From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 9 Nov 2007 21:39:39 +0000 (+0100)
Subject: sched: wakeup preemption fix
X-Git-Tag: v2.6.24-rc3~170^2~5
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8bc6767acb3236e0345e99cf198168e60e7ae456;p=linux-2.6

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 fbcb426029..a3badf52bb 100644
--- 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);
 	}
 }