Commit e7097159 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

sched: Optimize unused cgroup configuration 



When cgroup group scheduling is built in, skip some code paths
if we don't have any (but the root) cgroups configured.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent a5004278

kernel/sched.c

+14 −2
Original line number Diff line number Diff line
@@ -1629,8 +1629,14 @@ static int tg_load_down(struct task_group *tg, void *data) 


static void update_shares(struct sched_domain *sd)

{

	u64 now = cpu_clock(raw_smp_processor_id());

	s64 elapsed = now - sd->last_update;

	s64 elapsed;

	u64 now;



	if (root_task_group_empty())

		return;



	now = cpu_clock(raw_smp_processor_id());

	elapsed = now - sd->last_update;



	if (elapsed >= (s64)(u64)sysctl_sched_shares_ratelimit) {

		sd->last_update = now;
@@ -1640,6 +1646,9 @@ static void update_shares(struct sched_domain *sd) 


static void update_shares_locked(struct rq *rq, struct sched_domain *sd)

{

	if (root_task_group_empty())

		return;



	spin_unlock(&rq->lock);

	update_shares(sd);

	spin_lock(&rq->lock);
@@ -1647,6 +1656,9 @@ static void update_shares_locked(struct rq *rq, struct sched_domain *sd) 


static void update_h_load(long cpu)

{

	if (root_task_group_empty())

		return;



	walk_tg_tree(tg_load_down, tg_nop, (void *)cpu);

}