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Commit 20017f33 authored by Runmin Wang's avatar Runmin Wang
Browse files

sched/fair: Only kick nohz balance when runqueue has more than 1 task 



Misfit task will go through active migration path so there is no need
to check in the nohz balance case.

Change-Id: Ic05035d8c745797c4a5cbe52b7cdbd98edb352f3
Signed-off-by: default avatarRunmin Wang <runminw@codeaurora.org>
parent f95967f7

kernel/sched/fair.c

+5 −2
Original line number Diff line number Diff line
@@ -11209,13 +11209,16 @@ static inline bool nohz_kick_needed(struct rq *rq, bool only_update) 
	if (time_before(now, nohz.next_balance))

		return false;



	/*

	 * If energy aware is enabled, do idle load balance if runqueue has

	 * at least 2 tasks and cpu is overutilized

	 */

	if (rq->nr_running >= 2 &&

	    (!energy_aware() || cpu_overutilized(cpu)))

		return true;



	/* Do idle load balance if there have misfit task */

	if (energy_aware())

		return rq_has_misfit(rq);

		return false;



	rcu_read_lock();

	sds = rcu_dereference(per_cpu(sd_llc_shared, cpu));