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Commit 43003157 authored by Joonwoo Park's avatar Joonwoo Park
Browse files

sched: bias towards prev CPU when it's one of idle CPUs 



Bias towards prev CPU when it's one of idle CPUs to reduce migrations
and cache bouncing.

Change-Id: I81920ed1450b1c3831f93405a6993807fb262a5b
Signed-off-by: default avatarJoonwoo Park <joonwoop@codeaurora.org>
parent 12084a13

kernel/sched/fair.c

+7 −3
Original line number Diff line number Diff line
@@ -6713,9 +6713,13 @@ static int energy_aware_wake_cpu(struct task_struct *p, int target, int sync) 
				min_util_cpu_util_cum = new_util_cum;

			} else if (sysctl_sched_cstate_aware &&

				   min_util == new_util) {

				if (cpu_idle_idx < min_util_cpu_idle_idx ||

				if (min_util_cpu == task_cpu(p))

					continue;



				if (i == task_cpu(p) ||

				    (cpu_idle_idx < min_util_cpu_idle_idx ||

				     (cpu_idle_idx == min_util_cpu_idle_idx &&

				     min_util_cpu_util_cum > new_util_cum)) {

				      min_util_cpu_util_cum > new_util_cum))) {

					min_util_cpu = i;

					min_util_cpu_idle_idx = cpu_idle_idx;

					min_util_cpu_util_cum = new_util_cum;