linux-kernel - Re: [PATCH v2 00/28] Eliminate Dying Memory Cgroup

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Message-ID: <a4fzkz4lznq5hrf3mmrhpt723rb2sl7puo6ziwg32ye6jh7rwk@baexbljj3duu>
Date: Mon, 29 Dec 2025 11:53:15 +0100
From: Michal Koutný <mkoutny@...e.com>
To: Harry Yoo <harry.yoo@...cle.com>
Cc: Qi Zheng <qi.zheng@...ux.dev>, Shakeel Butt <shakeel.butt@...ux.dev>, 
	Yosry Ahmed <yosry.ahmed@...ux.dev>, hannes@...xchg.org, hughd@...gle.com, mhocko@...e.com, 
	roman.gushchin@...ux.dev, muchun.song@...ux.dev, david@...nel.org, 
	lorenzo.stoakes@...cle.com, ziy@...dia.com, imran.f.khan@...cle.com, 
	kamalesh.babulal@...cle.com, axelrasmussen@...gle.com, yuanchu@...gle.com, weixugc@...gle.com, 
	chenridong@...weicloud.com, akpm@...ux-foundation.org, hamzamahfooz@...ux.microsoft.com, 
	apais@...ux.microsoft.com, lance.yang@...ux.dev, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org, Qi Zheng <zhengqi.arch@...edance.com>
Subject: Re: [PATCH v2 00/28] Eliminate Dying Memory Cgroup

On Mon, Dec 29, 2025 at 06:35:22PM +0900, Harry Yoo <harry.yoo@...cle.com> wrote:
> > The memcg-v1 was originally planned to be removed, could we skip
> > supporting v1?
> 
> You mean not reparenting LRU pages if CONFIG_MEMCG_V1 is set?

More precisely it should be dynamic
	!cgroup_subsys_on_dfl(memory_cgrp_subsys)

> That may work,

But would it make the code actually simpler? (Keeping two versions at
multiple places vs transferring local stats at the right moment.)

Thanks,
Michal

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