diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2014-07-29 17:15:11 +0200 |
|---|---|---|
| committer | Robin Randhawa <robin.randhawa@arm.com> | 2015-04-09 12:26:08 +0100 |
| commit | e7fab1070652bdbd41cb247a986cb3bf70244df1 (patch) | |
| tree | 716ea6d6c576d9b8481e7d639d3c30296986120c /kernel/sched/fair.c | |
| parent | 0ba93048baf74563883a828b3474dab694049f7d (diff) | |
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>
(cherry picked from commit 9a5d9ba6a3631d55c358fe1bdbaa162a97471a05)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
Diffstat (limited to 'kernel/sched/fair.c')
| -rw-r--r-- | kernel/sched/fair.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index e78788a922f2..20ce23072013 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5039,12 +5039,11 @@ 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); |