sched: fix fair preempt check
Peter Zijlstra [Tue, 4 Nov 2008 20:25:08 +0000 (21:25 +0100)]
Impact: fix cross-class preemption

Inter-class wakeup preemptions should go on class order.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

kernel/sched_fair.c

index 6167336..ebd6de8 100644 (file)
@@ -1329,6 +1329,9 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int sync)
                return;
        }
 
+       if (unlikely(p->sched_class != &fair_sched_class))
+               return;
+
        if (unlikely(se == pse))
                return;