linux-kernel - Re: [PATCH v1 1/1] mm: Fix OOM killer and proc stats inaccuracy on large many-core systems

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Message-ID: <11a68471-e856-41f7-b4d8-dff346bad1ce@efficios.com>
Date: Wed, 14 Jan 2026 09:57:03 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Baolin Wang <baolin.wang@...ux.alibaba.com>,
 Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, "Paul E. McKenney" <paulmck@...nel.org>,
 Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu
 <mhiramat@...nel.org>, Dennis Zhou <dennis@...nel.org>,
 Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
 Martin Liu <liumartin@...gle.com>, David Rientjes <rientjes@...gle.com>,
 christian.koenig@....com, Shakeel Butt <shakeel.butt@...ux.dev>,
 SeongJae Park <sj@...nel.org>, Michal Hocko <mhocko@...e.com>,
 Johannes Weiner <hannes@...xchg.org>,
 Sweet Tea Dorminy <sweettea-kernel@...miny.me>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 "Liam R . Howlett" <liam.howlett@...cle.com>, Mike Rapoport
 <rppt@...nel.org>, Suren Baghdasaryan <surenb@...gle.com>,
 Vlastimil Babka <vbabka@...e.cz>, Christian Brauner <brauner@...nel.org>,
 Wei Yang <richard.weiyang@...il.com>, David Hildenbrand <david@...hat.com>,
 Miaohe Lin <linmiaohe@...wei.com>, Al Viro <viro@...iv.linux.org.uk>,
 linux-mm@...ck.org, stable@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, Yu Zhao <yuzhao@...gle.com>,
 Roman Gushchin <roman.gushchin@...ux.dev>, Mateusz Guzik
 <mjguzik@...il.com>, Matthew Wilcox <willy@...radead.org>,
 Aboorva Devarajan <aboorvad@...ux.ibm.com>
Subject: Re: [PATCH v1 1/1] mm: Fix OOM killer and proc stats inaccuracy on
 large many-core systems

On 2026-01-13 22:18, Baolin Wang wrote:

> 
> I'm not against this patch. However, I’m concerned that it may affect 
> not only the rest of the proc files, but also fork(), which calls 
> get_mm_rss(). At least we should evaluate its impact on fork()?
> 
It's fixed in v2. I'm introducing get_mm_rss_sum() specifically for
the oom killer.

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com