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Commit fcff1228 authored by Maria Yu's avatar Maria Yu Committed by Cong Zhang
Browse files

sched/fair: Allow load bigger task load balance when nr_running is 2 



When there is only 2 tasks in 1 cpu and the other
task is currently running, allow load bigger task
to be balanced if the other task is currently
running.

Change-Id: I489e9624ba010f9293272a67585e8209a786b787
Signed-off-by: default avatarMaria Yu <aiquny@codeaurora.org>
Signed-off-by: default avatarCong Zhang <congzhan@codeaurora.org>
parent 6b3ddc57

kernel/sched/fair.c

+11 −1
Original line number Diff line number Diff line
@@ -8675,7 +8675,17 @@ 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)

		/*

		 * p is not running task when we goes until here, so if p is one

		 * of the 2 task in src cpu rq and not the running one,

		 * that means it is the only task that can be balanced.

		 * So only when there is other tasks can be balanced or

		 * there is situation to ignore big task, it is needed

		 * to skip the task load bigger than 2*imbalance.

		 */

		if (((cpu_rq(env->src_cpu)->nr_running > 2) ||

			(env->flags & LBF_IGNORE_BIG_TASKS)) &&

			((load / 2) > env->imbalance))

			goto next;



		detach_task(p, env);