linux-kernel - [111/115] sched: Fix volanomark performance regression

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Message-Id: <20110216014705.349177479@clark.kroah.org>
Date:	Tue, 15 Feb 2011 17:46:17 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Mike Galbraith <efault@....de>, Nikhil Rao <ncrao@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>
Subject: [111/115] sched: Fix volanomark performance regression

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------

Commit: b5482cfa1c95a188b3054fa33274806add91bbe5 upstream

Commit fab4762 triggers excessive idle balancing, causing a ~30% loss in
volanomark throughput. Remove idle balancing throttle reset.

Originally-by: Alex Shi <alex.shi@...el.com>
Signed-off-by: Mike Galbraith <efault@....de>
Acked-by: Nikhil Rao <ncrao@...gle.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <1289928732.5169.211.camel@...gy.simson.net>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Mike Galbraith <efault@....de>
Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 kernel/sched.c |    4 ----
 1 file changed, 4 deletions(-)

--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3326,10 +3326,6 @@ static void pull_task(struct rq *src_rq,
 	set_task_cpu(p, this_cpu);
 	activate_task(this_rq, p, 0);
 	check_preempt_curr(this_rq, p, 0);
-
-	/* re-arm NEWIDLE balancing when moving tasks */
-	src_rq->avg_idle = this_rq->avg_idle = 2*sysctl_sched_migration_cost;
-	this_rq->idle_stamp = 0;
 }
 
 /*


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