From 284c30559c3ef7e79ff91fbceda238a3f1fd82ec Mon Sep 17 00:00:00 2001 From: Kirill V Tkhai Date: Wed, 12 Mar 2014 06:18:33 -0400 Subject: [PATCH] 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 --- kernel/sched/rt.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index bd2267ad404fa..1e4992eb5166f 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) -- 2.39.5