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

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>
git-mirror · Nov 14, 2011 · 4a6184c · 4a6184c
1 parent c6dc7f0
commit 4a6184c
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diff --git a/kernel/sched_features.h b/kernel/sched_features.h
@@ -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)
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
@@ -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);
Original file line number	Diff line number	Diff line change
Expand Up		@@ -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)