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Date: Thu, 24 Jan 2013 11:06:57 +0800 From: Alex Shi <alex.shi@...el.com> To: torvalds@...ux-foundation.org, mingo@...hat.com, peterz@...radead.org, tglx@...utronix.de, akpm@...ux-foundation.org, arjan@...ux.intel.com, bp@...en8.de, pjt@...gle.com, namhyung@...nel.org, efault@....de Cc: vincent.guittot@...aro.org, gregkh@...uxfoundation.org, preeti@...ux.vnet.ibm.com, viresh.kumar@...aro.org, linux-kernel@...r.kernel.org, alex.shi@...el.com Subject: [patch v4 15/18] sched: pull all tasks from source group In power balance, we hope some sched groups are fully empty to save CPU power of them. So, we want to move any tasks from them. Signed-off-by: Alex Shi <alex.shi@...el.com> --- kernel/sched/fair.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 19624f4..a1ccb40 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5110,7 +5110,9 @@ static struct rq *find_busiest_queue(struct lb_env *env, * When comparing with imbalance, use weighted_cpuload() * which is not scaled with the cpu power. */ - if (capacity && rq->nr_running == 1 && wl > env->imbalance) + if (rq->nr_running == 0 || + (!env->power_lb && capacity && + rq->nr_running == 1 && wl > env->imbalance)) continue; /* @@ -5214,7 +5216,8 @@ redo: ld_moved = 0; lb_iterations = 1; - if (busiest->nr_running > 1) { + if (busiest->nr_running > 1 || + (busiest->nr_running == 1 && env.power_lb)) { /* * Attempt to move tasks. If find_busiest_group has found * an imbalance but busiest->nr_running <= 1, the group is -- 1.7.12 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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