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Date: Thu, 27 Apr 2023 18:45:00 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>,
LKML <linux-kernel@...r.kernel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Beau Belgrave <beaub@...ux.microsoft.com>,
Florent Revest <revest@...omium.org>,
Hao Zeng <zenghao@...inos.cn>,
Johannes Berg <johannes.berg@...el.com>,
Ken Lin <lyenting@...gle.com>,
Mark Rutland <mark.rutland@....com>,
"Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
Ross Zwisler <zwisler@...gle.com>,
Sergey Senozhatsky <senozhatsky@...omium.org>,
Tze-nan Wu <Tze-nan.Wu@...iatek.com>,
Uros Bizjak <ubizjak@...il.com>,
Zheng Yejian <zhengyejian1@...wei.com>
Subject: [GIT PULL] tracing: Updates for 6.4
[ Resending, as I forgot to include LKML! ]
Linus,
[
Note: The beginning of the commits includes commits I shared with arm64
that they needed for implementing their direct trampolines. If you merged
their branch, then you may already have those commits.
]
tracing updates for 6.4:
- User events are finally ready!
After lots of collaboration between various parties, we finally locked
down on a stable interface for user events that can also work with user
space only tracing. This is implemented by telling the kernel (or user
space library, but that part is user space only and not part of this
patch set), where the variable is that the application uses to know if
something is listening to the trace. There's also an interface to tell
the kernel about these events, which will show up in the
/sys/kernel/tracing/events/user_events/ directory, where it can be
enabled. When it's enabled, the kernel will update the variable, to tell
the application to start writing to the kernel.
See https://lwn.net/Articles/927595/
- Cleaned up the direct trampolines code to simplify arm64 addition of
direct trampolines. Direct trampolines use the ftrace interface but
instead of jumping to the ftrace trampoline, applications (mostly BPF)
can register their own trampoline for performance reasons.
- Some updates to the fprobe infrastructure. fprobes are more efficient than
kprobes, as it does not need to save all the registers that kprobes on
ftrace do. More work needs to be done before the fprobes will be exposed
as dynamic events.
- More updates to references to the obsolete path of
/sys/kernel/debug/tracing for the new /sys/kernel/tracing path.
- Add a seq_buf_do_printk() helper to seq_bufs, to print a large buffer line
by line instead of all at once. There's users in production kernels that
have a large data dump that originally used printk() directly, but the
data dump was larger than what printk() allowed as a single print.
Using seq_buf() to do the printing fixes that.
- Add /sys/kernel/tracing/touched_functions that shows all functions that
was every traced by ftrace or a direct trampoline. This is used for
debugging issues where a traced function could have caused a crash by
a bpf program or live patching.
- Add a "fields" option that is similar to "raw" but outputs the fields of
the events. It's easier to read by humans.
- Some minor fixes and clean ups.
Please pull the latest trace-v6.4 tree, which can be found at:
git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git
trace-v6.4
Tag SHA1: 4c817fb7dde5c2bf6d5b5f3eac9b1ff75125356d
Head SHA1: 675751bb20634f981498c7d66161584080cc061e
Beau Belgrave (18):
tracing/user_events: Split header into uapi and kernel
tracing/user_events: Track fork/exec/exit for mm lifetime
tracing/user_events: Use remote writes for event enablement
tracing/user_events: Fixup enable faults asyncly
tracing/user_events: Add ioctl for disabling addresses
tracing/user_events: Update self-tests to write ABI
tracing/user_events: Add ABI self-test
tracing/user_events: Use write ABI in example
tracing/user_events: Update documentation for ABI
tracing/user_events: Charge event allocs to cgroups
tracing/user_events: Limit global user_event count
tracing/user_events: Align structs with tabs for readability
tracing/user_events: Set event filter_type from type
