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

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Message-ID: <rifx3cqihmywhslbnpy6ge3pvl3acvgaasxvwyurrip3ewljnn@xqb4lex7xpsn>
Date: Thu, 3 Apr 2025 19:57:37 +0200
From: Michal Koutný <mkoutny@...e.com>
To: K Prateek Nayak <kprateek.nayak@....com>
Cc: Chen Yu <yu.c.chen@...el.com>, 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>, 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

On Wed, Apr 02, 2025 at 11:13:03PM +0530, K Prateek Nayak <kprateek.nayak@....com> wrote:
> The /proc/$pid/sched accounting is only done when schedstats are
> enabled. memcg users might want to track it separately without relying
> on schedstats which also enables a bunch of other scheduler related
> stats collection adding more overheads.

.oO(memory.[numa_]stat could end up with something similar since not all
users are interested in all fields but all users are affected by added
fields)

Thanks,
Michal

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