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authorMax Krasnyansky <maxk@qualcomm.com>2008-08-29 13:11:41 -0700
committerIngo Molnar <mingo@elte.hu>2008-09-06 19:22:15 +0200
commitdfb512ec4834116124da61d6c1ee10fd0aa32bd6 (patch)
treeea4f847f2a29face1b5774c6d44ec41bf92e302b /include
parentcf417141cbb3a4ceb5cca15b2c1f099bd0a6603c (diff)
sched: arch_reinit_sched_domains() must destroy domains to force rebuild
What I realized recently is that calling rebuild_sched_domains() in arch_reinit_sched_domains() by itself is not enough when cpusets are enabled. partition_sched_domains() code is trying to avoid unnecessary domain rebuilds and will not actually rebuild anything if new domain masks match the old ones. What this means is that doing echo 1 > /sys/devices/system/cpu/sched_mc_power_savings on a system with cpusets enabled will not take affect untill something changes in the cpuset setup (ie new sets created or deleted). This patch fixes restore correct behaviour where domains must be rebuilt in order to enable MC powersaving flags. Test on quad-core Core2 box with both CONFIG_CPUSETS and !CONFIG_CPUSETS. Also tested on dual-core Core2 laptop. Lockdep is happy and things are working as expected. Signed-off-by: Max Krasnyansky <maxk@qualcomm.com> Tested-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include')
-rw-r--r--include/linux/cpuset.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h
index e8f450c499b..2691926fb50 100644
--- a/include/linux/cpuset.h
+++ b/include/linux/cpuset.h
@@ -160,7 +160,7 @@ static inline int current_cpuset_is_being_rebound(void)
static inline void rebuild_sched_domains(void)
{
- partition_sched_domains(0, NULL, NULL);
+ partition_sched_domains(1, NULL, NULL);
}
#endif /* !CONFIG_CPUSETS */