ struct stat_session *session = s->private;
+ struct rb_node *node;
+ int i;
- /* Prevent from tracer switch or stat_list modification */
+ /* Prevent from tracer switch or rbtree modification */
mutex_lock(&session->stat_mutex);
/* If we are in the beginning of the file, print the headers */
- if (!*pos && session->ts->stat_headers)
+ if (!*pos && session->ts->stat_headers) {
+ (*pos)++;
return SEQ_START_TOKEN;
+ }
- return seq_list_start(&session->stat_list, *pos);
+ node = rb_first(&session->stat_root);
+ for (i = 0; node && i < *pos; i++)
+ node = rb_next(node);
+
+ (*pos)++;
+
+ return node;
}
static void *stat_seq_next(struct seq_file *s, void *p, loff_t *pos)
{
- struct tracer_stat_session *session = s->private;
+ struct stat_session *session = s->private;
+ struct rb_node *node = p;
+
+ (*pos)++;
if (p == SEQ_START_TOKEN)
- return seq_list_start(&session->stat_list, *pos);
+ return rb_first(&session->stat_root);
- return seq_list_next(p, &session->stat_list, pos);
+ return rb_next(node);
}
static void stat_seq_stop(struct seq_file *s, void *p)
{
- struct tracer_stat_session *session = s->private;
+ struct stat_session *session = s->private;
mutex_unlock(&session->stat_mutex);
}
static int stat_seq_show(struct seq_file *s, void *v)
{
- struct tracer_stat_session *session = s->private;
- struct trace_stat_list *l = list_entry(v, struct trace_stat_list, list);
+ struct stat_session *session = s->private;
+ struct stat_node *l = container_of(v, struct stat_node, node);
if (v == SEQ_START_TOKEN)
return session->ts->stat_headers(s);
@@ -205,7 +255,7 @@ static int tracing_stat_open(struct inode *inode, struct file *file)
{
int ret;
- struct tracer_stat_session *session = inode->i_private;
+ struct stat_session *session = inode->i_private;
ret = seq_open(file, &trace_stat_seq_ops);
if (!ret) {
@@ -218,11 +268,11 @@ static int tracing_stat_open(struct inode *inode, struct file *file)
}
/*
- * Avoid consuming memory with our now useless list.
+ * Avoid consuming memory with our now useless rbtree.
*/
static int tracing_stat_release(struct inode *i, struct file *f)
{
- struct tracer_stat_session *session = i->i_private;
+ struct stat_session *session = i->i_private;
mutex_lock(&session->stat_mutex);
reset_stat_session(session);
@@ -251,7 +301,7 @@ static int tracing_stat_init(void)
return 0;
}
-static int init_stat_file(struct tracer_stat_session *session)
+static int init_stat_file(struct stat_session *session)
{
if (!stat_dir && tracing_stat_init())
return -ENODEV;
@@ -266,7 +316,7 @@ static int init_stat_file(struct tracer_stat_session *session)
int register_stat_tracer(struct tracer_stat *trace)
{
- struct tracer_stat_session *session, *node, *tmp;
+ struct stat_session *session, *node;
int ret;
if (!trace)
@@ -277,7 +327,7 @@ int register_stat_tracer(struct tracer_stat *trace)
/* Already registered? */
mutex_lock(&all_stat_sessions_mutex);
- list_for_each_entry_safe(node, tmp, &all_stat_sessions, session_list) {
+ list_for_each_entry(node, &all_stat_sessions, session_list) {
if (node->ts == trace) {
mutex_unlock(&all_stat_sessions_mutex);
return -EINVAL;
@@ -286,15 +336,13 @@ int register_stat_tracer(struct tracer_stat *trace)
mutex_unlock(&all_stat_sessions_mutex);
