linux-kernel - [PATCH 2/5] sched: send the event sched_switch before perf_event_task_sched

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Date:	Mon,  4 Jun 2012 12:09:39 +0400
From:	Andrew Vagin <avagin@...nvz.org>
To:	unlisted-recipients:; (no To-header on input)
Cc:	Arun Sharma <asharma@...com>, Oleg Strikov <OSTRIKOV@...dia.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] sched: send the event sched_switch before perf_event_task_sched_out

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@...nvz.org>
---
 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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