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: <aWdRVY6Bzw2kjedk@tiehlicka>
Date: Wed, 14 Jan 2026 09:18:29 +0100
From: Michal Hocko <mhocko@...e.com>
To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, 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>, 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 13-01-26 20:22:16, Mathieu Desnoyers 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 ?

I was about to propose the same. 1) is a regression fix and should be
merged first and go to stable trees (it is a low priority fix but still
worth having addressed).

Also a minor nit. You do not have to send cover letter for a single
patch series.

Thanks for working on this Mathieu!

-- 
Michal Hocko
SUSE Labs