/* Init the session */
- session = kmalloc(sizeof(struct tracer_stat_session), GFP_KERNEL);
+ session = kzalloc(sizeof(*session), GFP_KERNEL);
if (!session)
return -ENOMEM;
session->ts = trace;
INIT_LIST_HEAD(&session->session_list);
- INIT_LIST_HEAD(&session->stat_list);
mutex_init(&session->stat_mutex);
- session->file = NULL;
ret = init_stat_file(session);
if (ret) {
@@ -312,7 +360,7 @@ int register_stat_tracer(struct tracer_stat *trace)
void unregister_stat_tracer(struct tracer_stat *trace)
{
- struct tracer_stat_session *node, *tmp;
+ struct stat_session *node, *tmp;
mutex_lock(&all_stat_sessions_mutex);
list_for_each_entry_safe(node, tmp, &all_stat_sessions, session_list) {
diff --git a/kernel/trace/trace_stat.h b/kernel/trace/trace_stat.h
index 202274c..f3546a2 100644
--- a/kernel/trace/trace_stat.h
+++ b/kernel/trace/trace_stat.h
@@ -12,7 +12,7 @@ struct tracer_stat {
/* The name of your stat file */
const char *name;
/* Iteration over statistic entries */
- void *(*stat_start)(void);
+ void *(*stat_start)(struct tracer_stat *trace);
void *(*stat_next)(void *prev, int idx);
/* Compare two entries for stats sorting */
int (*stat_cmp)(void *p1, void *p2);
diff --git a/kernel/trace/trace_sysprof.c b/kernel/trace/trace_sysprof.c
index 91fd19c..e04b76c 100644
--- a/kernel/trace/trace_sysprof.c
+++ b/kernel/trace/trace_sysprof.c
@@ -321,11 +321,7 @@ static const struct file_operations sysprof_sample_fops = {
void init_tracer_sysprof_debugfs(struct dentry *d_tracer)
{
- struct dentry *entry;
- entry = debugfs_create_file("sysprof_sample_period", 0644,
+ trace_create_file("sysprof_sample_period", 0644,
d_tracer, NULL, &sysprof_sample_fops);
- if (entry)
- return;
- pr_warning("Could not create debugfs 'sysprof_sample_period' entry\n");
}
diff --git a/kernel/trace/trace_workqueue.c b/kernel/trace/trace_workqueue.c
index 797201e..97fcea4 100644
--- a/kernel/trace/trace_workqueue.c
+++ b/kernel/trace/trace_workqueue.c
@@ -6,7 +6,7 @@
*/
-#include <trace/workqueue.h>
+#include <trace/events/workqueue.h>
#include <linux/list.h>
#include <linux/percpu.h>
#include "trace_stat.h"
@@ -16,8 +16,6 @@
/* A cpu workqueue thread */
struct cpu_workqueue_stats {
struct list_head list;
-/* Useful to know if we print the cpu headers */
- bool first_entry;
int cpu;
pid_t pid;
/* Can be inserted from interrupt or user context, need to be atomic */
@@ -47,12 +45,11 @@ probe_workqueue_insertion(struct task_struct *wq_thread,
struct work_struct *work)
{
int cpu = cpumask_first(&wq_thread->cpus_allowed);
- struct cpu_workqueue_stats *node, *next;
+ struct cpu_workqueue_stats *node;
unsigned long flags;
spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
- list_for_each_entry_safe(node, next, &workqueue_cpu_stat(cpu)->list,
- list) {
+ list_for_each_entry(node, &workqueue_cpu_stat(cpu)->list, list) {
if (node->pid == wq_thread->pid) {
atomic_inc(&node->inserted);
goto found;
@@ -69,12 +66,11 @@ probe_workqueue_execution(struct task_struct *wq_thread,
struct work_struct *work)
{
int cpu = cpumask_first(&wq_thread->cpus_allowed);
- struct cpu_workqueue_stats *node, *next;
+ struct cpu_workqueue_stats *node;
unsigned long flags;
spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
