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sched: re-do "sched: fix fair sleepers"

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re-apply:

| commit e22ecef1d2
| Author: Ingo Molnar <mingo@elte.hu>
| Date:   Fri Mar 14 22:16:08 2008 +0100
|
|     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>
This commit is contained in:
Ingo Molnar 2008-04-14 08:53:32 +02:00
parent 3925e6fc1f
commit 018d6db4cb
1 changed files with 4 additions and 2 deletions
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6
kernel/sched_fair.c
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@ -510,8 +510,10 @@ 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);