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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@linux.vnet.ibm.com>
AuthorDate: Mon, 8 Feb 2010 15:35:55 +0530
Committer: Thomas Gleixner <tglx@linutronix.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@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20100208100555.GD2931@dirshya.in.ibm.com>
Cc: stable@kernel.org [2.6.32.x]
Signed-off-by: Thomas Gleixner <tglx@linutronix.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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