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>
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 @@
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 */