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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2008-01-31 22:45:22 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-31 22:45:22 +0100
commitef9884e6f29bbe1075204f962a00f7533bf7e8f3 (patch)
tree6d67c6a7073ec99237336c32a8d6985d5b8a2f4e /kernel
parent296825cbe14d4c95ee9c41ca5824f7487bfb4d9d (diff)
downloadop-kernel-dev-ef9884e6f29bbe1075204f962a00f7533bf7e8f3.zip
op-kernel-dev-ef9884e6f29bbe1075204f962a00f7533bf7e8f3.tar.gz
sched: let +nice tasks have smaller impact
Michel Dänzr has bisected an interactivity problem with plus-reniced tasks back to this commit: 810e95ccd58d91369191aa4ecc9e6d4a10d8d0c8 is first bad commit commit 810e95ccd58d91369191aa4ecc9e6d4a10d8d0c8 Author: Peter Zijlstra <a.p.zijlstra@chello.nl> Date: Mon Oct 15 17:00:14 2007 +0200 sched: another wakeup_granularity fix unit mis-match: wakeup_gran was used against a vruntime fix this by assymetrically scaling the vtime of positive reniced tasks. Bisected-by: Michel Dänzer <michel@tungstengraphics.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched_fair.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index cf958aef..6c091d6 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1106,7 +1106,11 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p)
}
gran = sysctl_sched_wakeup_granularity;
- if (unlikely(se->load.weight != NICE_0_LOAD))
+ /*
+ * More easily preempt - nice tasks, while not making
+ * it harder for + nice tasks.
+ */
+ if (unlikely(se->load.weight > NICE_0_LOAD))
gran = calc_delta_fair(gran, &se->load);
if (pse->vruntime + gran < se->vruntime)
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