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t=1679596101; bh=kS4QCJSMCNDollXGvp0RzZF6acVQqFtL4hH9JS9ujd4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=eT2t2GgjVJpJ1g1YaNE/0P2L7vS7/UTD3eRcC0jWBgW66M6j/A5A8+egteSWfdTm1 jJvEWkv5vgNI7okjTfNWm/JIMSf/RqKLou4H69msrriomAsY3vimW7RPq2KRRQpm0i fjmtEr+ZuExh0pwM5MBE+cO/Ryc1jI0/Adp2i3z0YTQDk9PQUbr6ZLZbD3TinLys5R 4khYlpWcCewhZZ+NKQcHSfrcZpttYXp0oskfuOKvpS3vep2uGxZsZsWv9W94Iqvzfh C56Wx0UGmsjo7kfQJkzQCHdZabWO0p8ptF45glcHWGlSTTvIEkjoplp7XLY9ZYSUo7 IHjh5+kMfrQ8g== Date: Thu, 23 Mar 2023 11:28:18 -0700 From: Chris Li To: "Huang, Ying" Cc: Yosry Ahmed , lsf-pc@lists.linux-foundation.org, Johannes Weiner , Linux-MM , Michal Hocko , Shakeel Butt , David Rientjes , Hugh Dickins , Seth Jennings , Dan Streetman , Vitaly Wool , Yang Shi , Peter Xu , Minchan Kim , Andrew Morton , Aneesh Kumar K V , Michal Hocko , Wei Xu Subject: Re: [LSF/MM/BPF TOPIC] Swap Abstraction / Native Zswap Message-ID: References: <87o7ox762m.fsf@yhuang6-desk2.ccr.corp.intel.com> <87bkkt5e4o.fsf@yhuang6-desk2.ccr.corp.intel.com> <87y1ns3zeg.fsf@yhuang6-desk2.ccr.corp.intel.com> <878rfothdg.fsf@yhuang6-desk2.ccr.corp.intel.com> <871qlgrm5j.fsf@yhuang6-desk2.ccr.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <871qlgrm5j.fsf@yhuang6-desk2.ccr.corp.intel.com> X-Rspam-User: X-Rspamd-Server: rspam03 X-Stat-Signature: 6rqp1yjunuqgynszx3r7ayk6faz5xkze X-Rspamd-Queue-Id: 6DA5218000D X-HE-Tag: 1679596104-803451 X-HE-Meta: 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 mpvSJjEP 7m9RkX5bfeXmWBUbiCR5bH/cJP5CgD/NjszVMwvk9TxNAoZCLqDozCPVo9UXND84oyjBwZZoTzrurc9sdpTW+dgBqaJPRHgzaK3MrqbGfAWDfu4KZw9ITdp5VOK/ECpMVTsrINPWOfBeBCe251PjWWhoe8bRaD3Rv8Ynz 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: On Thu, Mar 23, 2023 at 02:56:24PM +0800, Huang, Ying wrote: > > > > Let's assume the swap entry in device A has more than one user. > > e.g. Swap entry A1 on device A is shared by three different > > process. It is installed in three PTE locations. > > With indirection, the swap ID (swap_desc index) will be installed in > PTEs instead of the swap entry itself. Thanks for the clarification. If we have swap_desc index in the PTE, let's call it S1. I assume S1 will contain A1 and B1 as part of the swap_desc struct. Now we are getting to some very interesting details. What is the life cycle of the S1? Does S1 share the same index as A1? Chris