[RFC PATCH] sched/fair: Prevent from cpufreq not being updated when delayed-task is iowait

[Xuewen Yan <xuewen.yan@unisoc.com>]

Because the sched-delayed task maybe in io-wait state,
so we should place the requeue_delayed_entity() after the
cpufreq_update_util(), to prevent not boosting iowait cpufreq
before return.

Signed-off-by: Xuewen Yan <xuewen.yan@unisoc.com>
---
 kernel/sched/fair.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 2d6d5582c3e9..040674734128 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6931,11 +6931,6 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
 	if (!(p->se.sched_delayed && (task_on_rq_migrating(p) || (flags & ENQUEUE_RESTORE))))
 		util_est_enqueue(&rq->cfs, p);
 
-	if (flags & ENQUEUE_DELAYED) {
-		requeue_delayed_entity(se);
-		return;
-	}
-
 	/*
 	 * If in_iowait is set, the code below may not trigger any cpufreq
 	 * utilization updates, so do it here explicitly with the IOWAIT flag
@@ -6944,6 +6939,11 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
 	if (p->in_iowait)
 		cpufreq_update_util(rq, SCHED_CPUFREQ_IOWAIT);
 
+	if (flags & ENQUEUE_DELAYED) {
+		requeue_delayed_entity(se);
+		return;
+	}
+
 	if (task_new && se->sched_delayed)
 		h_nr_runnable = 0;
 
-- 
2.25.1