Commit-ID: 9a5d9ba6a3631d55c358fe1bdbaa162a97471a05 Gitweb: http://git.kernel.org/tip/9a5d9ba6a3631d55c358fe1bdbaa162a97471a05 Author: Peter Zijlstra <pet...@infradead.org> AuthorDate: Tue, 29 Jul 2014 17:15:11 +0200 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Tue, 12 Aug 2014 12:48:20 +0200
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 <r...@redhat.com> Signed-off-by: Peter Zijlstra <pet...@infradead.org> Acked-by: Vincent Guittot <vincent.guit...@linaro.org> Cc: Linus Torvalds <torva...@linux-foundation.org> Link: http://lkml.kernel.org/r/20140729152705.gx12...@laptop.lan Signed-off-by: Ingo Molnar <mi...@kernel.org> --- kernel/sched/fair.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 9437725..df1ed17 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -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); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
