linux-kernel - Re: [PATCH v3 1/3] mm/memcg: move mem_cgroup_init() ahead of cgroup

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Message-ID: <30033ec9-cc64-46a2-8d3f-98b03f57c39a@vivo.com>
Date: Mon, 28 Apr 2025 10:20:06 +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>,
 Vlastimil Babka <vbabka@...e.cz>, Rasmus Villemoes
 <linux@...musvillemoes.dk>, Francesco Valla <francesco@...la.it>,
 Raul E Rangel <rrangel@...omium.org>, "Paul E. McKenney"
 <paulmck@...nel.org>, Huang Shijie <shijie@...amperecomputing.com>,
 Guo Weikang <guoweikang.kernel@...il.com>,
 "Uladzislau Rezki (Sony)" <urezki@...il.com>, KP Singh <kpsingh@...nel.org>,
 cgroups@...r.kernel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
 Alexander Gordeev <agordeev@...ux.ibm.com>, Boqun Feng
 <boqun.feng@...il.com>, opensource.kernel@...o.com
Subject: Re: [PATCH v3 1/3] mm/memcg: move mem_cgroup_init() ahead of
 cgroup_init()

在 2025/4/25 12:11, Shakeel Butt 写道:
> On Thu, Apr 24, 2025 at 8:19 PM Huan Yang <link@...o.com> wrote:
>> When cgroup_init() creates root_mem_cgroup through css_alloc callback,
>> some critical resources might not be fully initialized, forcing later
>> operations to perform conditional checks for resource availability.
>>
>> This patch move mem_cgroup_init() to address the init order, it invoke
>> before cgroup_init, so, compare to subsys_initcall, it 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>
> Acked-by: Shakeel Butt <shakeel.butt@...ux.dev>
thx.
>