From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 028E930CDBC; Wed, 3 Jun 2026 07:08:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780470486; cv=none; b=HkEEoFEGidSATrJBKMJyjQAgwJpQYI4xO+U2xNlNF6+op3b4hEzZewhK6Bp2MsfP7pE8q10mjUK9ZwrkU/vU9SmZKu38wx4asiDNs2UaQPhqI/ISiMWasxR4A62DcmR6Jco7NeNmjsNUm04Jk2oBDDN/qzlfXhKTilLrMcfkcbQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780470486; c=relaxed/simple; bh=XlmdpT4JYV7meBHB+uyUg11V7gve6Af/lDfr6KlnYj8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=cPUcxBW1O/6V+OzwdNpsAFMQVZ/2tV6xJgtFaDdYvir36pf5yf2X2yvm6ffK4V/00i2x32cjEYRAo0QBFvwYBNSquyT7rKptryUFH6pbpSNG2LXJzNfFWnLh/QwoCRw/MkD4jMLj73gpIVvNimIMS81KrmuVYOLGGkTem3WE7fQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JD/8LfUI; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="JD/8LfUI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DE1AA1F00898; Wed, 3 Jun 2026 07:07:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1780470484; bh=XlmdpT4JYV7meBHB+uyUg11V7gve6Af/lDfr6KlnYj8=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=JD/8LfUIQTxpPOnSS0u744+AXlLaxoZwg1g6Lxrq/IjyJ4a7jp90chFnFzfLhkiF2 z+UQqmlEgng7WqTXUMORV2SyQGHVrlhnQ5TipVf7BUgk88Hgl3xXPueGfU5QfXk9WC Je+AIHwzRziAxWEuVjX7Rnkc0DBeccZd26lVTJ5BEFCjO7J/to+ne4mrXkVmqunex/ N/XY+RnCldJiFgc3QpYMj5jBaofMsY8ZYhe4RZuIGaDqh4hSoGTadyOgkW2vwnf8B+ 5TZOqSNKZRVwwe2s3AI9RQ0xXqWx95mEzshcJhZOHI8kVaXCI+l3+/GLnbRLPpJfQs /MGj0qzVLJVvQ== Date: Wed, 3 Jun 2026 08:07:49 +0100 From: Lorenzo Stoakes To: Barry Song Cc: Lance Yang , "catalin.marinas@arm.com" , "will@kernel.org" , "tglx@kernel.org" , "mingo@redhat.com" , "bp@alien8.de" , "dave.hansen@linux.intel.com" , "x86@kernel.org" , "akpm@linux-foundation.org" , "david@kernel.org" , "willy@infradead.org" , "sj@kernel.org" , "kees@kernel.org" , "luizcap@redhat.com" , "zhangjiao2@cmss.chinamobile.com" , "kas@kernel.org" , "hpa@zytor.com" , "liam@infradead.org" , "vbabka@kernel.org" , "rppt@kernel.org" , "surenb@google.com" , "mhocko@suse.com" , "jack@suse.cz" , "riel@surriel.com" , "harry@kernel.org" , "jannh@google.com" , "jgg@ziepe.ca" , "jhubbard@nvidia.com" , "peterx@redhat.com" , "ziy@nvidia.com" , "baolin.wang@linux.alibaba.com" , "npache@redhat.com" , "ryan.roberts@arm.com" , "dev.jain@arm.com" , "xu.xin16@zte.com.cn" , "chengming.zhou@linux.dev" , "nao.horiguchi@gmail.com" , "matthew.brost@intel.com" , "joshua.hahnjy@gmail.com" , "rakie.kim@sk.com" , "byungchul@sk.com" , "gourry@gourry.net" , "ying.huang@linux.alibaba.com" , "apopple@nvidia.com" , "pfalcato@suse.de" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "linux-mm@kvack.org" , "damon@lists.linux.dev" , "shakeel.butt@linux.dev" , "ryncsn@gmail.com" , "jparsana@google.com" , "dvander@google.com" Subject: Re: [PATCH 0/15] mm: introduce ANON_VMA_LAZY for deferred anon_vma creation Message-ID: References: <99dfc4a50f3643a6bef6deaeccfcf115@honor.com> <2e9175ab-f9be-44c6-bf1a-a82aeed18f98@linux.dev> Precedence: bulk X-Mailing-List: damon@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Wed, Jun 03, 2026 at 07:03:53AM +0800, Barry Song wrote: > On Tue, Jun 2, 2026 at 11:37 PM Lorenzo Stoakes wrote: > > > > On Tue, Jun 02, 2026 at 10:46:35AM +0800, Lance Yang wrote: > > > > > > > > > On 2026/6/2 10:15, Barry Song wrote: > > > > On Mon, Jun 1, 2026 at 9:46 AM wangtao wrote: > > > > [...] > > > > > > > > > > You said discussion was welcome, yet when someone offered even a > > > > > small comment, you refused to continue the discussion. > > > > > > > > > > If I had known you would be this inconsistent, I would not have > > > > > replied to you in the first place. > > > > > > > > > > This will be my last reply to