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....@intel.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 f861427..0dd29f4 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5105,7 +5105,9 @@ 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->flags & LBF_POWER_BAL) && capacity && + rq->nr_running == 1 && wl > env->imbalance)) continue; /* @@ -5208,7 +5210,8 @@ redo: ld_moved = 0; lb_iterations = 1; - if (busiest->nr_running > 1) { + if (busiest->nr_running > 1 || + (busiest->nr_running == 1 && env.flags & LBF_POWER_BAL)) { /* * 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 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/