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Date:   Wed, 23 Dec 2020 16:09:28 +0800
Subject: [PATCH] sched: pull tasks when CPU is about to run SCHED_IDLE tasks

From: Chen Xiaoguang <>

Before a CPU switches from running SCHED_NORMAL task to
SCHED_IDLE task, trying to pull SCHED_NORMAL tasks from other
CPU by doing load_balance first.

Signed-off-by: Chen Xiaoguang <>
Signed-off-by: Chen He <>
 kernel/sched/fair.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index ae7ceba..0a26132 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7004,6 +7004,11 @@ struct task_struct *
 	struct task_struct *p;
 	int new_tasks;
+	if (prev &&
+	    fair_policy(prev->policy) &&
+	    sched_idle_cpu(rq->cpu))
+		goto idle;
 	if (!sched_fair_runnable(rq))
 		goto idle;

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