linux-kernel - [PATCH 26/28] sched: Fix volanomark performance regression

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Date:	Thu, 10 Feb 2011 10:23:29 +0100
From:	stable-bot for Alex Shi <alex.shi@...el.com>
To:	stable@...nel.org
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>
Subject: [PATCH 26/28] sched: Fix volanomark performance regression

Commit: b5482cfa1c95a188b3054fa33274806add91bbe5 upstream
Author: Alex Shi <alex.shi@...el.com>
AuthorDate: Tue Nov 16 17:34:02 2010 +0800

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>
---
 kernel/sched.c |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 445f2d1..ffd4f57 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3326,10 +3326,6 @@ static void pull_task(struct rq *src_rq, struct task_struct *p,
 	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;
 }
 
 /*
-- 
1.7.4


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