tracing: Fix print_fields() for __dyn_loc/__rel_loc
tracing/user_events: Ensure write index cannot be negative
tracing/user_events: Ensure bit is cleared on unregister
tracing/user_events: Prevent same address and bit per process
tracing/user_events: Limit max fault-in attempts
Florent Revest (6):
ftrace: Let unregister_ftrace_direct_multi() call ftrace_free_filter()
ftrace: Replace uses of _ftrace_direct APIs with _ftrace_direct_multi
ftrace: Remove the legacy _ftrace_direct API
ftrace: Rename _ftrace_direct_multi APIs to _ftrace_direct APIs
ftrace: Store direct called addresses in their ops
ftrace: Make DIRECT_CALLS work WITH_ARGS and !WITH_REGS
Hao Zeng (1):
recordmcount: Fix memory leaks in the uwrite function
Johannes Berg (1):
ring-buffer: Sync IRQ works before buffer destruction
Ken Lin (1):
tracing: Add missing spaces in trace_print_hex_seq()
Mark Rutland (1):
ftrace: selftest: remove broken trace_direct_tramp
Masami Hiramatsu (Google) (7):
fprobe: Pass entry_data to handlers
lib/test_fprobe: Add private entry_data testcases
fprobe: Add nr_maxactive to specify rethook_node pool size
lib/test_fprobe: Add a test case for nr_maxactive
fprobe: Skip exit_handler if entry_handler returns !0
lib/test_fprobe: Add a testcase for skipping exit_handler
docs: tracing: Update fprobe documentation
Ross Zwisler (3):
selftests: use canonical ftrace path
leaking_addresses: also skip canonical ftrace path
tools/kvm_stat: use canonical ftrace path
Sergey Senozhatsky (1):
seq_buf: Add seq_buf_do_printk() helper
Steven Rostedt (Google) (4):
ftrace: Show a list of all functions that have ever been enabled
tracing: Add "fields" option to show raw trace event fields
tracing/user_events: Use print_format_fields() for trace output
tracing: Unbreak user events
Tze-nan Wu (1):
ring-buffer: Ensure proper resetting of atomic variables in
ring_buffer_reset_online_cpus
Uros Bizjak (3):
ring_buffer: Change some static functions to void
ring_buffer: Change some static functions to bool
ring_buffer: Use try_cmpxchg instead of cmpxchg
Zheng Yejian (1):
ring-buffer: Clearly check null ptr returned by rb_set_head_page()
----
Documentation/trace/fprobe.rst | 16 +-
Documentation/trace/ftrace.rst | 6 +
Documentation/trace/user_events.rst | 167 ++--
arch/s390/kernel/mcount.S | 5 +
arch/x86/kernel/ftrace_32.S | 5 +
arch/x86/kernel/ftrace_64.S | 4 +
fs/exec.c | 2 +
include/linux/fprobe.h | 10 +-
include/linux/ftrace.h | 66 +-
include/linux/sched.h | 5 +
include/linux/seq_buf.h | 2 +
include/linux/user_events.h | 101 +-
include/uapi/linux/user_events.h | 81 ++
kernel/bpf/trampoline.c | 12 +-
kernel/exit.c | 2 +
kernel/fork.c | 2 +
kernel/trace/Kconfig | 8 +-
kernel/trace/bpf_trace.c | 17 +-
kernel/trace/fprobe.c | 32 +-
kernel/trace/ftrace.c | 489 ++--------
kernel/trace/ring_buffer.c | 102 +-
kernel/trace/trace.c | 7 +-
kernel/trace/trace.h | 2 +
kernel/trace/trace_events_user.c | 1034
+++++++++++++++++---- kernel/trace/trace_output.c |
175 +++- kernel/trace/trace_output.h | 2 +
kernel/trace/trace_selftest.c | 19 +-
lib/seq_buf.c | 32 +
lib/test_fprobe.c | 105 ++-
samples/Kconfig | 2 +-
samples/fprobe/fprobe_example.c | 7 +-
samples/ftrace/ftrace-direct-modify.c | 10 +-
samples/ftrace/ftrace-direct-multi-modify.c | 9 +-
samples/ftrace/ftrace-direct-multi.c | 5 +-
samples/ftrace/ftrace-direct-too.c | 10 +-
samples/ftrace/ftrace-direct.c | 10 +-
samples/user_events/example.c | 45 +-
scripts/leaking_addresses.pl | 1 +
scripts/recordmcount.c | 6 +-
tools/kvm/kvm_stat/kvm_stat | 2 +-
tools/testing/selftests/mm/protection_keys.c | 4 +-
tools/testing/selftests/user_events/Makefile | 2 +-
tools/testing/selftests/user_events/abi_test.c | 229 +++++
tools/testing/selftests/user_events/dyn_test.c | 2 +-
tools/testing/selftests/user_events/ftrace_test.c | 176 ++--
tools/testing/selftests/user_events/perf_test.c | 39 +-
46 files changed, 2060 insertions(+), 1009 deletions(-)
create mode 100644 include/uapi/linux/user_events.h
create mode 100644 tools/testing/selftests/user_events/abi_test.c
---------------------------
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