Commit-ID: 4a6184ce7a48c478dee0d8a9ed74c1fa35161858
Gitweb: http://git.kernel.org/tip/4a6184ce7a48c478dee0d8a9ed74c1fa35161858
Author: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
AuthorDate: Thu, 6 Oct 2011 22:39:14 +0200
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Mon, 14 Nov 2011 12:50:40 +0100
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@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
kernel/sched_features.h | 1 +
kernel/sched_rt.c | 3 +++
2 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/kernel/sched_features.h b/kernel/sched_features.h
index efa0a7b..8480224 100644
--- 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
index 056cbd2..583a136 100644
--- 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);
--
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