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authorPeter Zijlstra <peterz@infradead.org>2012-02-11 06:05:00 +0100
committerIngo Molnar <mingo@kernel.org>2014-02-10 16:17:13 +0100
commit606dba2e289446600a0b68422ed2019af5355c12 (patch)
tree286562f6ddcca34f3f029b68507b820f0c81b707 /kernel/sched/idle_task.c
parentfed14d45f945042a15b09de48d7d3d58d9455fc4 (diff)
downloadop-kernel-dev-606dba2e289446600a0b68422ed2019af5355c12.zip
op-kernel-dev-606dba2e289446600a0b68422ed2019af5355c12.tar.gz
sched: Push put_prev_task() into pick_next_task()
In order to avoid having to do put/set on a whole cgroup hierarchy when we context switch, push the put into pick_next_task() so that both operations are in the same function. Further changes then allow us to possibly optimize away redundant work. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1328936700.2476.17.camel@laptop Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/idle_task.c')
-rw-r--r--kernel/sched/idle_task.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/sched/idle_task.c b/kernel/sched/idle_task.c
index 516c3d9..e5c922a 100644
--- a/kernel/sched/idle_task.c
+++ b/kernel/sched/idle_task.c
@@ -33,8 +33,12 @@ static void check_preempt_curr_idle(struct rq *rq, struct task_struct *p, int fl
resched_task(rq->idle);
}
-static struct task_struct *pick_next_task_idle(struct rq *rq)
+static struct task_struct *
+pick_next_task_idle(struct rq *rq, struct task_struct *prev)
{
+ if (prev)
+ prev->sched_class->put_prev_task(rq, prev);
+
schedstat_inc(rq, sched_goidle);
#ifdef CONFIG_SMP
/* Trigger the post schedule to do an idle_enter for CFS */
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