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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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16
kernel/sched/stop_task.c
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@ -23,16 +23,20 @@ check_preempt_curr_stop(struct rq *rq, struct task_struct *p, int flags)
/* we're never preempted */
}
static struct task_struct *pick_next_task_stop(struct rq *rq)
static struct task_struct *
pick_next_task_stop(struct rq *rq, struct task_struct *prev)
{
struct task_struct *stop = rq->stop;
if (stop && stop->on_rq) {
stop->se.exec_start = rq_clock_task(rq);
return stop;
}
if (!stop || !stop->on_rq)
return NULL;
return NULL;
if (prev)
prev->sched_class->put_prev_task(rq, prev);
stop->se.exec_start = rq_clock_task(rq);
return stop;
}
static void