- list_for_each_entry_safe(node, next, &workqueue_cpu_stat(cpu)->list,
- list) {
+ list_for_each_entry(node, &workqueue_cpu_stat(cpu)->list, list) {
if (node->pid == wq_thread->pid) {
node->executed++;
goto found;
@@ -105,8 +101,6 @@ static void probe_workqueue_creation(struct task_struct *wq_thread, int cpu)
cws->pid = wq_thread->pid;
spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
- if (list_empty(&workqueue_cpu_stat(cpu)->list))
- cws->first_entry = true;
list_add_tail(&cws->list, &workqueue_cpu_stat(cpu)->list);
spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
}
@@ -152,7 +146,7 @@ static struct cpu_workqueue_stats *workqueue_stat_start_cpu(int cpu)
return ret;
}
-static void *workqueue_stat_start(void)
+static void *workqueue_stat_start(struct tracer_stat *trace)
{
int cpu;
void *ret = NULL;
@@ -191,16 +185,9 @@ static void *workqueue_stat_next(void *prev, int idx)
static int workqueue_stat_show(struct seq_file *s, void *p)
{
struct cpu_workqueue_stats *cws = p;
- unsigned long flags;
- int cpu = cws->cpu;
struct pid *pid;
struct task_struct *tsk;
- spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
- if (&cws->list == workqueue_cpu_stat(cpu)->list.next)
- seq_printf(s, "\n");
- spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
-
pid = find_get_pid(cws->pid);
if (pid) {
tsk = get_pid_task(pid, PIDTYPE_PID);
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index f71fb2a..0668795 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -33,7 +33,8 @@
#include <linux/kallsyms.h>
#include <linux/debug_locks.h>
#include <linux/lockdep.h>
-#include <trace/workqueue.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/workqueue.h>
/*
* The per-CPU workqueue (if single thread, we always use the first
@@ -124,8 +125,6 @@ struct cpu_workqueue_struct *get_wq_data(struct work_struct *work)
return (void *) (atomic_long_read(&work->data) & WORK_STRUCT_WQ_DATA_MASK);
}
-DEFINE_TRACE(workqueue_insertion);
-
static void insert_work(struct cpu_workqueue_struct *cwq,
struct work_struct *work, struct list_head *head)
{
@@ -262,8 +261,6 @@ int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
}
EXPORT_SYMBOL_GPL(queue_delayed_work_on);
-DEFINE_TRACE(workqueue_execution);
-
static void run_workqueue(struct cpu_workqueue_struct *cwq)
{
spin_lock_irq(&cwq->lock);
@@ -753,8 +750,6 @@ init_cpu_workqueue(struct workqueue_struct *wq, int cpu)
return cwq;
}
-DEFINE_TRACE(workqueue_creation);
-
static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
{
struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
@@ -860,8 +855,6 @@ struct workqueue_struct *__create_workqueue_key(const char *name,
}
EXPORT_SYMBOL_GPL(__create_workqueue_key);
-DEFINE_TRACE(workqueue_destruction);
-
static void cleanup_workqueue_thread(struct cpu_workqueue_struct *cwq)
{
/*
diff --git a/mm/bounce.c b/mm/bounce.c
index e590272..65f5e17 100644
--- a/mm/bounce.c
+++ b/mm/bounce.c
@@ -14,16 +14,15 @@
#include <linux/hash.h>
#include <linux/highmem.h>
#include <linux/blktrace_api.h>
-#include <trace/block.h>
#include <asm/tlbflush.h>
+#include <trace/events/block.h>
+
#define POOL_SIZE 64
#define ISA_POOL_SIZE 16
static mempool_t *page_pool, *isa_page_pool;
-DEFINE_TRACE(block_bio_bounce);
