sched/fair: Allow calculate_imbalance() to move idle cpus
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 <riel@redhat.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Vincent Guittot <vincent.guittot@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/20140729152705.GX12054@laptop.lan Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -6273,12 +6273,11 @@ static inline void calculate_imbalance(struct lb_env *env, struct sd_lb_stats *s
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return fix_small_imbalance(env, sds);
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}
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if (busiest->group_type == group_overloaded) {
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/*
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* Don't want to pull so many tasks that a group would go idle.
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* Except of course for the group_imb case, since then we might
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* have to drop below capacity to reach cpu-load equilibrium.
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* If there aren't any idle cpus, avoid creating some.
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*/
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if (busiest->group_type == group_overloaded &&
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local->group_type == group_overloaded) {
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load_above_capacity =
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(busiest->sum_nr_running - busiest->group_capacity_factor);
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