Messages in this thread Patch in this message | | | From | Uladzislau Rezki <> | Subject | [RFC 3/3] sched: ignore task_h_load for CPU_NEWLY_IDLE | Date | Mon, 2 Jan 2017 16:39:48 +0100 |
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From: Uladzislau 2 Rezki <uladzislau2.rezki@sonymobile.com>
A load balancer calculates imbalance factor for particular shed domain and tries to steal up the prescribed amount of weighted load. However, a small imbalance factor would sometimes prevent us from stealing any tasks at all. When a CPU is newly idle, it should steal first task which passes a migration criteria.
Signed-off-by: Uladzislau 2 Rezki <uladzislau2.rezki@sonymobile.com> --- kernel/sched/fair.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 9ebcab1..00b63cc 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -6534,8 +6534,9 @@ static int detach_tasks(struct lb_env *env) if (sched_feat(LB_MIN) && load < 16 && !env->sd->nr_balance_failed) goto next; - if ((load / 2) > env->imbalance) - goto next; + if (env->idle != CPU_NEWLY_IDLE) + if ((load / 2) > env->imbalance) + goto next; detach_task(p, env); list_add(&p->se.group_node, &env->tasks); -- 2.1.4
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