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| author | Andrew Vagin <avagin@openvz.org> | 2012-07-12 14:14:29 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-07-26 12:23:10 +0200 |
| commit | 895dd92c032e1604aa0d7afaef7716e058343b67 (patch) | |
| tree | 8662091be28c24a44287fc43790cf92547499a83 /kernel/sched | |
| parent | 045e7e6047037d93824d265cc30c33eb631f8883 (diff) | |
| download | linux-895dd92c032e1604aa0d7afaef7716e058343b67.tar.gz linux-895dd92c032e1604aa0d7afaef7716e058343b67.tar.bz2 linux-895dd92c032e1604aa0d7afaef7716e058343b67.zip | |
sched: Deliver sched_switch events to the current task
Otherwise they can't be filtered for a defined task:
perf record -e sched:sched_switch ./foo
This command doesn't report any events without this patch.
I think it isn't a security concern if someone knows who will
be executed next - this can already be observed by polling /proc
state. By default perf is disabled for non-root users in any case.
I need these events for profiling sleep times. sched_switch is used for
getting callchains and sched_stat_* is used for getting time periods.
These events are combined in user space, then it can be analyzed by
perf tools.
Signed-off-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Arun Sharma <asharma@fb.com>
Link: http://lkml.kernel.org/r/1342088069-1005148-1-git-send-email-avagin@openvz.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 468bdd44c1ba..ad732b56ba70 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1910,12 +1910,12 @@ static inline void prepare_task_switch(struct rq *rq, struct task_struct *prev, struct task_struct *next) { + trace_sched_switch(prev, next); sched_info_switch(prev, next); perf_event_task_sched_out(prev, next); fire_sched_out_preempt_notifiers(prev, next); prepare_lock_switch(rq, next); prepare_arch_switch(next); - trace_sched_switch(prev, next); } /** |