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Message-ID: <1389115745.3040.104.camel@empanada>
Date: Tue, 07 Jan 2014 11:29:05 -0600
From: Tom Zanussi <tom.zanussi@...ux.intel.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: masami.hiramatsu.pt@...achi.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] tracing/triggers: A couple minor variable name
changes
On Mon, 2014-01-06 at 22:27 -0500, Steven Rostedt wrote:
> On Mon, 06 Jan 2014 20:51:09 -0600
> Tom Zanussi <tom.zanussi@...ux.intel.com> wrote:
>
>
> > > Hmm, OK, I think you may have convinced me. I'll swap the return values.
> > >
> >
> > Sounds great, thanks!
>
> New patch.
>
Looks good to me and passes my normal testing.
Acked-by: Tom Zanussi <tom.zanussi@...ux.intel.com>
Tested-by: Tom Zanussi <tom.zanussi@...ux.intel.com>
Just so you know what encompasses my 'normal testing', below is what I
normally run through - if everything checks out, I'm satisfied things
are basically good, though of course it didn't catch your traceoff bug
so it's not complete.
As soon as I get the chance, I'll automate it and add more tests for
completeness - as it is it's grown into something that already takes too
long to do manually, so I need to find the time....
---- basic high-level check
- quick enable/disable_event, capture limited number of events
- both counted and not
- verify flags
- verify removal
# echo 'enable_event:kmem:kmalloc:1' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/trigger;cat ~/junk.txt > /dev/null;echo 'disable_event:kmem:kmalloc' > /sys/kernel/debug/tracing/events/syscalls/sys_exit_read/trigger
# cat /sys/kernel/debug/tracing/events/kmem/kmalloc/enable
0*
# cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/trigger
enable_event:kmem:kmalloc:count=0
# cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/enable
0*
# cat /sys/kernel/debug/tracing/events/syscalls/sys_exit_read/trigger
disable_event:kmem:kmalloc:unlimited
# cat /sys/kernel/debug/tracing/events/syscalls/sys_exit_read/enable
0*
# cat /sys/kernel/debug/tracing/trace
# echo '!enable_event:kmem:kmalloc:1' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/trigger
# echo '!disable_event:kmem:kmalloc' > /sys/kernel/debug/tracing/events/syscalls/sys_exit_read/trigger
# cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/trigger
# cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/enable
0
# cat /sys/kernel/debug/tracing/events/kmem/kmalloc/enable
0
---- basic stacktrace checks
- both counted and not
- trigger filter
# echo 'stacktrace' > /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
# cat /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
stacktrace:unlimited
# cat /sys/kernel/debug/tracing/trace
# echo '!stacktrace' > /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
# echo > /sys/kernel/debug/tracing/trace
# echo 'stacktrace:5 if bytes_req >= 512' > /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
# cat /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
stacktrace:count=0 if bytes_req >= 512
# cat /sys/kernel/debug/tracing/trace
# echo '!stacktrace:5 if bytes_req >= 512' > /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
# cat /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
# echo 'stacktrace:5 if bytes_req >= 65536' > /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
# cat /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
stacktrace:count=5 if bytes_req >= 65536
# echo '!stacktrace:5' > /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
---- basic snapshot
- enable all block events, capture leadup to event
- snapshot with filter
# echo 1 > /sys/kernel/debug/tracing/events/block/enable
# echo 'snapshot:1 if nr_rq > 1' > /sys/kernel/debug/tracing/events/block/block_unplug/trigger
# cat /sys/kernel/debug/tracing/snapshot
# cat /sys/kernel/debug/tracing/events/block/block_unplug/trigger
# cat /sys/kernel/debug/tracing/events/block/block_unplug/enable
1*
# echo '!snapshot:1 if nr_rq > 1' > /sys/kernel/debug/tracing/events/block/block_unplug/trigger
# cat /sys/kernel/debug/tracing/events/block/block_unplug/trigger
# cat /sys/kernel/debug/tracing/events/block/block_unplug/enable
1
---- basic traceon/traceoff
- enable all block events, capture leadup to event
- traceoff with filter
# echo 'traceoff:1 if nr_rq > 1' > /sys/kernel/debug/tracing/events/block/block_unplug/trigger
# cat /sys/kernel/debug/tracing/events/block/block_unplug/trigger
# cat /sys/kernel/debug/tracing/events/block/block_unplug/enable
# cat /sys/kernel/debug/tracing/trace
# cat /sys/kernel/debug/tracing/tracing_on
0
# echo '!traceoff:1 if nr_rq > 1' > /sys/kernel/debug/tracing/events/block/block_unplug/trigger
# cat /sys/kernel/debug/tracing/events/block/block_unplug/enable
1
# echo 0 > /sys/kernel/debug/tracing/events/block/enable
# cat /sys/kernel/debug/tracing/events/block/block_unplug/enable
# echo 1 > /sys/kernel/debug/tracing/tracing_on
---- multi buffer non-syscall filter test
