linux-kernel - Re: [PATCH -next v3 2/2] memcg: remove mem_cgroup

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Message-ID: <6wm77ncacitv7fb2nc7sshpjjqshsh4xffey4qxhzu6oz4gevl@qehhysirzyhq>
Date: Tue, 16 Dec 2025 14:55:43 +0100
From: Michal Koutný <mkoutny@...e.com>
To: Chen Ridong <chenridong@...weicloud.com>
Cc: hannes@...xchg.org, mhocko@...nel.org, roman.gushchin@...ux.dev, 
	shakeel.butt@...ux.dev, muchun.song@...ux.dev, akpm@...ux-foundation.org, 
	axelrasmussen@...gle.com, yuanchu@...gle.com, weixugc@...gle.com, david@...nel.org, 
	zhengqi.arch@...edance.com, lorenzo.stoakes@...cle.com, cgroups@...r.kernel.org, 
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, lujialin4@...wei.com
Subject: Re: [PATCH -next v3 2/2] memcg: remove mem_cgroup_size()

On Tue, Dec 16, 2025 at 08:34:40PM +0800, Chen Ridong <chenridong@...weicloud.com> wrote:
> In my v2 patch, I was reading the usage directly:
> 
> +		unsigned long usage = page_counter_read(&memcg->memory);
> 
> This works fine when CONFIG_MEMCG=y, but fails to compile when memory cgroups are disabled. To
> handle this, I initially added #ifdef CONFIG_MEMCG guards.

Ah, !CONFIG_MEMCG, I get it now. Sorry for the noise.

Michal

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