Commit 777c2f38 authored Dec 29, 2008 by Gregory Haskins

sched: only try to push a task on wakeup if it is migratable



There is no sense in wasting time trying to push a task away that
cannot move anywhere else.  We gain no benefit from trying to push
other tasks at this point, so if the task being woken up is non
migratable, just skip the whole operation.  This reduces overhead
in the wakeup path for certain tasks.

Signed-off-by: Gregory Haskins <ghaskins@novell.com>

parent 74ab8e4f

kernel/sched_rt.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -1314,7 +1314,8 @@ static void task_wake_up_rt(struct rq rq, struct task_struct p)
		{
		if (!task_running(rq, p) &&
		!test_tsk_need_resched(rq->curr) &&
		rq->rt.overloaded)
		rq->rt.overloaded &&
		p->rt.nr_cpus_allowed > 1)
		push_rt_tasks(rq);
		}

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