linux-kernel - Re: [PATCH] sched/numa: Add statistics of numa balance task migration and swap

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Message-ID: <ufu5fuhwzzdhjoltgt5bpoqaonqur4t44phmz4oninzqlqpop7@hbwza7jri3ly>
Date: Wed, 2 Apr 2025 15:24:44 +0200
From: Michal Koutný <mkoutny@...e.com>
To: Chen Yu <yu.c.chen@...el.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Juri Lelli <juri.lelli@...hat.com>, Vincent Guittot <vincent.guittot@...aro.org>, 
	Mel Gorman <mgorman@...e.de>, Johannes Weiner <hannes@...xchg.org>, 
	Michal Hocko <mhocko@...nel.org>, Roman Gushchin <roman.gushchin@...ux.dev>, 
	Shakeel Butt <shakeel.butt@...ux.dev>, Muchun Song <muchun.song@...ux.dev>, 
	Andrew Morton <akpm@...ux-foundation.org>, Tim Chen <tim.c.chen@...el.com>, Aubrey Li <aubrey.li@...el.com>, 
	Rik van Riel <riel@...riel.com>, Raghavendra K T <raghavendra.kt@....com>, 
	K Prateek Nayak <kprateek.nayak@....com>, Baolin Wang <baolin.wang@...ux.alibaba.com>, 
	Xunlei Pang <xlpang@...ux.alibaba.com>, linux-kernel@...r.kernel.org, cgroups@...r.kernel.org, 
	linux-mm@...ck.org, Chen Yu <yu.chen.surf@...mail.com>
Subject: Re: [PATCH] sched/numa: Add statistics of numa balance task
 migration and swap

Hello Chen.

On Wed, Apr 02, 2025 at 09:06:11AM +0800, Chen Yu <yu.c.chen@...el.com> wrote:
> On system with NUMA balancing enabled, it is found that tracking
> the task activities due to NUMA balancing is helpful.
...
> The following two new fields:
> 
> numa_task_migrated
> numa_task_swapped
> 
> will be displayed in both
> /sys/fs/cgroup/{GROUP}/memory.stat and /proc/{PID}/sched

Why is the field /proc/$pid/sched not enough?

Also, you may want to update Documentation/admin-guide/cgroup-v2.rst
too.

Thanks,
Michal

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