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

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Message-ID: <d8bb7091-7127-41df-9a2d-0b51897592a7@amd.com>
Date: Fri, 12 Sep 2025 08:10:21 +0530
From: K Prateek Nayak <kprateek.nayak@....com>
To: Yury Norov <yury.norov@...il.com>, 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>
Subject: Re: [PATCH] sched/fair: simplify task_numa_find_cpu()

Hello Yury,

On 9/12/2025 2:01 AM, Yury Norov wrote:
> From: Yury Norov (NVIDIA) <yury.norov@...il.com>
> 
> Use for_each_cpu_and() and drop some housekeeping code.

Please feel free to include:

Reviewed-by: K Prateek Nayak <kprateek.nayak@....com>

> 
> 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;

-- 
Thanks and Regards,
Prateek