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-rw-r--r--kernel/sched/idle_task.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/kernel/sched/idle_task.c b/kernel/sched/idle_task.c
index b6baf370cae9..b8ce77328341 100644
--- a/kernel/sched/idle_task.c
+++ b/kernel/sched/idle_task.c
@@ -13,6 +13,16 @@ select_task_rq_idle(struct task_struct *p, int sd_flag, int flags)
{
return task_cpu(p); /* IDLE tasks as never migrated */
}
+
+static void pre_schedule_idle(struct rq *rq, struct task_struct *prev)
+{
+ idle_exit_fair(rq);
+}
+
+static void post_schedule_idle(struct rq *rq)
+{
+ idle_enter_fair(rq);
+}
#endif /* CONFIG_SMP */
/*
* Idle tasks are unconditionally rescheduled:
@@ -25,6 +35,10 @@ static void check_preempt_curr_idle(struct rq *rq, struct task_struct *p, int fl
static struct task_struct *pick_next_task_idle(struct rq *rq)
{
schedstat_inc(rq, sched_goidle);
+#ifdef CONFIG_SMP
+ /* Trigger the post schedule to do an idle_enter for CFS */
+ rq->post_schedule = 1;
+#endif
return rq->idle;
}
@@ -86,6 +100,8 @@ const struct sched_class idle_sched_class = {
#ifdef CONFIG_SMP
.select_task_rq = select_task_rq_idle,
+ .pre_schedule = pre_schedule_idle,
+ .post_schedule = post_schedule_idle,
#endif
.set_curr_task = set_curr_task_idle,