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Date: Sun, 11 Jan 2026 09:48:23 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: linux-kernel@vger.kernel.org, "Paul E. McKenney" <paulmck@kernel.org>,
 Steven Rostedt <rostedt@goodmis.org>, Masami Hiramatsu
 <mhiramat@kernel.org>, Dennis Zhou <dennis@kernel.org>, Tejun Heo
 <tj@kernel.org>, Christoph Lameter <cl@linux.com>, Martin Liu
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 christian.koenig@amd.com, Shakeel Butt <shakeel.butt@linux.dev>, SeongJae
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 <hannes@cmpxchg.org>, Sweet Tea Dorminy <sweettea-kernel@dorminy.me>,
 Lorenzo Stoakes <lorenzo.stoakes@oracle.com>, "Liam R . Howlett"
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 Lin <linmiaohe@huawei.com>, Al Viro <viro@zeniv.linux.org.uk>,
 linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, Yu Zhao
 <yuzhao@google.com>, Roman Gushchin <roman.gushchin@linux.dev>, Mateusz
 Guzik <mjguzik@gmail.com>, Matthew Wilcox <willy@infradead.org>, Baolin
 Wang <baolin.wang@linux.alibaba.com>, Aboorva Devarajan
 <aboorvad@linux.ibm.com>, Roman Gushchin <roman.gushchin@linux.dev>
Subject: Re: [PATCH v12 0/3] mm: Fix OOM killer inaccuracy on large
 many-core systems
Message-Id: <20260111094823.6fcb1fcceb7cfca2dd37b66e@linux-foundation.org>
In-Reply-To: <20260111150249.1222944-1-mathieu.desnoyers@efficios.com>
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On Sun, 11 Jan 2026 10:02:46 -0500 Mathieu Desnoyers <mathieu.desnoyers@efficios.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?