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

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Message-ID: <ufnmsikyh6budl4qkhy5o4m76yldvlns3yja743bdwvxwsljer@ztbsqf7gx6oi>
Date: Thu, 3 Apr 2025 20:03:01 +0200
From: Michal Koutný <mkoutny@...e.com>
To: "Chen, Yu C" <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

On Thu, Apr 03, 2025 at 10:47:44AM +0800, "Chen, Yu C" <yu.c.chen@...el.com> wrote:
> In the context of NUMA balancing, it would be helpful to not only monitor on
> the activities of individual task/thread but also the resource usage and
> task migrations at the group level - which helps us quickly evaluate the
> performance and resource usage of the container - like per memcg
> numa_pages_migrated, numa_pte_updates introduced in

Somehow I thought that these are the useful metrics (amount of misplaced
memory) and the aggregated task stats aren't interesting (they'd be more
or less proportion of total number of tasks in the group and you don't
know which task it was).

> Got it, will do in next version.

OK.

Thanks,
Michal

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