linux-kernel - Re: [RFC PATCH v7 2/2] mm: Fix OOM killer inaccuracy on large many-core systems

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Message-ID: <ahtgrrgn4uwqjumr2blnnhyykow77weu3iuk2wqiimjhq4yset@5o3wls37n5pp>
Date: Fri, 7 Nov 2025 16:01:58 -0800
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: kernel test robot <oliver.sang@...el.com>, oe-lkp@...ts.linux.dev, 
	lkp@...el.com, Andrew Morton <akpm@...ux-foundation.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>, SeongJae Park <sj@...nel.org>, Michal Hocko <mhocko@...e.com>, 
	Johannes Weiner <hannes@...xchg.org>, Sweet Tea Dorminy <sweettea@...gle.com>, 
	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>, 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>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
	linux-trace-kernel@...r.kernel.org, christian.koenig@....com
Subject: Re: [RFC PATCH v7 2/2] mm: Fix OOM killer inaccuracy on large
 many-core systems

On Fri, Nov 07, 2025 at 11:04:01AM -0500, Mathieu Desnoyers wrote:
> On 2025-11-07 10:53, Mathieu Desnoyers wrote:
> [...]
> > 
> > It would make sense to call an explicit percpu counter tree init
> > function from start_kernel() between the call to mm_core_init() and the
> > call to maple_tree_init(). This way it would be initialized right after
> > mm, but given that the hierarchical counter tree is a lib that can be
> > used for other purposes than mm accounting, I think it makes sense
> > to call its init explicitly from start_kernel() rather than bury
> > it within mm_core_init().
> See the following diff. If nobody object, I'll prepare a v8 which
> includes it.

This seems reasonable to me, I see v8 is already posted. I will take a
deeper look.