sched: rt-group: reduce rescheduling

Only reschedule if the new group has a higher prio task.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 1 deletions

diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 8bfdb3f8a52d..f1f215db3bd0 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -94,8 +94,11 @@ static void sched_rt_ratio_enqueue(struct rt_rq *rt_rq)
         struct sched_rt_entity *rt_se = rt_rq->rt_se;
 
         if (rt_se && !on_rt_rq(rt_se) && rt_rq->rt_nr_running) {
+                struct task_struct *curr = rq_of_rt_rq(rt_rq)->curr;
+
                 enqueue_rt_entity(rt_se);
-                resched_task(rq_of_rt_rq(rt_rq)->curr);
+                if (rt_rq->highest_prio < curr->prio)
+                        resched_task(curr);
         }
 }