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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: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
hifive-unleashed-5.1
Peter Zijlstra 2008-04-19 19:45:00 +02:00 committed by Ingo Molnar
parent 58d6c2d72f
commit ac884dec6d
1 changed files with 33 additions and 15 deletions
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48
kernel/sched_fair.c
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@ -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)
{
return calc_delta_mine(__sched_period(cfs_rq->nr_running),
se->load.weight, &cfs_rq->load);
u64 slice = __sched_period(cfs_rq->nr_running);
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
*/
static u64 __sched_vslice(unsigned long rq_weight, unsigned long nr_running)
{
u64 vslice = __sched_period(nr_running);
vslice *= NICE_0_LOAD;
do_div(vslice, rq_weight);
return vslice;
}
static u64 sched_vslice_add(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
return __sched_vslice(cfs_rq->load.weight + se->load.weight,
cfs_rq->nr_running + 1);
unsigned long nr_running = cfs_rq->nr_running;
unsigned long weight;
u64 vslice;
if (!se->on_rq)
nr_running++;
vslice = __sched_period(nr_running);
for_each_sched_entity(se) {
cfs_rq = cfs_rq_of(se);
weight = cfs_rq->load.weight;
if (!se->on_rq)
weight += se->load.weight;
vslice *= NICE_0_LOAD;
do_div(vslice, weight);
}
return vslice;
}
/*