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

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Message-ID: <20250911203136.548844-1-yury.norov@gmail.com>
Date: Thu, 11 Sep 2025 16:31:35 -0400
From: Yury Norov <yury.norov@...il.com>
To: 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>,
	Valentin Schneider <vschneid@...hat.com>,
	linux-kernel@...r.kernel.org
Cc: Yury Norov <yury.norov@...il.com>
Subject: [PATCH] sched/fair: simplify task_numa_find_cpu()

From: Yury Norov (NVIDIA) <yury.norov@...il.com>

Use for_each_cpu_and() and drop some housekeeping code.

Signed-off-by: Yury Norov (NVIDIA) <yury.norov@...il.com>
---
 kernel/sched/fair.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 0990ed90c14e..c48c0975fe7a 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2474,11 +2474,8 @@ 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;
-
+	/* Skip CPUs if the source task cannot migrate */
+	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;
-- 
2.43.0