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sched/fair: Allow calculate_imbalance() to move idle cpus

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Allow calculate_imbalance() to 'create' idle cpus in the busiest group
if there are idle cpus in the local group.

Suggested-by: Rik van Riel <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Acked-by: Vincent Guittot <[email protected]>
Cc: Linus Torvalds <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Peter Zijlstra authored and Ingo Molnar committed 2014-08-12 12:48:20 +02:00
1 parent caeb178c60
commit 9a5d9ba6a3
1 file changed
+5 -6
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kernel/sched/fair.c
+5 -6
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@@ -6273,12 +6273,11 @@ static inline void calculate_imbalance(struct lb_env *env, struct sd_lb_stats *s
return fix_small_imbalance(env, sds);
}
if (busiest->group_type == group_overloaded) {
/*
* Don't want to pull so many tasks that a group would go idle.
* Except of course for the group_imb case, since then we might
* have to drop below capacity to reach cpu-load equilibrium.
*/
/*
* If there aren't any idle cpus, avoid creating some.
*/
if (busiest->group_type == group_overloaded &&
local->group_type == group_overloaded) {
load_above_capacity =
(busiest->sum_nr_running - busiest->group_capacity_factor);