echo > /sys/kernel/debug/tracing/trace
echo 'bytes_alloc > 8192' > /sys/kernel/debug/tracing/events/kmem/kmalloc/filter
cat /sys/kernel/debug/tracing/events/kmem/kmalloc/filter
bytes_alloc > 8192
mkdir /sys/kernel/debug/tracing/instances/test1
echo 'bytes_alloc > 2048' > /sys/kernel/debug/tracing/instances/test1/events/kmem/kmalloc/filter
cat /sys/kernel/debug/tracing/events/kmem/kmalloc/filter
bytes_alloc > 8192
cat /sys/kernel/debug/tracing/instances/test1/events/kmem/kmalloc/filter
bytes_alloc > 2048
echo 1 > /sys/kernel/debug/tracing/events/kmem/kmalloc/enable
cat /sys/kernel/debug/tracing/trace
echo 1 > /sys/kernel/debug/tracing/instances/test1/events/kmem/kmalloc/enable
cat /sys/kernel/debug/tracing/instances/test1/trace
echo 0 > /sys/kernel/debug/tracing/events/kmem/kmalloc/enable
echo 0 > /sys/kernel/debug/tracing/instances/test1/events/kmem/kmalloc/enable
echo 0 > /sys/kernel/debug/tracing/events/kmem/kmalloc/filter
echo 0 > /sys/kernel/debug/tracing/instances/test1/events/kmem/kmalloc/filter
rmdir /sys/kernel/debug/tracing/instances/test1
--- multi buffer filter test
echo > /sys/kernel/debug/tracing/trace
echo 'count > 65536' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/filter
echo 1 > /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/enable
cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/filter
cat /sys/kernel/debug/tracing/trace
mkdir /sys/kernel/debug/tracing/instances/test1
echo 'count > 4096' > /sys/kernel/debug/tracing/instances/test1/events/syscalls/sys_enter_read/filter
echo 1 > /sys/kernel/debug/tracing/instances/test1/events/syscalls/sys_enter_read/enable
cat /sys/kernel/debug/tracing/instances/test1/events/syscalls/sys_enter_read/filter
cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/filter
cat /sys/kernel/debug/tracing/instances/test1/trace
cat /sys/kernel/debug/tracing/trace
echo 0 > /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/filter
echo 0 > /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/enable
rmdir /sys/kernel/debug/tracing/instances/test1
---- multi-buffer trigger enable
# mkdir /sys/kernel/debug/tracing/instances/hoge
# echo 'enable_event:mce:mce_record' > /sys/kernel/debug/tracing/instances/hoge/events/syscalls/sys_enter_symlink/trigger
# cat /sys/kernel/debug/tracing/instances/hoge/events/syscalls/sys_enter_symlink/enable
0*
# cat /sys/kernel/debug/tracing/instances/hoge/events/mce/mce_record/enable
0*
# cat /sys/kernel/debug/tracing/events/mce/mce_record/enable
0
# ln -sf /dev/null /tmp
# cat /sys/kernel/debug/tracing/instances/hoge/events/mce/mce_record/enable
1*
# cat /sys/kernel/debug/tracing/events/mce/mce_record/enable
0
# rmdir /sys/kernel/debug/tracing/instances/hoge
---- enabled plus trigger test
- verify triggers work on enabled event
echo > /sys/kernel/debug/tracing/trace
echo 1 > /sys/kernel/debug/tracing/events/syscalls/sys_enter_fsync/enable
echo 'stacktrace' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_fsync/trigger
cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_fsync/trigger
# do an emacs save to test fsync
cat /sys/kernel/debug/tracing/trace
echo 0 > /sys/kernel/debug/tracing/events/syscalls/sys_enter_fsync/enable
echo '!stacktrace' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_fsync/trigger
---- multi-event trigger test, stack + enable
- verify multiple triggers on single event
echo > /sys/kernel/debug/tracing/trace
# registers syscall tracepoint
echo 'stacktrace' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
echo 'enable_event:kmem:kmalloc:1' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
# do a perf stat to test
cat /sys/kernel/debug/tracing/trace
cat /sys/kernel/debug/tracing/events/kmem/kmalloc/enable
echo 0 > /sys/kernel/debug/tracing/events/kmem/kmalloc/enable
echo '!stacktrace' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
echo '!enable_event:kmem:kmalloc:1' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
---- multi-event trigger test, two enables
- verify multiple enable_event triggers on single event
echo > /sys/kernel/debug/tracing/trace
# registers syscall tracepoint
echo 'enable_event:kmem:kmalloc:1' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
echo 'enable_event:kmem:kfree:1' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
# do a perf stat to test
cat /sys/kernel/debug/tracing/trace
cat /sys/kernel/debug/tracing/events/kmem/kmalloc/enable
cat /sys/kernel/debug/tracing/events/kmem/kfree/enable
echo 0 > /sys/kernel/debug/tracing/events/kmem/kmalloc/enable
echo 0 > /sys/kernel/debug/tracing/events/kmem/kfree/enable
echo '!enable_event:kmem:kmalloc:1' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
echo '!enable_event:kmem:kfree:1' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
---- multi-event trigger test, two enables, one with filter
- verify multiple enable_event triggers with filters
- also verify when only one triggers, other filtered out
