linux-kernel - [PATCH 06/12] sched: relocate fire_sched_notifiers_out() and trace_sched

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Date:	Tue,  4 May 2010 14:38:38 +0200
From:	Tejun Heo <tj@...nel.org>
To:	mingo@...e.hu, peterz@...radead.org, efault@....de, avi@...hat.com,
	paulus@...ba.org, acme@...hat.com, linux-kernel@...r.kernel.org
Cc:	Tejun Heo <tj@...nel.org>
Subject: [PATCH 06/12] sched: relocate fire_sched_notifiers_out() and trace_sched_switch()

Relocate fire_sched_notifiers_out() from prepare_task_switch() and
trace_sched_switch() from context_switch() to schedule() so that
trace_sched_switch(), perf_event_task_sched_out() and
fire_sched_notifiers_out() are colocated.

Both are now called before switch counts and rq->curr are updated and
in addition trace_sched_switch() is called before
prepare_lock/arch_switch(); however, this shouldn't make any visible
different for either.

This will help unifying notifiers in sched.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Avi Kivity <avi@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Mike Galbraith <efault@....de>
Cc: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index df6e0af..0b753f0 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2753,7 +2753,6 @@ static inline void
 prepare_task_switch(struct rq *rq, struct task_struct *prev,
 		    struct task_struct *next)
 {
-	fire_sched_notifiers_out(prev, next);
 	prepare_lock_switch(rq, next);
 	prepare_arch_switch(next);
 }
@@ -2882,7 +2881,6 @@ context_switch(struct rq *rq, struct task_struct *prev,
 	struct mm_struct *mm, *oldmm;
 
 	prepare_task_switch(rq, prev, next);
-	trace_sched_switch(rq, prev, next);
 	mm = next->mm;
 	oldmm = prev->active_mm;
 	/*
@@ -3714,7 +3712,9 @@ need_resched_nonpreemptible:
 
 	if (likely(prev != next)) {
 		sched_info_switch(prev, next);
+		trace_sched_switch(rq, prev, next);
 		perf_event_task_sched_out(rq, prev, next);
+		fire_sched_notifiers_out(prev, next);
 
 		rq->nr_switches++;
 		rq->curr = next;
-- 
1.6.4.2

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