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-rw-r--r--kernel/sched_rt.c31
1 files changed, 11 insertions, 20 deletions
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 3918e01..a8f89bc 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -1056,6 +1056,11 @@ static struct task_struct *_pick_next_task_rt(struct rq *rq)
return p;
}
+static inline int has_pushable_tasks(struct rq *rq)
+{
+ return !plist_head_empty(&rq->rt.pushable_tasks);
+}
+
static struct task_struct *pick_next_task_rt(struct rq *rq)
{
struct task_struct *p = _pick_next_task_rt(rq);
@@ -1064,6 +1069,12 @@ static struct task_struct *pick_next_task_rt(struct rq *rq)
if (p)
dequeue_pushable_task(rq, p);
+ /*
+ * We detect this state here so that we can avoid taking the RQ
+ * lock again later if there is no need to push
+ */
+ rq->post_schedule = has_pushable_tasks(rq);
+
return p;
}
@@ -1262,11 +1273,6 @@ static struct rq *find_lock_lowest_rq(struct task_struct *task, struct rq *rq)
return lowest_rq;
}
-static inline int has_pushable_tasks(struct rq *rq)
-{
- return !plist_head_empty(&rq->rt.pushable_tasks);
-}
-
static struct task_struct *pick_next_pushable_task(struct rq *rq)
{
struct task_struct *p;
@@ -1466,23 +1472,9 @@ static void pre_schedule_rt(struct rq *rq, struct task_struct *prev)
pull_rt_task(rq);
}
-/*
- * assumes rq->lock is held
- */
-static int needs_post_schedule_rt(struct rq *rq)
-{
- return has_pushable_tasks(rq);
-}
-
static void post_schedule_rt(struct rq *rq)
{
- /*
- * This is only called if needs_post_schedule_rt() indicates that
- * we need to push tasks away
- */
- spin_lock_irq(&rq->lock);
push_rt_tasks(rq);
- spin_unlock_irq(&rq->lock);
}
/*
@@ -1758,7 +1750,6 @@ static const struct sched_class rt_sched_class = {
.rq_online = rq_online_rt,
.rq_offline = rq_offline_rt,
.pre_schedule = pre_schedule_rt,
- .needs_post_schedule = needs_post_schedule_rt,
.post_schedule = post_schedule_rt,
.task_wake_up = task_wake_up_rt,
.switched_from = switched_from_rt,
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