diff options
authorPeter Zijlstra <>2008-06-19 09:06:59 +0200
committerIngo Molnar <>2008-06-19 09:06:59 +0200
commit15a8641eadb492ef7c5489faa25256967bdfd303 (patch)
parentad2a3f13b7258a5daaaeb8cff9f835aac468b71d (diff)
sched: rt-group: fix RR buglet
In tick_task_rt() we first call update_curr_rt() which can dequeue a runqueue due to it running out of runtime, and then we try to requeue it, of it also having exhausted its RR quota. Obviously requeueing something that is no longer on the runqueue will not have the expected result. Signed-off-by: Peter Zijlstra <> Tested-by: Daniel K. <> Signed-off-by: Ingo Molnar <>
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 837241568d76..1dad5bbb59b6 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -549,8 +549,10 @@ static
void requeue_rt_entity(struct rt_rq *rt_rq, struct sched_rt_entity *rt_se)
struct rt_prio_array *array = &rt_rq->active;
+ struct list_head *queue = array->queue + rt_se_prio(rt_se);
- list_move_tail(&rt_se->run_list, array->queue + rt_se_prio(rt_se));
+ if (on_rt_rq(rt_se))
+ list_move_tail(&rt_se->run_list, queue);
static void requeue_task_rt(struct rq *rq, struct task_struct *p)