Commit 6ee025c0 authored May 17, 2017 by Joonwoo Park

sched: don't active migrate tasks to CPUs in the same cluster



energy_aware_wake_cpu() can choose a CPU other than previous CPU for
reasons.  When it's used at energy_aware_wake_cpu(), we have to avoid
unwanted active migration within the same cluster and allow only
inter cluster upmigration.

Check with CPU's capacity and allow inter cluster upmigration only.

Change-Id: I6a1378ed39601078590e300d065f33fe6a81b178
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>

parent 77a47ccc

kernel/sched/fair.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -12319,7 +12319,7 @@ void check_for_migration(struct rq rq, struct task_struct p)
		return;

		new_cpu = energy_aware_wake_cpu(p, cpu, 0);
		if (new_cpu != cpu) {
		if (capacity_orig_of(new_cpu) > capacity_orig_of(cpu)) {
		active_balance = kick_active_balance(rq, p, new_cpu);
		if (active_balance) {
		mark_reserved(new_cpu);