linux-kernel - [PATCH] sched: fix tracepoint in scheduler.

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Date:	Thu, 3 Apr 2014 20:12:48 +0800
From:	Dongsheng Yang <yangds.fnst@...fujitsu.com>
To:	<mingo@...hat.com>, <peterz@...radead.org>
CC:	<linux-kernel@...r.kernel.org>,
	Dongsheng Yang <yangds.fnst@...fujitsu.com>
Subject: [PATCH] sched: fix tracepoint in scheduler.

In function set_task_cpu(), if cpu == new_cpu,
there is no migration happen. But current trace point
will raise a migration trace event.

This patch change trace point to right place,
only when migration really happen, an event will
be threw out.

Signed-off-by: Dongsheng Yang <yangds.fnst@...fujitsu.com>
---
 kernel/sched/core.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 9cae286..6708aff 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -998,9 +998,8 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
 #endif
 #endif
 
-	trace_sched_migrate_task(p, new_cpu);
-
 	if (task_cpu(p) != new_cpu) {
+		trace_sched_migrate_task(p, new_cpu);
 		if (p->sched_class->migrate_task_rq)
 			p->sched_class->migrate_task_rq(p, new_cpu);
 		p->se.nr_migrations++;
-- 
1.8.2.1

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