linux-kernel - [tip:sched/urgent] sched: Select_task_rq_fair() must honour SD_LOAD

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Message-ID: <tip-e4f4288842ee12747e10c354d72be7d424c0b627@git.kernel.org>
Date:	Wed, 16 Dec 2009 18:37:21 GMT
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, efault@....de, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:sched/urgent] sched: Select_task_rq_fair() must honour SD_LOAD_BALANCE

Commit-ID:  e4f4288842ee12747e10c354d72be7d424c0b627
Gitweb:     http://git.kernel.org/tip/e4f4288842ee12747e10c354d72be7d424c0b627
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Wed, 16 Dec 2009 18:04:34 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 16 Dec 2009 19:01:55 +0100

sched: Select_task_rq_fair() must honour SD_LOAD_BALANCE

We should skip !SD_LOAD_BALANCE domains.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Mike Galbraith <efault@....de>
LKML-Reference: <20091216170517.653578430@...llo.nl>
CC: stable@...nel.org
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched_fair.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 5bedf6e..ec1d271 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1429,6 +1429,9 @@ static int select_task_rq_fair(struct task_struct *p, int sd_flag, int wake_flag
 	}
 
 	for_each_domain(cpu, tmp) {
+		if (!(tmp->flags & SD_LOAD_BALANCE))
+			continue;
+
 		/*
 		 * If power savings logic is enabled for a domain, see if we
 		 * are not overloaded, if so, don't balance wider.
--
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