From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Mon, 15 Oct 2007 15:00:14 +0000 (+0200)
Subject: sched: disable sleeper_fairness on SCHED_BATCH
X-Git-Tag: v2.6.24-rc1~1289^2~35
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=8ca0e14ffb12c257de591571a9e96102acdb1c64;p=linux.git

sched: disable sleeper_fairness on SCHED_BATCH

disable sleeper fairness for batch tasks - they are about
batch processing after all.

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

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 3ecbfd0902d8..410b77aea216 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -485,7 +485,9 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
 		vruntime += sched_vslice_add(cfs_rq, se);
 
 	if (!initial) {
-		if (sched_feat(NEW_FAIR_SLEEPERS))
+		struct task_struct *p = container_of(se, struct task_struct, se);
+
+		if (sched_feat(NEW_FAIR_SLEEPERS) && p->policy != SCHED_BATCH)
 			vruntime -= sysctl_sched_latency;
 
 		vruntime = max_t(s64, vruntime, se->vruntime);