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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2008-08-14 15:49:00 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-08-14 15:50:58 +0200 |
| commit | f1679d08480008e06fd619c71635ed33274e2595 (patch) | |
| tree | bf38250a5b7c969a6b91ef1043f0cfdd02f966d4 /kernel | |
| parent | sched: fix the race between walk_tg_tree and sched_create_group (diff) | |
| download | linux-f1679d08480008e06fd619c71635ed33274e2595.tar.xz linux-f1679d08480008e06fd619c71635ed33274e2595.zip | |
sched: fix rt-bandwidth hotplug race
When we hot-unplug a cpu and rebuild the sched-domain, all cpus will be
detatched. Alex observed the case where a runqueue was stealing bandwidth
from an already disabled runqueue to satisfy its own needs.
Stop this by skipping over already disabled runqueues.
Reported-by: Alex Nixon <alex.nixon@citrix.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Tested-by: Alex Nixon <alex.nixon@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched_rt.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c index 6163e4cf885b..998ba54b4543 100644 --- a/kernel/sched_rt.c +++ b/kernel/sched_rt.c @@ -298,7 +298,7 @@ static void __disable_runtime(struct rq *rq) struct rt_rq *iter = sched_rt_period_rt_rq(rt_b, i); s64 diff; - if (iter == rt_rq) + if (iter == rt_rq || iter->rt_runtime == RUNTIME_INF) continue; spin_lock(&iter->rt_runtime_lock); |