linux-kernel - Re: [PATCH v10 2/3] mm: Fix OOM killer inaccuracy on large many-core systems

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Message-ID: <2a772584-2269-4008-809a-6123e226ebe3@sirena.org.uk>
Date: Fri, 19 Dec 2025 09:31:10 +0000
From: Mark Brown <broonie@...nel.org>
To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Thomas Gleixner <tglx@...utronix.de>,
	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>, 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>,
	Aishwarya TCV <Aishwarya.TCV@....com>
Subject: Re: [PATCH v10 2/3] mm: Fix OOM killer inaccuracy on large many-core
 systems

On Thu, Dec 18, 2025 at 05:18:04PM -0500, Mathieu Desnoyers wrote:
> On 2025-12-18 13:00, Mark Brown wrote:

> An ugly work-around that may work (and then we can improve on this),
> at the end of mm/init-mm.c:init_mm (completely untested):

>        .cpu_bitmap     = { [0 ... ((3*BITS_TO_LONGS(NR_CPUS))-1 + ((69905 * NR_MM_COUNTERS * 64) / BYTES_PER_LONG))] = 0UL },

That doesn't seem to fix the FVP unfortunately (BYTES_PER_LONG doesn't
exist, but even just deleting the division entirely fails in the same
way).

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