-
#ifdef CONFIG_HIGHMEM
static __init int init_emergency_pool(void)
{
diff --git a/mm/mlock.c b/mm/mlock.c
index cbe9e05..ac13043 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -629,52 +629,43 @@ void user_shm_unlock(size_t size, struct user_struct *user)
free_uid(user);
}
-void *alloc_locked_buffer(size_t size)
+int account_locked_memory(struct mm_struct *mm, struct rlimit *rlim,
+ size_t size)
{
- unsigned long rlim, vm, pgsz;
- void *buffer = NULL;
+ unsigned long lim, vm, pgsz;
+ int error = -ENOMEM;
pgsz = PAGE_ALIGN(size) >> PAGE_SHIFT;
- down_write(¤t->mm->mmap_sem);
-
- rlim = current->signal->rlim[RLIMIT_AS].rlim_cur >> PAGE_SHIFT;
- vm = current->mm->total_vm + pgsz;
- if (rlim < vm)
- goto out;
+ down_write(&mm->mmap_sem);
- rlim = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT;
- vm = current->mm->locked_vm + pgsz;
- if (rlim < vm)
+ lim = rlim[RLIMIT_AS].rlim_cur >> PAGE_SHIFT;
+ vm = mm->total_vm + pgsz;
+ if (lim < vm)
goto out;
- buffer = kzalloc(size, GFP_KERNEL);
- if (!buffer)
+ lim = rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT;
+ vm = mm->locked_vm + pgsz;
+ if (lim < vm)
goto out;
- current->mm->total_vm += pgsz;
- current->mm->locked_vm += pgsz;
+ mm->total_vm += pgsz;
+ mm->locked_vm += pgsz;
+ error = 0;
out:
- up_write(¤t->mm->mmap_sem);
- return buffer;
+ up_write(&mm->mmap_sem);
+ return error;
}
-void release_locked_buffer(void *buffer, size_t size)
+void refund_locked_memory(struct mm_struct *mm, size_t size)
{
unsigned long pgsz = PAGE_ALIGN(size) >> PAGE_SHIFT;
- down_write(¤t->mm->mmap_sem);
-
- current->mm->total_vm -= pgsz;
- current->mm->locked_vm -= pgsz;
-
- up_write(¤t->mm->mmap_sem);
-}
+ down_write(&mm->mmap_sem);
-void free_locked_buffer(void *buffer, size_t size)
-{
- release_locked_buffer(buffer, size);
+ mm->total_vm -= pgsz;
+ mm->locked_vm -= pgsz;
- kfree(buffer);
+ up_write(&mm->mmap_sem);
}
diff --git a/mm/slab.c b/mm/slab.c
index 9a90b00..f85831d 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -102,7 +102,7 @@
#include <linux/cpu.h>
#include <linux/sysctl.h>
#include <linux/module.h>
-#include <trace/kmemtrace.h>
+#include <linux/kmemtrace.h>
#include <linux/rcupdate.h>
#include <linux/string.h>
#include <linux/uaccess.h>
diff --git a/mm/slob.c b/mm/slob.c
index a2d4ab3..494f05f 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -65,7 +65,7 @@
#include <linux/module.h>
#include <linux/rcupdate.h>
#include <linux/list.h>
-#include <trace/kmemtrace.h>
+#include <linux/kmemtrace.h>
#include <asm/atomic.h>
/*
diff --git a/mm/slub.c b/mm/slub.c
index 7ab54ec..ea9e716 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -16,7 +16,7 @@
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
-#include <trace/kmemtrace.h>
+#include <linux/kmemtrace.h>
#include <linux/cpu.h>
#include <linux/cpuset.h>
#include <linux/mempolicy.h>
diff --git a/mm/util.c b/mm/util.c
index 55bef16..abc65aa 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -4,9 +4,11 @@
#include <linux/module.h>
#include <linux/err.h>
#include <linux/sched.h>
-#include <linux/tracepoint.h>
#include <asm/uaccess.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/kmem.h>
+
/**
* kstrdup - allocate space for and copy an existing string
