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

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

kernel/sched_fair.c

+31 −13
Original line number Diff line number Diff line
@@ -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)

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;

	do_div(vslice, rq_weight);

	if (!se->on_rq)

		nr_running++;



	return vslice;

	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);

	}



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);

	return vslice;

}



/*