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Commit 0d13033b authored by Mike Galbraith's avatar Mike Galbraith Committed by Ingo Molnar
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sched: weaken sync hint 



Mysql+oltp and pgsql+oltp peaks are still shifted right. The below puts
the peaks back to 1 client/server pair per core.

Use the avg_overlap information to weaken the sync hint.

Signed-off-by: default avatarMike Galbraith <efault@gmx.de>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 1af5f730

kernel/sched_fair.c

+3 −4
Original line number Diff line number Diff line
@@ -1123,10 +1123,9 @@ wake_affine(struct sched_domain *this_sd, struct rq *this_rq, 
	if (!(this_sd->flags & SD_WAKE_AFFINE) || !sched_feat(AFFINE_WAKEUPS))

		return 0;



	if (!sync && sched_feat(SYNC_WAKEUPS) &&

	    curr->se.avg_overlap < sysctl_sched_migration_cost &&

	    p->se.avg_overlap < sysctl_sched_migration_cost)

		sync = 1;

	if (sync && (curr->se.avg_overlap > sysctl_sched_migration_cost ||

			p->se.avg_overlap > sysctl_sched_migration_cost))

		sync = 0;



	/*

	 * If sync wakeup then subtract the (maximum possible)