- also verify no multiple same-type events
echo > /sys/kernel/debug/tracing/trace
# registers syscall tracepoint
echo 'enable_event:kmem:kmalloc:1 if common_preempt_count == 2' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
# just to test that same event set with different filter or same event with different count can't be set
echo 'enable_event:kmem:kmalloc:1 if common_preempt_count == 1' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
echo 'enable_event:kmem:kmalloc if common_preempt_count == 1' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
echo: write error: File exists
cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/enable
cat /sys/kernel/debug/tracing/events/kmem/kmalloc/enable
echo 'enable_event:kmem:kfree:1' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
# do a perf stat to test
cat /sys/kernel/debug/tracing/trace
echo '!enable_event:kmem:kmalloc:1 if common_preempt_count == 2' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
echo 'enable_event:kmem:kmalloc:1 if common_preempt_count == 1' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
# do a perf stat to test
cat /sys/kernel/debug/tracing/trace
echo '!enable_event:kmem:kmalloc:1 if common_preempt_count == 1' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
echo 'enable_event:kmem:kmalloc:1 if common_preempt_count <= 1' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
# do a perf stat to test
cat /sys/kernel/debug/tracing/trace
echo '!enable_event:kmem:kmalloc:1' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
echo '!enable_event:kmem:kfree:1' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
cat /sys/kernel/debug/tracing/events/kmem/kmalloc/enable
cat /sys/kernel/debug/tracing/events/kmem/kfree/enable
echo 0 > /sys/kernel/debug/tracing/events/kmem/kmalloc/enable
echo 0 > /sys/kernel/debug/tracing/events/kmem/kfree/enable
---- multi-event trigger test, two non-enable
- multiple non-enable/disable triggers
echo > /sys/kernel/debug/tracing/trace
# registers syscall tracepoint
echo 'stacktrace' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
echo 'snapshot' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
# do a perf stat to test
cat /sys/kernel/debug/tracing/trace
cat /sys/kernel/debug/tracing/snapshot
echo '!stacktrace' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
echo '!snapshot' > /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_perf_event_open/trigger
---- multi-event trigger test, two non-enable on non-syscall, one with filter
- verify multiple triggers on non-syscall event
- one with filter
- general removal syntax on counted
echo > /sys/kernel/debug/tracing/trace
# registers syscall tracepoint
echo 'stacktrace:5' > /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
echo 'snapshot:5 if bytes_req >= 4096' > /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
cat /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
cat /sys/kernel/debug/tracing/trace
cat /sys/kernel/debug/tracing/snapshot
echo '!stacktrace' > /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
cat /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
echo '!snapshot' > /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
cat /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
---- kprobes - basic check
- stacktrace triggered by kprobe
echo > /sys/kernel/debug/tracing/trace
perf probe -a in_kmalloc=__kmalloc
echo 'stacktrace' > /sys/kernel/debug/tracing/events/probe/in_kmalloc/trigger
perf record -e probe:in_kmalloc -aR sleep 10&
perf report
cat /sys/kernel/debug/tracing/trace
cat /sys/kernel/debug/tracing/events/probe/in_kmalloc/trigger
echo '!stacktrace' > /sys/kernel/debug/tracing/events/probe/in_kmalloc/trigger
perf probe -d in_kmalloc
---- kprobes - enable normal event from kprobe event
echo > /sys/kernel/debug/tracing/trace
perf probe -a in_kmalloc=__kmalloc
echo 'enable_event:kmem:kfree:1' > /sys/kernel/debug/tracing/events/probe/in_kmalloc/trigger
cat /sys/kernel/debug/tracing/trace
cat /sys/kernel/debug/tracing/events/probe/in_kmalloc/trigger
echo '!enable_event:kmem:kfree:1' > /sys/kernel/debug/tracing/events/probe/in_kmalloc/trigger
cat /sys/kernel/debug/tracing/events/kmem/kfree/enable
echo 0 > /sys/kernel/debug/tracing/events/kmem/kfree/enable
perf probe -d in_kmalloc
---- kprobes - enable kprobe event from normal event
echo > /sys/kernel/debug/tracing/trace
perf probe -a in_kmalloc=__kmalloc
echo 'enable_event:probe:in_kmalloc:1' > /sys/kernel/debug/tracing/events/kmem/kfree/trigger
cat /sys/kernel/debug/tracing/trace
cat /sys/kernel/debug/tracing/events/kmem/kfree/trigger
cat /sys/kernel/debug/tracing/events/probe/in_kmalloc/enable
echo 0 > /sys/kernel/debug/tracing/events/probe/in_kmalloc/enable
echo '!enable_event:probe:in_kmalloc:1' > /sys/kernel/debug/tracing/events/kmem/kfree/trigger
perf probe -d in_kmalloc
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