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Commit 91c234b4 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

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: default avatarIngo Molnar <mingo@elte.hu>
parent fb7dde37

kernel/sched_fair.c

+6 −0
Original line number Diff line number Diff line
@@ -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)) {