linux-kernel - [PATCH] sched/fair: Fix the logic about active_balance in load

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Date:   Sun,  2 Aug 2020 12:51:41 +0800
From:   Qi Zheng <arch0.zheng@...il.com>
To:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de
Cc:     linux-kernel@...r.kernel.org, Qi Zheng <arch0.zheng@...il.com>
Subject: [PATCH] sched/fair: Fix the logic about active_balance in load_balance()

I think the unbalance scenario here should be that we need to
do active balance but it is not actually done. So fix it.

Signed-off-by: Qi Zheng <arch0.zheng@...il.com>
---
 kernel/sched/fair.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 2ba8f230feb9..6d8c53718b67 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -9710,7 +9710,7 @@ static int load_balance(int this_cpu, struct rq *this_rq,
 	} else
 		sd->nr_balance_failed = 0;
 
-	if (likely(!active_balance) || voluntary_active_balance(&env)) {
+	if (likely(!active_balance) && voluntary_active_balance(&env)) {
 		/* We were unbalanced, so reset the balancing interval */
 		sd->balance_interval = sd->min_interval;
 	} else {
-- 
2.25.1