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 CE83D2EDD70; Thu, 26 Mar 2026 13:42:45 +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=1774532565; cv=none; b=g0CdnYvHkk8q39Vlextf4mHtWYpakn3nFk1MS8nm4z5dOJB8JKGPMRplsfSiDZ4xo9Y4qGQFkzuJyGXdhTt5CGCOsZShoJJZH2Ul2XlqXXvpwzLIqV12AOEzCP4ENPecf8Cd3JJBRV+sTSvW8GRvXl4DuZ3IEJJR8Ks5RqGyL7g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774532565; c=relaxed/simple; bh=aqeaVyOgj2nhbWGaqNG8pdXcUvJ3CJyTuuyl/s9Mc8k=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=ISC1NXFZ7zfapwjOfy+StLd9wV1GRk3Pi3z8BWbaK1JYN4+d4udfPuEUSA+v9wc+hGB2TJwbfnRyiREayLq7O34UJ2Cd9m7q17KVQTC17HwFJj1qh8vuJHihnNVoi9Z+OUTJ6OQq7Ly2lQihrWKihOGGjZQDVevn8t1htZmorz8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=kV5ljdU2; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="kV5ljdU2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C4449C116C6; Thu, 26 Mar 2026 13:42:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774532565; bh=aqeaVyOgj2nhbWGaqNG8pdXcUvJ3CJyTuuyl/s9Mc8k=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=kV5ljdU2Wlclco25t1YBWfkmbtNb8y5Yi56M5iUA09lTbuQX6gK8atvoEY3qoPku/ UVfi34mtvWbnQ8f4MEPq+UdWzHEcHVC3df6ldOkrnV8We3h2oGHjGobdaN/B0fjgDD kz/x1kP7/HtIcvP9AmZZtDC8Q5F3naLPxqHX1Lzn+m9CSuYCh/4Y/BBndrfQbvpwD+ 8MCfggugpwG93/9MBrNYPJCKTEe98O20LnYwgTWLagqtpDz8x/THLxcYaULLgJ4w6a CTnat6u3U+wX98CDuB6VZjqa03cbOOYuFYUwtO86iQ+FNIVAcyqJjMZ+3ZU2Jafx37 kqFy5mXfAEDkw== Message-ID: Date: Thu, 26 Mar 2026 14:42:35 +0100 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [LSF/MM/BPF TOPIC] Towards Unified and Extensible Memory Reclaim (reclaim_ext) To: "Lorenzo Stoakes (Oracle)" , Kairui Song Cc: Michal Hocko , Andrew Morton , Shakeel Butt , lsf-pc@lists.linux-foundation.org, Johannes Weiner , Qi Zheng , Chen Ridong , Emil Tsalapatis , Alexei Starovoitov , Axel Rasmussen , Yuanchu Xie , Wei Xu , Matthew Wilcox , Nhat Pham , Gregory Price , Barry Song <21cnbao@gmail.com>, David Stevens , Vernon Yang , David Rientjes , Kalesh Singh , wangzicheng , "T . J . Mercier" , Baolin Wang , Suren Baghdasaryan , Meta kernel team , bpf@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20260325210637.3704220-1-shakeel.butt@linux.dev> <20260325190547.abb7309fb63473b57b7a90a0@linux-foundation.org> <67f1588e-a094-413c-9746-9c28bdf6cc56@lucifer.local> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <67f1588e-a094-413c-9746-9c28bdf6cc56@lucifer.local> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 3/26/26 14:13, Lorenzo Stoakes (Oracle) wrote: > On Thu, Mar 26, 2026 at 08:37:06PM +0800, Kairui Song wrote: >> On Thu, Mar 26, 2026 at 4:02 PM Lorenzo Stoakes (Oracle) wrote: >>> >>> >>> I'm quite concerned about maintainership, as it seems the MGLRU maintainers have >>> not been all that active, and the MGLRU to me at least is currently a black box. >>> >>> I'm not the only one who's raised this (see [0]). >>> >>> That'd very much have to be resolved and the community reassured that MGLRU is >>> _actively_ maintained before we could even contemplate it replacing the >>> 'classic' reclaim approach IMO. >>> >>> I hope that Kairu, Barry, Zicheng and others who are interested int it resolve >>> this, however! >> >> Hi everyone, >> >> Right, I think we are starting to make good progress on improving >> MGLRU recently. For the last few years we already have some commits >> stashed downstream to enable that on our fleet, most of my effort in >> upstream is spent on other parts like SWAP, really looking forward to >> making MGLRU better upstreamly. >> >> Yesterday I was still discussing with CachyOS folks about their usage >> while working on that series for MGLRU cleanup and dirty flush >> optimization, and got some nice feedback later from their chat server >> that MGLRU's TTL resolved their thrashing issue very well. With >> classic LRU they needed a le9 patch downtreamly. >> >> For many other typical workloads under stress, MGLRU performs >> significantly better too (e.g. database, build kernel could be more >> than twice as fast), it would be a huge loss to leave it unmaintained. >> >> Barry also provided some really helpful ideas about MGLRU like >> readahead handling. We are also seeing other vendors and people >> contributing to MGLRU like Leno and Baolin recently. Things are >> looking promising. > > Guys, can I please make a plea then for you guys to AT LEAST become > reviewers in MAINTAINERS please: > > MEMORY MANAGEMENT - MGLRU (MULTI-GEN LRU) > M: Andrew Morton > > Well Andrew is Andrew :) > > M: Axel Rasmussen > > git log mm/vmscan.c has 0 results. > > Axel has however engaged in discussion on > https://lore.kernel.org/linux-mm/20260318-mglru-reclaim-v1-0-2c46f9eb0508@tencent.com/ > recently for example, but not much in 2025 afaict. > > M: Yuanchu Xie > > git log mm/vmscan.c shows 1 result from August 13th 2024. > > Yuanchu has engaged in some MGLRU discussion also recently, here and there. > > R: Wei Xu > > git log mm/vmscan.c shows 2 results from October 2024. > > Wei doesn't look to have engaged in discussion on MGLRU recently. > > L: linux-mm@kvack.org > S: Maintained > W: http://www.linux-mm.org > T: git git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm > F: Documentation/admin-guide/mm/multigen_lru.rst > F: Documentation/mm/multigen_lru.rst > F: include/linux/mm_inline.h > F: include/linux/mmzone.h > F: mm/swap.c > F: mm/vmscan.c > F: mm/workingset.c > > It doesn't really feel like MGLRU is currently maintained at all, quite > honestly. > > So I think we need people to step up here. Ans some serious cleanup of the entry to reflect who is actually involved nowadays, if at all. Master of MAINTAINER updates, I assume you'll take care of that? -- Cheers, David