Commit a7bc0926 authored Nov 26, 2014 by Olav Haugan

sched: Avoid migrating tasks to little cores due to EA



If during the check whether migration is needed we find that there is a
lower power CPU available we commence to find a new CPU for this task.
However, by the time we search for a new CPU the lower power CPU might
no longer be available. We should abort the attempt to migrate a task in
this case.

CRs-Fixed: 764788
Change-Id: I867923a82b95c599278b81cd73bb102b6aff4d03
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>

parent 2c320f2f

kernel/sched/fair.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -1860,6 +1860,10 @@ static int skip_cpu(struct task_struct *p, int cpu, int reason)
		skip = (rq->capacity >= task_rq->capacity);
		break;

		case MOVE_TO_POWER_EFFICIENT_CPU:
		skip = rq->capacity < task_rq->capacity \|\|
		power_cost(p, cpu) > power_cost(p, task_cpu(p));
		break;
		default:
		skip = (cpu == task_cpu(p));
		break;