linux-kernel - [PATCH] sched/fair: Use this_sd->weight to calculate span

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Date:   Sun, 10 Oct 2021 02:10:55 +0800
From:   Tao Zhou <tao.zhou@...ux.dev>
To:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>
Cc:     Tao Zhou <tao.zhou@...ux.dev>
Subject: [PATCH] sched/fair: Use this_sd->weight to calculate span_avg

avg_idle, avg_cost got from this_rq and this_sd. I think
use this_sd->weight to calculate and estimate the number
of loop cpus in the target domain.
---
 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 f6a05d9b5443..7fab7b70814c 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6300,7 +6300,7 @@ static int select_idle_cpu(struct task_struct *p, struct sched_domain *sd, bool
 		avg_idle = this_rq->wake_avg_idle;
 		avg_cost = this_sd->avg_scan_cost + 1;
 
-		span_avg = sd->span_weight * avg_idle;
+		span_avg = this_sd->span_weight * avg_idle;
 		if (span_avg > 4*avg_cost)
 			nr = div_u64(span_avg, avg_cost);
 		else
-- 
2.32.0