From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: linux-kernel@vger.kernel.org
Cc: mingo@elte.hu, efault@gmx.de, vatsa@in.ibm.com,
Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: [PATCH 3/8] sched: weaken sync hint
Date: Fri, 24 Oct 2008 11:06:14 +0200 [thread overview]
Message-ID: <20081024091109.585167877@chello.nl> (raw)
In-Reply-To: 20081024090611.936552213@chello.nl
[-- Attachment #1: mike-weaken-sync.patch --]
[-- Type: text/plain, Size: 1116 bytes --]
From: Mike Galbraith <efault@gmx.de>
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>
---
kernel/sched_fair.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
Index: linux-2.6/kernel/sched_fair.c
===================================================================
--- linux-2.6.orig/kernel/sched_fair.c
+++ linux-2.6/kernel/sched_fair.c
@@ -1228,10 +1228,9 @@ wake_affine(struct sched_domain *this_sd
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)
--
next prev parent reply other threads:[~2008-10-24 9:59 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-24 9:06 [PATCH 0/8] scheduler patches Peter Zijlstra
2008-10-24 9:06 ` [PATCH 1/8] sched: fix a find_busiest_group buglet Peter Zijlstra
2008-10-24 9:06 ` [PATCH 2/8] sched: more accurate min_vruntime accounting Peter Zijlstra
2008-10-24 9:06 ` Peter Zijlstra [this message]
2008-10-24 9:06 ` [PATCH 4/8] sched: re-instate vruntime based wakeup preemption Peter Zijlstra
2008-10-24 9:06 ` [PATCH 5/8] sched: virtual time buddy preemption Peter Zijlstra
2008-10-24 9:06 ` [PATCH 6/8] sched: avg_vruntime Peter Zijlstra
2008-10-29 15:48 ` Peter Zijlstra
2008-11-01 18:13 ` Fabio Checconi
2008-10-24 9:06 ` [PATCH 7/8] sched: non-zero lag renice Peter Zijlstra
2008-10-24 17:47 ` Chris Friesen
2008-10-24 20:28 ` Peter Zijlstra
2008-10-24 21:13 ` Chris Friesen
2008-10-24 9:06 ` [PATCH 8/8] use avg_vruntime for task placement Peter Zijlstra
2008-10-24 10:26 ` [PATCH 0/8] scheduler patches Ingo Molnar
2008-10-24 10:29 ` Peter Zijlstra
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