[PATCH 2/5] sched: send the event sched_switch before perf_event_task_sched_out

[Andrew Vagin]

Otherwice they can't be filtered for a defined task.

perf record -e sched:sched_switch ./foo

This command doesn't report any event without this patch.

Signed-off-by: Andrew Vagin <avagin@xxxxxxxxxx>
---
 kernel/sched/core.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 39eb601..e17a3ec 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1911,12 +1911,12 @@ 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);
 }
 
 /**
@@ -1976,6 +1976,7 @@ static void finish_task_switch(struct rq *rq, struct task_struct *prev)
 		kprobe_flush_task(prev);
 		put_task_struct(prev);
 	}
+	trace_sched_switch_finish(current);
 }
 
 #ifdef CONFIG_SMP
-- 
1.7.1

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