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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 . Howlett" , Mike Rapoport , Suren Baghdasaryan , Vlastimil Babka , Christian Brauner , Wei Yang , David Hildenbrand , Miaohe Lin , Al Viro , linux-mm@kvack.org, stable@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Yu Zhao , Roman Gushchin , Mateusz Guzik , Matthew Wilcox , Baolin Wang , Aboorva Devarajan Subject: Re: [PATCH v1 1/1] mm: Fix OOM killer and proc stats inaccuracy on large many-core systems Message-Id: <20260113173533.171248b2f6c11c536e4fc65a@linux-foundation.org> In-Reply-To: <162c241c-8dd9-4700-a538-0a308de2de8d@efficios.com> References: <20260113194734.28983-1-mathieu.desnoyers@efficios.com> <20260113194734.28983-2-mathieu.desnoyers@efficios.com> <20260113134644.9030ba1504b8ea41ec91a3be@linux-foundation.org> <20260113155541.1da4b93e2acbb2b4f2cda758@linux-foundation.org> <162c241c-8dd9-4700-a538-0a308de2de8d@efficios.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 6AC84C000D X-Rspamd-Server: rspam06 X-Stat-Signature: indk119jpdyo7r5ou3akupn3mwdyqqpr X-Rspam-User: X-HE-Tag: 1768354536-913948 X-HE-Meta: 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 UsyE7qgS Yt/1f6QR96rhw70gLt5F9MvzL9O4g0HKgo4ZlxPNCnsLoWugufA42uwS6MBqmSv+Wjssitkq7TbSEuSzBdy6DrLEVlrIHh21bzvfh/OdaBI/y3c+bjGvaRT5ddwBjHB3lTZivW8HAPV844eqGitarLSJWYSj993Sf270i5aG+Rzprk27sGUpY3TIVeCi3IJWbhBkkqi4BcFm3aVmRjg128aNnkt0LFWhU0RJ3Y2uAuMXpwvywdhexQtUPxiPdM3piB6OZ7KkJqkGMk1HJE4gJEq6zWUwvIKh7DdrkXyiGPvwhm6FfNhipZs/QABSXcT0tUGWyeCoNAKI9NsocTTh7DQDOJLqnQCURFCOpmRg0jSMtNg1ZxLe5Xkb7oG2U6FKtOUBF 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 Tue, 13 Jan 2026 20:22:16 -0500 Mathieu Desnoyers wrote: > 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 ? Perfect, thanks. Except there is no "(1)". We shall survive ;)