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Commit cea49887 authored by Srivatsa Vaddagiri's avatar Srivatsa Vaddagiri Committed by Steve Muckle
Browse files

sched: avoid active migration of tasks not in TASK_RUNNING state 



Avoid wasting effort in migrating tasks that are about to sleep.

Change-Id: Icf9520b1c8fa48d3e071cb9fa1c5526b3b36ff16
Signed-off-by: default avatarSrivatsa Vaddagiri <vatsa@codeaurora.org>
parent 955b16f3

kernel/sched/fair.c

+3 −2
Original line number Diff line number Diff line
@@ -1953,7 +1953,7 @@ static inline int migration_needed(struct rq *rq, struct task_struct *p) 
{

	int nice = TASK_NICE(p);



	if (is_small_task(p))

	if (is_small_task(p) || p->state != TASK_RUNNING)

		return 0;



	/* Todo: cgroup-based control? */
@@ -6548,7 +6548,8 @@ static int active_load_balance_cpu_stop(void *data) 


	push_task = busiest_rq->push_task;

	if (push_task) {

		if (push_task->on_rq && task_cpu(push_task) == busiest_cpu &&

		if (push_task->on_rq && push_task->state == TASK_RUNNING &&

		    task_cpu(push_task) == busiest_cpu &&

		    cpu_online(target_cpu))

			move_task(push_task, &env);

		put_task_struct(push_task);