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Commit 9c63d9c0 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

sched: sync wakeups preempt too 



make sure sync wakeups preempt too - the scheduler will not
overschedule as we've got various throttles against that.
As a result, sync wakeups can be used more widely in the kernel
(to signal wakeup affinity between tasks), and no arbitrary
latencies will be introduced either.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 71e20f18

kernel/sched.c

+1 −10
Original line number Diff line number Diff line
@@ -1596,15 +1596,6 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync) 
		schedstat_inc(p, se.nr_wakeups_remote);

	update_rq_clock(rq);

	activate_task(rq, p, 1);

	/*

	 * Sync wakeups (i.e. those types of wakeups where the waker

	 * has indicated that it will leave the CPU in short order)

	 * don't trigger a preemption, if the woken up task will run on

	 * this cpu. (in this case the 'I will reschedule' promise of

	 * the waker guarantees that the freshly woken up task is going

	 * to be considered on this CPU.)

	 */

	if (!sync || rq->curr == rq->idle)

	check_preempt_curr(rq, p);

	success = 1;