Commit ac884dec authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar

sched: fair-group scheduling vs latency

Currently FAIR_GROUP sched grows the scheduler latency outside of
sysctl_sched_latency, invert this so it stays within.
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 58d6c2d7
...@@ -362,29 +362,47 @@ static u64 __sched_period(unsigned long nr_running) ...@@ -362,29 +362,47 @@ static u64 __sched_period(unsigned long nr_running)
*/ */
static u64 sched_slice(struct cfs_rq *cfs_rq, struct sched_entity *se) static u64 sched_slice(struct cfs_rq *cfs_rq, struct sched_entity *se)
{ {
return calc_delta_mine(__sched_period(cfs_rq->nr_running), u64 slice = __sched_period(cfs_rq->nr_running);
se->load.weight, &cfs_rq->load);
for_each_sched_entity(se) {
cfs_rq = cfs_rq_of(se);
slice *= se->load.weight;
do_div(slice, cfs_rq->load.weight);
}
return slice;
} }
/* /*
* We calculate the vruntime slice. * We calculate the vruntime slice of a to be inserted task
* *
* vs = s/w = p/rw * vs = s/w = p/rw
*/ */
static u64 __sched_vslice(unsigned long rq_weight, unsigned long nr_running) static u64 sched_vslice_add(struct cfs_rq *cfs_rq, struct sched_entity *se)
{ {
u64 vslice = __sched_period(nr_running); unsigned long nr_running = cfs_rq->nr_running;
unsigned long weight;
u64 vslice;
vslice *= NICE_0_LOAD; if (!se->on_rq)
do_div(vslice, rq_weight); nr_running++;
return vslice; vslice = __sched_period(nr_running);
}
static u64 sched_vslice_add(struct cfs_rq *cfs_rq, struct sched_entity *se) for_each_sched_entity(se) {
{ cfs_rq = cfs_rq_of(se);
return __sched_vslice(cfs_rq->load.weight + se->load.weight,
cfs_rq->nr_running + 1); weight = cfs_rq->load.weight;
if (!se->on_rq)
weight += se->load.weight;
vslice *= NICE_0_LOAD;
do_div(vslice, weight);
}
return vslice;
} }
/* /*
......
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