tree 0a6213fa99f27404f07e2e38f29ce93ae9bbf588
parent 98a96f202203fecad65b44449077c695686ad4db
author Peter Zijlstra <peterz@infradead.org> 1406646021 +0200
committer Ingo Molnar <mingo@kernel.org> 1407840498 +0200

sched/fair: Make calculate_imbalance() independent

Rik noticed that calculate_imbalance() relies on
update_sd_pick_busiest() to guarantee that busiest->sum_nr_running >
busiest->group_capacity_factor.

Break this implicit assumption (with the intent of not providing it
anymore) by having calculat_imbalance() verify it and not rely on
others.

Reported-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>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/20140729152631.GW12054@laptop.lan
Signed-off-by: Ingo Molnar <mingo@kernel.org>