linux-kernel - [tip:sched/urgent] sched: Fix sched_mv_power

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Date:	Tue, 16 Feb 2010 14:15:43 GMT
From:	tip-bot for Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	svaidy@...ux.vnet.ibm.com
Subject: [tip:sched/urgent] sched: Fix sched_mv_power_savings for !SMT

Commit-ID:  28f5318167adf23b16c844b9c2253f355cb21796
Gitweb:     http://git.kernel.org/tip/28f5318167adf23b16c844b9c2253f355cb21796
Author:     Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
AuthorDate: Mon, 8 Feb 2010 15:35:55 +0530
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 16 Feb 2010 15:13:59 +0100

sched: Fix sched_mv_power_savings for !SMT

Fix for sched_mc_powersavigs for pre-Nehalem platforms.
Child sched domain should clear SD_PREFER_SIBLING if parent will have
SD_POWERSAVINGS_BALANCE because they are contradicting.

Sets the flags correctly based on sched_mc_power_savings.

Signed-off-by: Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <20100208100555.GD2931@...shya.in.ibm.com>
Cc: stable@...nel.org [2.6.32.x]
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 include/linux/sched.h |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 78efe7c..1f5fa53 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -878,7 +878,10 @@ static inline int sd_balance_for_mc_power(void)
 	if (sched_smt_power_savings)
 		return SD_POWERSAVINGS_BALANCE;
 
-	return SD_PREFER_SIBLING;
+	if (!sched_mc_power_savings)
+		return SD_PREFER_SIBLING;
+
+	return 0;
 }
 
 static inline int sd_balance_for_package_power(void)
--
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