linux-kernel - Re: [PATCH v12 0/3] mm: Fix OOM killer inaccuracy on large many-core systems

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Message-Id: <20260111094823.6fcb1fcceb7cfca2dd37b66e@linux-foundation.org>
Date: Sun, 11 Jan 2026 09:48:23 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
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, 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>, Baolin
 Wang <baolin.wang@...ux.alibaba.com>, Aboorva Devarajan
 <aboorvad@...ux.ibm.com>, Roman Gushchin <roman.gushchin@...ux.dev>
Subject: Re: [PATCH v12 0/3] mm: Fix OOM killer inaccuracy on large
 many-core systems

On Sun, 11 Jan 2026 10:02:46 -0500 Mathieu Desnoyers <mathieu.desnoyers@...icios.com> wrote:

> Introduce hierarchical per-cpu counters and use them for RSS tracking to
> fix the per-mm RSS tracking which has become too inaccurate for OOM
> killer purposes on large many-core systems.

Great, thanks.

> Notable changes for v12:
> 
> - Reduce per-CPU counters memory allocation size to sizeof long
>   (fixing mixup with sizeof intermediate cache line aligned items).
> - Use "long" counters types rather than "int".
> - get_mm_counter_sum() returns a precise sum.
> - Introduce and use functions to calculate the min/max possible precise
>   sum values associated with an approximate sum.

May I ask, as an early adopter, what is your overall impression of
the Gemini reviewbot?