* @s: the string to duplicate
@@ -255,13 +257,6 @@ int __attribute__((weak)) get_user_pages_fast(unsigned long start,
EXPORT_SYMBOL_GPL(get_user_pages_fast);
/* Tracepoints definitions. */
-DEFINE_TRACE(kmalloc);
-DEFINE_TRACE(kmem_cache_alloc);
-DEFINE_TRACE(kmalloc_node);
-DEFINE_TRACE(kmem_cache_alloc_node);
-DEFINE_TRACE(kfree);
-DEFINE_TRACE(kmem_cache_free);
-
EXPORT_TRACEPOINT_SYMBOL(kmalloc);
EXPORT_TRACEPOINT_SYMBOL(kmem_cache_alloc);
EXPORT_TRACEPOINT_SYMBOL(kmalloc_node);
diff --git a/net/core/drop_monitor.c b/net/core/drop_monitor.c
index 9fd0dc3..b75b6ce 100644
--- a/net/core/drop_monitor.c
+++ b/net/core/drop_monitor.c
@@ -23,7 +23,7 @@
#include <linux/bitops.h>
#include <net/genetlink.h>
-#include <trace/skb.h>
+#include <trace/events/skb.h>
#include <asm/unaligned.h>
diff --git a/net/core/net-traces.c b/net/core/net-traces.c
index c8fb456..499a67e 100644
--- a/net/core/net-traces.c
+++ b/net/core/net-traces.c
@@ -19,11 +19,11 @@
#include <linux/workqueue.h>
#include <linux/netlink.h>
#include <linux/net_dropmon.h>
-#include <trace/skb.h>
#include <asm/unaligned.h>
#include <asm/bitops.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/skb.h>
-DEFINE_TRACE(kfree_skb);
EXPORT_TRACEPOINT_SYMBOL_GPL(kfree_skb);
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index d152394..c4906bb 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -65,7 +65,7 @@
#include <asm/uaccess.h>
#include <asm/system.h>
-#include <trace/skb.h>
+#include <trace/events/skb.h>
#include "kmap_skb.h"
diff --git a/samples/Kconfig b/samples/Kconfig
index 4b02f5a..b75d28c 100644
--- a/samples/Kconfig
+++ b/samples/Kconfig
@@ -19,6 +19,12 @@ config SAMPLE_TRACEPOINTS
help
This build tracepoints example modules.
+config SAMPLE_TRACE_EVENTS
+ tristate "Build trace_events examples -- loadable modules only"
+ depends on EVENT_TRACING && m
+ help
+ This build trace event example modules.
+
config SAMPLE_KOBJECT
tristate "Build kobject examples"
help
diff --git a/samples/Makefile b/samples/Makefile
index 10eaca8..13e4b47 100644
--- a/samples/Makefile
+++ b/samples/Makefile
@@ -1,3 +1,3 @@
# Makefile for Linux samples code
-obj-$(CONFIG_SAMPLES) += markers/ kobject/ kprobes/ tracepoints/
+obj-$(CONFIG_SAMPLES) += markers/ kobject/ kprobes/ tracepoints/ trace_events/
diff --git a/samples/trace_events/Makefile b/samples/trace_events/Makefile
new file mode 100644
index 0000000..0d428dc
--- /dev/null
+++ b/samples/trace_events/Makefile
@@ -0,0 +1,6 @@
+# builds the trace events example kernel modules;
+# then to use one (as root): insmod <module_name.ko>
+
+CFLAGS_trace-events-sample.o := -I$(src)
+
+obj-$(CONFIG_SAMPLE_TRACE_EVENTS) += trace-events-sample.o
diff --git a/samples/trace_events/trace-events-sample.c b/samples/trace_events/trace-events-sample.c
new file mode 100644
index 0000000..aabc4e9
--- /dev/null
+++ b/samples/trace_events/trace-events-sample.c
@@ -0,0 +1,52 @@
+#include <linux/module.h>
+#include <linux/kthread.h>
+
+/*
+ * Any file that uses trace points, must include the header.
+ * But only one file, must include the header by defining
+ * CREATE_TRACE_POINTS first. This will make the C code that
+ * creates the handles for the trace points.
