linux-kernel - Re: [PATCH v2 3/3] mm/memcg: introduce mem_cgroup_early

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Message-ID: <1166b629-92a0-47d5-8cba-01aafd928e25@vivo.com>
Date: Fri, 25 Apr 2025 09:11:01 +0800
From: Huan Yang <link@...o.com>
To: Shakeel Butt <shakeel.butt@...ux.dev>
Cc: Johannes Weiner <hannes@...xchg.org>, Michal Hocko <mhocko@...nel.org>,
 Roman Gushchin <roman.gushchin@...ux.dev>,
 Muchun Song <muchun.song@...ux.dev>,
 Andrew Morton <akpm@...ux-foundation.org>, Petr Mladek <pmladek@...e.com>,
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 Francesco Valla <francesco@...la.it>,
 Huang Shijie <shijie@...amperecomputing.com>, KP Singh <kpsingh@...nel.org>,
 "Paul E. McKenney" <paulmck@...nel.org>,
 Rasmus Villemoes <linux@...musvillemoes.dk>,
 "Uladzislau Rezki (Sony)" <urezki@...il.com>,
 Guo Weikang <guoweikang.kernel@...il.com>,
 Raul E Rangel <rrangel@...omium.org>, cgroups@...r.kernel.org,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org,
 Boqun Feng <boqun.feng@...il.com>, Geert Uytterhoeven
 <geert@...ux-m68k.org>, Paul Moore <paul@...l-moore.com>,
 "Mike Rapoport (Microsoft)" <rppt@...nel.org>, opensource.kernel@...o.com
Subject: Re: [PATCH v2 3/3] mm/memcg: introduce mem_cgroup_early_init

Hi Shakeel

在 2025/4/25 07:00, Shakeel Butt 写道:
> On Thu, Apr 24, 2025 at 09:00:01AM -0700, Shakeel Butt wrote:
>> On Thu, Apr 24, 2025 at 08:09:29PM +0800, Huan Yang wrote:
>>> When cgroup_init() creates root_mem_cgroup through css_online callback,
>>> some critical resources might not be fully initialized, forcing later
>>> operations to perform conditional checks for resource availability.
>>>
>>> This patch introduces mem_cgroup_early_init() to address the init order,
>>> it invoke before cgroup_init, so, compare mem_cgroup_init which invoked
>>> by initcall, mem_cgroup_early_init can use to prepare some key resources
>>> before root_mem_cgroup alloc.
>>>
>>> Signed-off-by: Huan Yang <link@...o.com>
>>> Suggested-by: Shakeel Butt <shakeel.butt@...ux.dev>
>> Please move this patch as the first patch of the series and also remove
>> the "early" from the function name as it has a different meaning in the
>> context of cgroup init. Something like either memcg_init() or
>> memcg_kmem_caches_init().
> BTW I think just putting this kmem cache creation in mem_cgroup_init()
> and explicitly calling it before cgroup_init() would be fine. In that
> case there would be a single memcg init function.

Maybe someone also need init something after cgroup init done?

Currently no, but for furture may need?

So, memcg_init then cgroup_init then initcall->mem_cgroup_init.

Thanks,

Huan