linux-kernel - [PATCH] sched/fair: Simplify task_numa_find

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Message-Id: <1635578759-32343-1-git-send-email-yuanzhaoxiong@baidu.com>
Date:   Sat, 30 Oct 2021 15:25:59 +0800
From:   Yuan ZhaoXiong <yuanzhaoxiong@...du.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,
        bristot@...hat.com
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] sched/fair: Simplify task_numa_find_cpu()

Combine the 'cpumask_of_node()' with 'env->p->cpus_ptr' and drop the
cpumask_test_cpu().

Signed-off-by: Yuan ZhaoXiong <yuanzhaoxiong@...du.com>
---
 kernel/sched/fair.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index f6a05d9..dc064d7 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1950,11 +1950,7 @@ static void task_numa_find_cpu(struct task_numa_env *env,
 		maymove = !load_too_imbalanced(src_load, dst_load, env);
 	}
 
-	for_each_cpu(cpu, cpumask_of_node(env->dst_nid)) {
-		/* Skip this CPU if the source task cannot migrate */
-		if (!cpumask_test_cpu(cpu, env->p->cpus_ptr))
-			continue;
-
+	for_each_cpu_and(cpu, cpumask_of_node(env->dst_nid), env->p->cpus_ptr) {
 		env->dst_cpu = cpu;
 		if (task_numa_compare(env, taskimp, groupimp, maymove))
 			break;
-- 
1.8.3.1