linux-kernel - Re: [PATCH v5 2/2] sched/numa: add statistics of numa balance task

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Message-ID: <uuhyie7udxyvbdpccwi7dl5cy26ygkkuxjixpl247u5nqwpcqm@5whxlt5ddswo>
Date: Mon, 26 May 2025 15:35:47 +0200
From: Michal Koutný <mkoutny@...e.com>
To: Shakeel Butt <shakeel.butt@...ux.dev>
Cc: Chen Yu <yu.c.chen@...el.com>, peterz@...radead.org, 
	akpm@...ux-foundation.org, mingo@...hat.com, tj@...nel.org, hannes@...xchg.org, 
	corbet@....net, mgorman@...e.de, mhocko@...nel.org, muchun.song@...ux.dev, 
	roman.gushchin@...ux.dev, tim.c.chen@...el.com, aubrey.li@...el.com, libo.chen@...cle.com, 
	kprateek.nayak@....com, vineethr@...ux.ibm.com, venkat88@...ux.ibm.com, ayushjai@....com, 
	cgroups@...r.kernel.org, linux-doc@...r.kernel.org, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org, yu.chen.surf@...mail.com
Subject: Re: [PATCH v5 2/2] sched/numa: add statistics of numa balance task

On Fri, May 23, 2025 at 04:42:50PM -0700, Shakeel Butt <shakeel.butt@...ux.dev> wrote:
> Hmm these are scheduler events, how are these relevant to memory cgroup
> or vmstat? Any reason to not expose these in cpu.stat?

Good point. If I take it further -- this functionality needs neither
memory controller (CONFIG_MEMCG) nor CPU controller
(CONFIG_CGROUP_SCHED), so it might be technically calculated and exposed
in _any_ cgroup (which would be same technical solution how cpu time is
counted in cpu.stat regardless of CPU controller, cpu_stat_show()).

Michal

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