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sched: do not wakeup-preempt with SCHED_BATCH tasks 

do not wakeup-preempt with SCHED_BATCH tasks, their preemption
is batched too, driven by the tick.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2007-10-15 17:00:18 +02:00
parent fb7dde37ec
commit 91c234b4e3
1 changed files with 6 additions and 0 deletions
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6
kernel/sched_fair.c
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@ -828,6 +828,12 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p)
resched_task(curr);
return;
}
/*
* Batch tasks do not preempt (their preemption is driven by
* the tick):
*/
if (unlikely(p->policy == SCHED_BATCH))
return;
if (sched_feat(WAKEUP_PREEMPT)) {
while (!is_same_group(se, pse)) {