| Date | Fri, 12 Mar 2010 16:27:55 -0800 | From | Greg KH <> | Subject | [142/145] sched: Fix sched_mv_power_savings for !SMT |
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2.6.32-stable review patch. If anyone has any objections, please let me know.
---------------- From: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
commit 28f5318167adf23b16c844b9c2253f355cb21796 upstream.
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> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- include/linux/sched.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
--- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -864,7 +864,10 @@ static inline int sd_balance_for_mc_powe 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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