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sched: add tree based averages

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add support for tree based vruntime averages.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Peter Zijlstra
2007-10-15 17:00:05 +02:00
committed by Ingo Molnar
parent 28a1f6fa2f
commit 94dfb5e75e
2 changed files with 18 additions and 8 deletions
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20
kernel/sched_fair.c
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@@ -547,16 +547,22 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
static void
place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
{
struct sched_entity *last = __pick_last_entity(cfs_rq);
u64 min_runtime, latency;
min_runtime = cfs_rq->min_vruntime;
if (last) {
min_runtime += last->vruntime;
min_runtime >>= 1;
if (initial && sched_feat(START_DEBIT))
min_runtime += sysctl_sched_latency/2;
}
if (sched_feat(USE_TREE_AVG)) {
struct sched_entity *last = __pick_last_entity(cfs_rq);
if (last) {
min_runtime = __pick_next_entity(cfs_rq)->vruntime;
min_runtime += last->vruntime;
min_runtime >>= 1;
}
} else if (sched_feat(APPROX_AVG))
min_runtime += sysctl_sched_latency/2;
if (initial && sched_feat(START_DEBIT))
min_runtime += sched_slice(cfs_rq, se);
if (!initial && sched_feat(NEW_FAIR_SLEEPERS)) {
latency = sysctl_sched_latency;