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Fri, 25 Sep 2026 13:21:02 -0700 (PDT) Date: Sat, 26 Sep 2026 04:20:51 +0800 From: Kairui Song To: Shakeel Butt Cc: Chris Li , Nhat Pham , Rik van Riel , Baoquan He , Kairui Song , Johannes Weiner , Michal Hocko , Roman Gushchin , Yosry Ahmed , David Hildenbrand , Muchun Song , Kemeng Shi , Barry Song , YoungJun Park , Chengming Zhou , "Lorenzo Stoakes (Oracle)" , "Liam R. Howlett" , "Vlastimil Babka (SUSE)" , Mike Rapoport , Suren =?utf-8?B?QmFnaGRhc2FyeWFu77+8?= , Qi Zheng , Axel Rasmussen , Yuanchu Xie , Wei Xu , Gregory Price , Wenchao Hao , Jonathan Corbet , Hugh Dickins , Baolin Wang , Tejun Heo , Michal =?utf-8?Q?Koutn=C3=BD?= , Shuah Khan , Kunwu Chan , Meta kernel team , Linux Memory Management List , Linux Kernel Mailing List , linux-doc@vger.kernel.org, "open list:CONTROL GROUP - MEMORY RESOURCE CONTROLLER (MEMCG)" , Andrew Morton , Joshua Hahn Subject: Re: Path forward for Virtualized Swap? Message-ID: References: <7ee199ddee81bf8026688def82f78ad9db09be9e.camel@surriel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 7B93280008 X-Stat-Signature: cqbszfdubouaet6pqx7x6h1jmchibiax X-HE-Tag: 1790367664-493732 X-HE-Meta: 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 eq/8LRH1 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Sep 25, 2026 at 12:36:46PM +0800, Shakeel Butt wrote: > On Fri, Sep 25, 2026 at 09:15:17PM +0800, Kairui Song wrote: > [...] > > Thanks Kairui for very clear description of what you want and looking for. > After reading your email, I think you want memsw support in v2. Currently you > somehow are implementing memsw using memory.current and memory.swap.current. > (I am assuming you need to subtract swapcache to avoid double counting.) > To conclude, you want to use vswap (the aim is it to default) but you still want > your way to implementing memsw keep working. > > Please correct me if I missed something. > > I am wondering if you really want memsw, why not propose memsw. Someone from > tencent proposed memsw [1] previously, so why not continue that effort? I am > pretty sure folks from Google (people who actually work on prodkernel there) > will be happy to collaborate with you on that. Hi Shakeel, Right, I believe it is still being proposes as you can see there are some previous progress, year that work need updated, let me try to do something about it. > > [1] https://lore.kernel.org/20250319064148.774406-1-jingxiangzeng.cas@gmail.com/ > > Setting aside the memsw conversation, I think we should go back to the actual > vswap conversation and list down what we agree on and where we still need > discussion and decision. (I will take a stab at it and start a separate thread > but still on this email and will use AI for the summary.) Right, the things here is that I think it's not hard to see that memory.current / memory.swap and memsw (if in V2) is tangled with each other so I'm hope we won't create blocker for the future.