From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 14 Mar 2008 21:16:08 +0000 (+0100)
Subject: sched: fix fair sleepers
X-Git-Tag: v2.6.25-rc6~6
X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=e22ecef1d2658ba54ed7d3fdb5d60829fb434c23;p=linux-2.6-omap-h63xx.git

sched: fix fair sleepers

Fair sleepers need to scale their latency target down by runqueue
weight. Otherwise busy systems will gain ever larger sleep bonus.

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

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 31c4a2988b6..31aa1b9fa76 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -528,8 +528,10 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
 
 	if (!initial) {
 		/* sleeps upto a single latency don't count. */
-		if (sched_feat(NEW_FAIR_SLEEPERS))
-			vruntime -= sysctl_sched_latency;
+		if (sched_feat(NEW_FAIR_SLEEPERS)) {
+			vruntime -= calc_delta_fair(sysctl_sched_latency,
+						    &cfs_rq->load);
+		}
 
 		/* ensure we never gain time by being placed backwards. */
 		vruntime = max_vruntime(se->vruntime, vruntime);