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sched: weaken sync hint

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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: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mike Galbraith 2008-10-24 11:06:14 +02:00 committed by Ingo Molnar
parent 1af5f730fc
commit 0d13033bc9
1 changed files with 3 additions and 4 deletions
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7
kernel/sched_fair.c
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@ -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)) if (!(this_sd->flags & SD_WAKE_AFFINE) || !sched_feat(AFFINE_WAKEUPS))
return 0; return 0;
if (!sync && sched_feat(SYNC_WAKEUPS) && if (sync && (curr->se.avg_overlap > sysctl_sched_migration_cost ||
curr->se.avg_overlap < sysctl_sched_migration_cost && p->se.avg_overlap > sysctl_sched_migration_cost))
p->se.avg_overlap < sysctl_sched_migration_cost) sync = 0;
sync = 1;
/* /*
* If sync wakeup then subtract the (maximum possible) * If sync wakeup then subtract the (maximum possible)