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Wed, 14 Jan 2026 01:22:18 +0000 Message-ID: <162c241c-8dd9-4700-a538-0a308de2de8d@efficios.com> Date: Tue, 13 Jan 2026 20:22:16 -0500 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 1/1] mm: Fix OOM killer and proc stats inaccuracy on large many-core systems To: Andrew Morton Cc: linux-kernel@vger.kernel.org, "Paul E. McKenney" , Steven Rostedt , Masami Hiramatsu , Dennis Zhou , Tejun Heo , Christoph Lameter , Martin Liu , David Rientjes , christian.koenig@amd.com, Shakeel Butt , SeongJae Park , Michal Hocko , Johannes Weiner , Sweet Tea Dorminy , Lorenzo Stoakes , "Liam R . 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 1RQfxBxI 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2026-01-13 18:55, Andrew Morton wrote: > On Tue, 13 Jan 2026 17:16:16 -0500 Mathieu Desnoyers 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