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: <20260113173533.171248b2f6c11c536e4fc65a@linux-foundation.org>
Date: Tue, 13 Jan 2026 17:35:33 -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, 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>, Baolin Wang
 <baolin.wang@...ux.alibaba.com>, 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 Tue, 13 Jan 2026 20:22:16 -0500 Mathieu Desnoyers <mathieu.desnoyers@...icios.com> wrote:

> On 2026-01-13 18:55, Andrew Morton wrote:
> > On Tue, 13 Jan 2026 17:16:16 -0500 Mathieu Desnoyers <mathieu.desnoyers@...icios.com> wrote:
> > 
> >> The hpcc series introduces an approximation which provides accuracy
> >> limits on the approximation that make the result is still somewhat
> >> meaninful on large many core systems.
> > 
> > Can we leave the non-oom related parts of procfs as-is for now, then
> > migrate them over to hpcc when that is available?  Safer that way.
> 
> Of course.
> 
> So AFAIU the plan is:
> 
> 1) update the oom accuracy fix to only use the precise sum for
>     the oom killer, no changes to procfs ABIs. This targets mm-new.
> 
> 2) update the hpcc series to base them on top of the new fix from (1).
>     Update their commit messages to indicate that they bring accuracy
>     improvements to the procfs ABI on large many-core systems, as well as
>     latency improvements to the oom killer. This will target upstreaming
>     after the next merge window, but I will still post it soon to gather
>     feedback.
> 
> Does that plan look OK ?

Perfect, thanks.  Except there is no "(1)".  We shall survive ;)