linux-kernel - [tip: sched/core] sched/fair: Removed useless update of p->recent_used

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Date:   Fri, 01 Oct 2021 15:05:48 -0000
From:   "tip-bot2 for Vincent Guittot" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Vincent Guittot <vincent.guittot@...aro.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Mel Gorman <mgorman@...e.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/fair: Removed useless update of p->recent_used_cpu

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     959fc676791b91088b96341b644b92c8c52c7455
Gitweb:        https://git.kernel.org/tip/959fc676791b91088b96341b644b92c8c52c7455
Author:        Vincent Guittot <vincent.guittot@...aro.org>
AuthorDate:    Tue, 28 Sep 2021 12:35:44 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Fri, 01 Oct 2021 13:58:08 +02:00

sched/fair: Removed useless update of p->recent_used_cpu

Since commit 89aafd67f28c ("sched/fair: Use prev instead of new target as recent_used_cpu"),
p->recent_used_cpu is unconditionnaly set with prev.

Fixes: 89aafd67f28c ("sched/fair: Use prev instead of new target as recent_used_cpu")
Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Mel Gorman <mgorman@...e.de>
Link: https://lkml.kernel.org/r/20210928103544.27489-1-vincent.guittot@linaro.org
---
 kernel/sched/fair.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 2ce015c..8943dbb 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6380,11 +6380,6 @@ static int select_idle_sibling(struct task_struct *p, int prev, int target)
 	    (available_idle_cpu(recent_used_cpu) || sched_idle_cpu(recent_used_cpu)) &&
 	    cpumask_test_cpu(p->recent_used_cpu, p->cpus_ptr) &&
 	    asym_fits_capacity(task_util, recent_used_cpu)) {
-		/*
-		 * Replace recent_used_cpu with prev as it is a potential
-		 * candidate for the next wake:
-		 */
-		p->recent_used_cpu = prev;
 		return recent_used_cpu;
 	}