linux-kernel - [PATCH 27/28] sched: Fix idle balancing

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Message-ID: <1297340644.5512.27.camel@marge.simson.net>
Date:	Thu, 10 Feb 2011 10:23:29 +0100
From:	stable-bot for Nikhil Rao <ncrao@...gle.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 27/28] sched: Fix idle balancing

Commit: d5ad140bc1505a98c0f040937125bfcbb508078f upstream
Author: Nikhil Rao <ncrao@...gle.com>
AuthorDate: Wed Nov 17 11:42:04 2010 -0800

An earlier commit reverts idle balancing throttling reset to fix a 30%
regression in volanomark throughput. We still need to reset idle_stamp
when we pull a task in newidle balance.

Reported-by: Alex Shi <alex.shi@...el.com>
Signed-off-by: Nikhil Rao <ncrao@...gle.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <1290022924-3548-1-git-send-email-ncrao@...gle.com>
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, 3 insertions(+), 1 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index ffd4f57..f4e1f4e 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4692,8 +4692,10 @@ static void idle_balance(int this_cpu, struct rq *this_rq)
 		interval = msecs_to_jiffies(sd->balance_interval);
 		if (time_after(next_balance, sd->last_balance + interval))
 			next_balance = sd->last_balance + interval;
-		if (pulled_task)
+		if (pulled_task) {
+			this_rq->idle_stamp = 0;
 			break;
+		}
 	}
 	if (pulled_task || time_after(jiffies, this_rq->next_balance)) {
 		/*
-- 
1.7.4


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