sched: wakeup preemption fix

wakeup preemption fix: do not make it dependent on p->prio.
Preemption purely depends on ->vruntime.

This improves preemption in mixed-nice-level workloads.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index fbcb426..a3badf5 100644 (file)
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -863,10 +863,8 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p)
                if (unlikely(se->load.weight != NICE_0_LOAD))
                        gran = calc_delta_fair(gran, &se->load);
 
-               if (delta > gran) {
-                       if (p->prio < curr->prio)
-                               resched_task(curr);
-               }
+               if (delta > gran)
+                       resched_task(curr);
        }
 }