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: <162c241c-8dd9-4700-a538-0a308de2de8d@efficios.com>
Date: Tue, 13 Jan 2026 20:22:16 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: 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>,
 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 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 ?

Thanks,

Mathieu

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