From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Fri, 25 Jan 2008 20:08:32 +0000 (+0100)
Subject: sched: rt-group: reduce rescheduling
X-Git-Tag: v2.6.25-rc1~1237^2~18
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1020387f5f3b52929b387103cf976321981f8e26;p=linux-2.6

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>
---

diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 8bfdb3f8a5..f1f215db3b 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);
 	}
 }