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sched: arch_reinit_sched_domains() must destroy domains to force rebuild

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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>
This commit is contained in:
Max Krasnyansky
2008-08-29 13:11:41 -07:00
committed by Ingo Molnar
parent cf417141cb
commit dfb512ec48
2 changed files with 14 additions and 7 deletions
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2
include/linux/cpuset.h
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@@ -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 */