+ */
+#define CREATE_TRACE_POINTS
+#include "trace-events-sample.h"
+
+
+static void simple_thread_func(int cnt)
+{
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(HZ);
+ trace_foo_bar("hello", cnt);
+}
+
+static int simple_thread(void *arg)
+{
+ int cnt = 0;
+
+ while (!kthread_should_stop())
+ simple_thread_func(cnt++);
+
+ return 0;
+}
+
+static struct task_struct *simple_tsk;
+
+static int __init trace_event_init(void)
+{
+ simple_tsk = kthread_run(simple_thread, NULL, "event-sample");
+ if (IS_ERR(simple_tsk))
+ return -1;
+
+ return 0;
+}
+
+static void __exit trace_event_exit(void)
+{
+ kthread_stop(simple_tsk);
+}
+
+module_init(trace_event_init);
+module_exit(trace_event_exit);
+
+MODULE_AUTHOR("Steven Rostedt");
+MODULE_DESCRIPTION("trace-events-sample");
+MODULE_LICENSE("GPL");
diff --git a/samples/trace_events/trace-events-sample.h b/samples/trace_events/trace-events-sample.h
new file mode 100644
index 0000000..128a897
--- /dev/null
+++ b/samples/trace_events/trace-events-sample.h
@@ -0,0 +1,129 @@
+/*
+ * Notice that this file is not protected like a normal header.
+ * We also must allow for rereading of this file. The
+ *
+ * || defined(TRACE_HEADER_MULTI_READ)
+ *
+ * serves this purpose.
+ */
+#if !defined(_TRACE_EVENT_SAMPLE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_EVENT_SAMPLE_H
+
+/*
+ * All trace headers should include tracepoint.h, until we finally
+ * make it into a standard header.
+ */
+#include <linux/tracepoint.h>
+
+/*
+ * If TRACE_SYSTEM is defined, that will be the directory created
+ * in the ftrace directory under /debugfs/tracing/events/<system>
+ *
+ * The define_trace.h belowe will also look for a file name of
+ * TRACE_SYSTEM.h where TRACE_SYSTEM is what is defined here.
+ *
+ * If you want a different system than file name, you can override
+ * the header name by defining TRACE_INCLUDE_FILE
+ *
+ * If this file was called, goofy.h, then we would define:
+ *
+ * #define TRACE_INCLUDE_FILE goofy
+ *
+ */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM sample
+
+/*
+ * The TRACE_EVENT macro is broken up into 5 parts.
+ *
+ * name: name of the trace point. This is also how to enable the tracepoint.
+ * A function called trace_foo_bar() will be created.
+ *
+ * proto: the prototype of the function trace_foo_bar()
+ * Here it is trace_foo_bar(char *foo, int bar).
+ *
+ * args: must match the arguments in the prototype.
+ * Here it is simply "foo, bar".
+ *
+ * struct: This defines the way the data will be stored in the ring buffer.
+ * There are currently two types of elements. __field and __array.
+ * a __field is broken up into (type, name). Where type can be any
+ * type but an array.
+ * For an array. there are three fields. (type, name, size). The
+ * type of elements in the array, the name of the field and the size
+ * of the array.
+ *
+ * __array( char, foo, 10) is the same as saying char foo[10].
+ *
+ * fast_assign: This is a C like function that is used to store the items
+ * into the ring buffer.
+ *
+ * printk: This is a way to print out the data in pretty print. This is
+ * useful if the system crashes and you are logging via a serial line,
+ * the data can be printed to the console using this "printk" method.
+ *
+ * Note, that for both the assign and the printk, __entry is the handler
+ * to the data structure in the ring buffer, and is defined by the
+ * TP_STRUCT__entry.