you. I will not respond again. > > > > > > > > > > > > > Hi Tao, > > > > > > > > Please don't walk away from the linux-mm community. I read your > > > > patchset and found it quite valuable. It not only reduces memory > > > > overhead, but also eliminates rmap costs for exclusive folios. > > > > > > > > Since I'm not very confident discussing technical topics in English, > > > > I wrote a blog post in Chinese about your patchset: > > > > > > > > https://mp.weixin.qq.com/s/k00tzhTl8HbL3k4G6ev4SA > > > > > > > > I have to admit that I found the implementation quite complex and > > > > in need of significant improvement. However, I think the underlying > > > > idea is very interesting and worth exploring further. > > > > > > > > I'm looking forward to seeing a v2 RFC with a cleaner and simpler > > > > implementation while preserving the core concept. > > > > > > > > Regardless of whether it ultimately gets merged, I hope the discussion > > > > can continue. > > > > > > Same here :) > > > > > > Tao, please don't let this thread get you down. No first RFC is > > > perfect, and the idea still looks worth discussing :) > > > > > > Thanks for working on this! > > > > Guys, this isn't helpful. > > > > We aren't extending anon_vma, and I am working on replacing it, that's the > > bottom line. > > Not trying to challenge your bottom line. As explained to Harry, I > have no doubt about your expertise in rmap and many other mm > areas, and I deeply respect your work on rmap. Thanks I appreciate that. I don't mean to be 'mean' here, I'm only acting in what I feel are the best interests of mm and the kernel. > > With more discussion, we might gain additional insight and > inspiration. What Tao has inspired me with is the idea that if we > assume most real-world processes are leaf processes, could we > simplify parts of the design? Maybe I didn't express it clearly enough at LSF, but this is entirely a key point of my CoW context design :) It's true most stuff is leaf, and yes we can take advantage of this, and CoW context allows us to do it while also unravelling the issues with anon_vma. I am actually thinking of doing some incremental changes as part of my work possibly if I can. I maybe need to expedite that to bring some clarity to things here... > > This is why I suggested a v2, to improve the clarity of the cover > letter and make the code easier to understand, and to see whether > there is something worth considering further, even if it is not > suitable for merging. Right, I see. Again I'm really trying to tread a fine line here between the technical discussion and not pouring more and more time into a discussion that's not useful to me or the community. See [0] as to my reasoning on this :) [0]:https://lore.kernel.org/all/ah887A5VkXOcmq-g@lucifer/ > > > > > I have presented compelling evidence suggesting this is AI generated. In > > response I got more AI-generated nonsense. There's no trust, the code and > > analysis are all wrong, end of discussion. > > I am not an AI expert, and I do not really use AI in kernel work, > so I am not really sure what counts as AI versus non-AI. Sorry. No worries! > > > > > > > > > Cheers, Lance > > > > > > > Thanks, Lorenzo > > > > P.S. maintainership is utterly thankless, and I don't really expect much in > > return, but honestly reading this, given the case I've made here, was > > really quite disappointing. > > Understood. I see your position, and I personally have great > respect and appreciation for your work on maintenance. Sorry if > my words came across as disappointing. Thanks, appreciate it. And no worries! > > Best Regards > Barry Cheers, Lorenzo