sched: rt-bandwidth accounting fix

It fixes an accounting bug where we would continue accumulating runtime
even though the bandwidth control is disabled. This would lead to very long
throttle periods once bandwidth control gets turned on again.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 998ba54..77340b0 100644 (file)
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -438,9 +438,6 @@ static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq)
 {
        u64 runtime = sched_rt_runtime(rt_rq);
 
-       if (runtime == RUNTIME_INF)
-               return 0;
-
        if (rt_rq->rt_throttled)
                return rt_rq_throttled(rt_rq);
 
@@ -491,9 +488,11 @@ static void update_curr_rt(struct rq *rq)
                rt_rq = rt_rq_of_se(rt_se);
 
                spin_lock(&rt_rq->rt_runtime_lock);
-               rt_rq->rt_time += delta_exec;
-               if (sched_rt_runtime_exceeded(rt_rq))
-                       resched_task(curr);
+               if (sched_rt_runtime(rt_rq) != RUNTIME_INF) {
+                       rt_rq->rt_time += delta_exec;
+                       if (sched_rt_runtime_exceeded(rt_rq))
+                               resched_task(curr);
+               }
                spin_unlock(&rt_rq->rt_runtime_lock);
        }
 }