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Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pT770-009bbH-Lh; Fri, 17 Feb 2023 20:13:42 +0000 Date: Fri, 17 Feb 2023 20:13:42 +0000 From: Matthew Wilcox To: lsf-pc@lists.linux-foundation.org Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [LSF/MM/BPF TOPIC] Scalable Pagefaults Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Stat-Signature: 6t1rsbrd7a3dbwb51hm1sfxm8gg93pak X-Rspam-User: X-Rspamd-Queue-Id: 61E7A4001F X-Rspamd-Server: rspam06 X-HE-Tag: 1676664830-997195 X-HE-Meta: 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 Qx+AsBCI wV5R+Eymj+SY70RN8a7gopFdy+7q3/Wq8DEhCphNvQq7i/lD0rAJ1hCgFbhGVaaIxORXQ0TohJck3Iouu3DY+McjzhyDJV7qv5IUEC+PMUa5v/J5xTzs3SxqbRU0d0yGTspnpbq7dRrQriVMaJySSm6wft1AhfBXPQucTXNKVFxLSJMcgPGzwsHIY8kK5vkfKFRis5Tc7wdUk6miWVgOIi9NHISVM4rVSlA5TG83NJ0/FrXPSm6RLzSum8p3sxOlNwWkQKsjl5GydSgUgFMlNIQ6PBKgxv/n4aHpt1Q5PLa24TZJsFDRZBF8pTulbbc+JPoQh 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: We should continue the conversation from last year on the topic of page fault scalability. I presume that by the time of the conference Suren's current patches for per-VMA locks [1] [2] will be at least in Andrew's tree, even if not quite upstream yet. We will then be in a good place to discuss enhancements: - File-backed VMAs - UFFD - Swap - Improve performance for low-thread-count apps - Full RCU handling of (some) page faults Suren Baghdasaryan, Liam Howlett, Michel Lespinasse, Laurent Dufour, Peter Xu would all be good participants. [1] https://lore.kernel.org/linux-mm/20230216051750.3125598-1-surenb@google.com/ [2] https://lwn.net/Articles/906852/