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sched: Try to deal with low capacity, fix update_sd_power_savings_stats()

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sgs.group_capacity can now be 0, if for some reason
group->__cpu_power happens to be less than SCHED_LOAD_SCALE/2.

In that case, we need the following fix to make it work for
update_sd_power_savings_stats(). That's because both
sum_nr_running and group_capacity are unsigned longs.

Cc: Gautham R Shenoy <ego@in.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andreas Herrmann <andreas.herrmann3@amd.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Gautham R Shenoy 2009-09-02 16:59:10 +05:30 committed by Ingo Molnar
parent bdb94aa5db
commit d899a789c2
1 changed files with 1 additions and 1 deletions
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2
kernel/sched.c
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@ -3668,7 +3668,7 @@ static inline void update_sd_power_savings_stats(struct sched_group *group,
* capacity but still has some space to pick up some load
* from other group and save more power
*/
if (sgs->sum_nr_running > sgs->group_capacity - 1)
if (sgs->sum_nr_running + 1 > sgs->group_capacity)
return;
if (sgs->sum_nr_running > sds->leader_nr_running ||