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sched: Push put_prev_task() into pick_next_task()

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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>
This commit is contained in:
Peter Zijlstra
2012-02-11 06:05:00 +01:00
committed by Ingo Molnar
parent fed14d45f9
commit 606dba2e28
7 changed files with 55 additions and 34 deletions
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5
kernel/sched/deadline.c
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@@ -990,7 +990,7 @@ static struct sched_dl_entity *pick_next_dl_entity(struct rq *rq,
return rb_entry(left, struct sched_dl_entity, rb_node);
}
struct task_struct *pick_next_task_dl(struct rq *rq)
struct task_struct *pick_next_task_dl(struct rq *rq, struct task_struct *prev)
{
struct sched_dl_entity *dl_se;
struct task_struct *p;
@@ -1001,6 +1001,9 @@ struct task_struct *pick_next_task_dl(struct rq *rq)
if (unlikely(!dl_rq->dl_nr_running))
return NULL;
if (prev)
prev->sched_class->put_prev_task(rq, prev);
dl_se = pick_next_dl_entity(rq, dl_rq);
BUG_ON(!dl_se);