[PATCH v3 2/3] sched/rt: __disable_runtime: Enqueue just unthrottled rt_rq back on the stack

Kirill Tkhai
2014-06-25T08:19:56Z

Make rt_rq available for pick_next_task(). Otherwise, their tasks
stay prisoned long time till dead cpu becomes alive again.

Signed-off-by: Kirill Tkhai <ktkhai@parallels.com>
CC: Konstantin Khorenko <khorenko@parallels.com>
CC: Ben Segall <bsegall@google.com>
CC: Paul Turner <pjt@google.com>
CC: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
CC: Mike Galbraith <umgwanakikbuti@gmail.com>
CC: Peter Zijlstra <peterz@infradead.org>
CC: Ingo Molnar <mingo@kernel.org>
---
kernel/sched/rt.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index a490831..671a8b5 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -740,6 +740,9 @@ static void __disable_runtime(struct rq *rq)
rt_rq->rt_throttled = 0;
raw_spin_unlock(&rt_rq->rt_runtime_lock);
raw_spin_unlock(&rt_b->rt_runtime_lock);
+
+ /* Make rt_rq available for pick_next_task() */
+ sched_rt_rq_enqueue(rt_rq);
}
}