+ */
+TRACE_EVENT(foo_bar,
+
+ TP_PROTO(char *foo, int bar),
+
+ TP_ARGS(foo, bar),
+
+ TP_STRUCT__entry(
+ __array( char, foo, 10 )
+ __field( int, bar )
+ ),
+
+ TP_fast_assign(
+ strncpy(__entry->foo, foo, 10);
+ __entry->bar = bar;
+ ),
+
+ TP_printk("foo %s %d", __entry->foo, __entry->bar)
+);
+#endif
+
+/***** NOTICE! The #if protection ends here. *****/
+
+
+/*
+ * There are several ways I could have done this. If I left out the
+ * TRACE_INCLUDE_PATH, then it would default to the kernel source
+ * include/trace/events directory.
+ *
+ * I could specify a path from the define_trace.h file back to this
+ * file.
+ *
+ * #define TRACE_INCLUDE_PATH ../../samples/trace_events
+ *
+ * But I chose to simply make it use the current directory and then in
+ * the Makefile I added:
+ *
+ * CFLAGS_trace-events-sample.o := -I$(PWD)/samples/trace_events/
+ *
+ * This will make sure the current path is part of the include
+ * structure for our file so that we can find it.
+ *
+ * I could have made only the top level directory the include:
+ *
+ * CFLAGS_trace-events-sample.o := -I$(PWD)
+ *
+ * And then let the path to this directory be the TRACE_INCLUDE_PATH:
+ *
+ * #define TRACE_INCLUDE_PATH samples/trace_events
+ *
+ * But then if something defines "samples" or "trace_events" then we
+ * could risk that being converted too, and give us an unexpected
+ * result.
+ */
+#undef TRACE_INCLUDE_PATH
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_PATH .
+/*
+ * TRACE_INCLUDE_FILE is not needed if the filename and TRACE_SYSTEM are equal
+ */
+#define TRACE_INCLUDE_FILE trace-events-sample
+#include <trace/define_trace.h>
diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index 3208a3a..acd8c4a 100755
--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -1828,6 +1828,25 @@ sub reset_state {
$state = 0;
}
+sub tracepoint_munge($) {
+ my $file = shift;
+ my $tracepointname = 0;
+ my $tracepointargs = 0;
+
+ if($prototype =~ m/TRACE_EVENT\((.*?),/) {
+ $tracepointname = $1;
+ }
+ if($prototype =~ m/TP_PROTO\((.*?)\)/) {
+ $tracepointargs = $1;
+ }
+ if (($tracepointname eq 0) || ($tracepointargs eq 0)) {
+ print STDERR "Warning(${file}:$.): Unrecognized tracepoint format: \n".
+ "$prototype\n";
+ } else {
+ $prototype = "static inline void trace_$tracepointname($tracepointargs)";
+ }
+}
+
sub syscall_munge() {
my $void = 0;
@@ -1882,6 +1901,9 @@ sub process_state3_function($$) {
if ($prototype =~ /SYSCALL_DEFINE/) {
syscall_munge();
}
+ if ($prototype =~ /TRACE_EVENT/) {
+ tracepoint_munge($file);
+ }
dump_function($prototype, $file);
reset_state();
}
diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
index 409596e..0fae7da 100755
--- a/scripts/recordmcount.pl
+++ b/scripts/recordmcount.pl
@@ -26,7 +26,7 @@
# which will also be the location of that section after final link.
# e.g.
#
-# .section ".text.sched"
+# .section ".sched.text", "ax"
# .globl my_func
# my_func:
# [...]
@@ -39,7 +39,7 @@
# [...]
#
# Both relocation offsets for the mcounts in the above example will be
-# offset from .text.sched. If we make another file called tmp.s with:
+# offset from .sched.text. If we make another file called tmp.s with:
#
# .section __mcount_loc
# .quad my_func + 0x5
@@ -51,7 +51,7 @@
# But this gets hard if my_func is not globl (a static function).
# In such a case we have:
#
-# .section ".text.sched"
+# .section ".sched.text", "ax"
# my_func:
# [...]
# call mcount (offset: 0x5)
--
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