From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 478D22BEFFE; Wed, 14 Jan 2026 01:35:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768354535; cv=none; b=IEITUacLJeaepfywqaOo9JYXCSMXcY6fgUmtnnUiK1qQVXjVj/8gE3TlqAavscUHV+l/ywt8eTOdsoGo+kqCqpANj7wPxQk0G1CPwKZ8bqC7MPERsyS2d8/tHxUCy+nMz13o2KCJt7X2UhYZvWAJb7rUUP80g+H8j76El1ffOcU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768354535; c=relaxed/simple; bh=6qALRjnUz1ToVYlX9uZ6rJccj/CbX4YXQwA1PWOPaaw=; h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References: Mime-Version:Content-Type; b=fUfS/YIxjzYbYofzG5vbTLPc0OvtsgTUlIHaptVZRIJRZqoHoS5AtHqgzREJ6TJ7Vog2KF+Nz/QRWjDZp3fmsGUt3Etq8KlknOFFKGCxn0qfcEQC5Y84PxRZaB1miONr/fkiPS411c5GNCIc/c6JFz6kIf8iDBoGJjub2WomfGs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=WFWinnB3; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="WFWinnB3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B68ADC116C6; Wed, 14 Jan 2026 01:35:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1768354534; bh=6qALRjnUz1ToVYlX9uZ6rJccj/CbX4YXQwA1PWOPaaw=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=WFWinnB350Gh+ZI0sjON+AkppzMI0aB6KQLZA9feNZIiAHT/+LubVU1LrZA37J23X cQZuJtW+NS4T/g7a4HJCKBxYSPJsaPzGO7XmOwtVTchOf0Dn/7ztycXSE+cMdw+Q81 wyfkoQ0v7Zk0vRCzU3NQ3xqTqxAq+7jBXMDO4Lts= Date: Tue, 13 Jan 2026 17:35:33 -0800 From: Andrew Morton To: Mathieu Desnoyers 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 . 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) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit 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 ;)