From: Kirill V Tkhai Date: Wed, 12 Mar 2014 10:18:33 +0000 (-0400) Subject: sched/rt: Do not try to push tasks if pinned task switches to RT X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=10447917551e0fffb8d1892d46e633c3e0a9c1ec;p=deliverable%2Flinux.git 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 Acked-by: Steven Rostedt Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/20140312061833.3a43aa64@gandalf.local.home Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar --- diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index bd2267ad404f..1e4992eb5166 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -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)