linux-kernel - Re: [PATCH v3 2/3] sched/debug: dump domains' level

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Date: Thu, 4 Apr 2024 14:26:08 +0200
From: Vincent Guittot <vincent.guittot@...aro.org>
To: Vitalii Bursov <vitaly@...sov.com>
Cc: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>, 
	Juri Lelli <juri.lelli@...hat.com>, Dietmar Eggemann <dietmar.eggemann@....com>, 
	Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>, 
	Daniel Bristot de Oliveira <bristot@...hat.com>, Valentin Schneider <vschneid@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] sched/debug: dump domains' level

On Wed, 3 Apr 2024 at 15:28, Vitalii Bursov <vitaly@...sov.com> wrote:
>
> Knowing domain's level exactly can be useful when setting
> relax_domain_level or cpuset.sched_relax_domain_level
>
> Usage:
> cat /debug/sched/domains/cpu0/domain1/level
> to dump cpu0 domain1's level.
>
> Signed-off-by: Vitalii Bursov <vitaly@...sov.com>

Acked-by: Vincent Guittot <vincent.guittot@...aro.org>

> ---
>  kernel/sched/debug.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
> index 8d5d98a5834d..c1eb9a1afd13 100644
> --- a/kernel/sched/debug.c
> +++ b/kernel/sched/debug.c
> @@ -425,6 +425,7 @@ static void register_sd(struct sched_domain *sd, struct dentry *parent)
>
>         debugfs_create_file("flags", 0444, parent, &sd->flags, &sd_flags_fops);
>         debugfs_create_file("groups_flags", 0444, parent, &sd->groups->flags, &sd_flags_fops);
> +       debugfs_create_u32("level", 0444, parent, (u32 *)&sd->level);
>  }
>
>  void update_sched_domain_debugfs(void)
> --
> 2.20.1
>