sched/deadline: Reschedule from switched_from_dl() after a successful pull

In switched_from_dl() we have to issue a resched if we successfully
pulled some task from other cpus. This patch also aligns the behavior
with -rt.

Suggested-by: Juri Lelli <[email protected]>
Signed-off-by: Wanpeng Li <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Kirill Tkhai <[email protected]>
Cc: Linus Torvalds <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index e7779b3feec4c1fec1e5cb763b8606bccb000a6a..362ab1f886b079df1975225a74837ac843239239 100644 (file)
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1643,8 +1643,11 @@ static void switched_from_dl(struct rq *rq, struct task_struct *p)
         * this is the right place to try to pull some other one
         * from an overloaded cpu, if any.
         */
-       if (!rq->dl.dl_nr_running)
-               pull_dl_task(rq);
+       if (!task_on_rq_queued(p) || rq->dl.dl_nr_running)
+               return;
+
+       if (pull_dl_task(rq))
+               resched_curr(rq);
 #endif
 }