linux-kernel - [PATCH] sched/fair: Drop the redundant setting of recent_used

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Date:   Thu, 30 Sep 2021 14:59:14 +0800
From:   Li RongQing <lirongqing@...du.com>
To:     linux-kernel@...r.kernel.org, lirongqing@...du.com,
        mingo@...hat.com, peterz@...radead.org
Subject: [PATCH] sched/fair: Drop the redundant setting of recent_used_cpu

recent_used_cpu has been set to prev before check

Signed-off-by: Li RongQing <lirongqing@...du.com>
---
 kernel/sched/fair.c |    8 +-------
 1 files changed, 1 insertions(+), 7 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 7b9fe8c..ec42eaa 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6437,14 +6437,8 @@ static int select_idle_sibling(struct task_struct *p, int prev, int target)
 	    cpus_share_cache(recent_used_cpu, 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;
+	    asym_fits_capacity(task_util, recent_used_cpu))
 		return recent_used_cpu;
-	}
 
 	/*
 	 * For asymmetric CPU capacity systems, our domain of interest is
-- 
1.7.1