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authorGautham R Shenoy <ego@in.ibm.com>2009-09-02 16:59:10 +0530
committerIngo Molnar <mingo@elte.hu>2009-09-04 10:09:56 +0200
commitd899a789c28ded9c72b57ddb61868d6b8fc23e80 (patch)
tree0b636ca14480093af22e64e09d1d72632d26fbd7 /kernel/sched.c
parentbdb94aa5dbd8b55e75f5a50b61312fe589e2c2d1 (diff)
downloadop-kernel-dev-d899a789c28ded9c72b57ddb61868d6b8fc23e80.zip
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sched: Try to deal with low capacity, fix update_sd_power_savings_stats()
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>
Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 5f5b359..e1ebf9b 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -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 ||
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