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sched, rt: Provide means of disabling cross-cpu bandwidth sharing

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Normally the RT bandwidth scheme will share bandwidth across the
entire root_domain. However sometimes its convenient to disable this
sharing for debug purposes. Provide a simple feature switch to this
end.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2011-10-06 22:39:14 +02:00 committed by Ingo Molnar
parent c6dc7f055d
commit 4a6184ce7a
2 changed files with 4 additions and 0 deletions
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1
kernel/sched_features.h
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@ -67,3 +67,4 @@ SCHED_FEAT(NONTASK_POWER, 1)
SCHED_FEAT(TTWU_QUEUE, 1)
SCHED_FEAT(FORCE_SD_OVERLAP, 0)
SCHED_FEAT(RT_RUNTIME_SHARE, 1)

3
kernel/sched_rt.c
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@ -560,6 +560,9 @@ static int balance_runtime(struct rt_rq *rt_rq)
{
int more = 0;
if (!sched_feat(RT_RUNTIME_SHARE))
return more;
if (rt_rq->rt_time > rt_rq->rt_runtime) {
raw_spin_unlock(&rt_rq->rt_runtime_lock);
more = do_balance_runtime(rt_rq);