linux-kernel - [PATCH] sched/fair: consider sched-idle CPU when selecting idle core

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Date:   Fri, 24 Jul 2020 07:38:53 +0800
From:   Jiang Biao <humjb_1983@....com>
To:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org
Cc:     dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, linux-kernel@...r.kernel.org,
        Jiang Biao <benbjiang@...cent.com>
Subject: [PATCH] sched/fair: consider sched-idle CPU when selecting idle core

From: Jiang Biao <benbjiang@...cent.com>

Sched-idle CPU has been considered in select_idle_cpu and
select_idle_smt, it also needs to be considered in select_idle_core to
be consistent and keep the same *idle* policy.

Signed-off-by: Jiang Biao <benbjiang@...cent.com>
---
 kernel/sched/fair.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 04fa8dbcfa4d..f430a9820d08 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6014,7 +6014,7 @@ void __update_idle_core(struct rq *rq)
 		if (cpu == core)
 			continue;
 
-		if (!available_idle_cpu(cpu))
+		if (!available_idle_cpu(cpu) && !sched_idle_cpu(cpu))
 			goto unlock;
 	}
 
@@ -6045,7 +6045,7 @@ static int select_idle_core(struct task_struct *p, struct sched_domain *sd, int
 		bool idle = true;
 
 		for_each_cpu(cpu, cpu_smt_mask(core)) {
-			if (!available_idle_cpu(cpu)) {
+			if (!available_idle_cpu(cpu) && !sched_idle_cpu(cpu)) {
 				idle = false;
 				break;
 			}
-- 
2.21.0