Commit 10447917 authored Mar 12, 2014 by Kirill V Tkhai Committed by Ingo Molnar Apr 18, 2014

sched/rt: Do not try to push tasks if pinned task switches to RT



Just switched pinned task is not able to be pushed. If the rq had had
several RT tasks before they have already been considered as candidates
to be pushed (or pulled).

Signed-off-by: Kirill V Tkhai <tkhai@yandex.ru>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20140312061833.3a43aa64@gandalf.local.home


Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 27e4f9d0

kernel/sched/rt.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -1892,9 +1892,9 @@ static void switched_to_rt(struct rq rq, struct task_struct p)
		*/
		if (p->on_rq && rq->curr != p) {
		#ifdef CONFIG_SMP
		if (rq->rt.overloaded && push_rt_task(rq) &&
		if (p->nr_cpus_allowed > 1 && rq->rt.overloaded &&
		/* Don't resched if we changed runqueues */
		rq != task_rq(p))
		push_rt_task(rq) && rq != task_rq(p))
		check_resched = 0;
		#endif /* CONFIG_SMP */
		if (check_resched && p->prio < rq->curr->prio)