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Tue, 10 Nov 2026 08:58:14 -0500 (EST) Date: Tue, 10 Nov 2026 13:58:13 +0000 From: Kiryl Shutsemau To: "David Hildenbrand (Arm)" Cc: Linus Torvalds , Andrew Morton , Matthew Wilcox , Vlastimil Babka , Lorenzo Stoakes , Jan Kara , Hugh Dickins , Christian Brauner , Alexander Viro , Harry Yoo , Miklos Szeredi , Miaohe Lin , Naoya Horiguchi , Oscar Salvador , "Liam R. Howlett" , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Kairui Song , Qi Zheng , Shakeel Butt , Axel Rasmussen , Yuanchu Xie , Wei Xu , Baoquan He , "Paul E. McKenney" , Pedro Falcato , Luis Chamberlain , Ilya Gladyshev , Jaegeuk Kim , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, fuse-devel@lists.linux.dev, kernel-team@meta.com Subject: Re: [RFC PATCH v2 03/18] fuse: don't move a folio with PG_rcu_free into a fuse file Message-ID: References: <20261104130118.2507513-1-kas@kernel.org> <20261104130118.2507513-4-kas@kernel.org> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS autolearn=no autolearn_force=no version=4.0.1 X-Rspamd-Server: rspam09 X-Stat-Signature: tfqktt39riwh7dknhg3wknbat7xhsboi X-Rspamd-Queue-Id: C9F1820009 X-Rspam-User: X-HE-Tag: 1794319109-633418 X-HE-Meta: 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 dfX0FHP8 v4ENoqBdQU66qsSZ1+0UCM14bm6SxVFZx253svpqIA/+g8NDUVqwA5flVdHVArVxlEaL/Nv3f/8EtI9haQ8zYnC4n+LEJaqBqQ40FnbQD0SOv9KDuqfLqt02XRyKUiZEwcT5JLLZgeZNrcuG5DTiuMVGlQaL3U3ICtfwKgQnNr5Gyu8TsxrrcR2ObOfOalxNRM6Ul3/8lyoZtP7shVn3spO9fYHLqHYyxEVkxFe1HFfoDCZ1nCIrIvSS/SeYaA0wQD1+WQ0lIP1qlW6A22v+O9JYfNZMX8QJ7Ap5YFVJjBLdAeMRhyjAdXnHOrPpV21FM4p6or40O4ZVR2/SjaJfweNhuvoxZZpzon7AQAnFMLwp2Y2L/a7bkDwBxuyUZG6C4RpsPPuHxqTwUGhvXRQDmPik8EWFleZE5OZqvOFOVJ8eDW2dfu6IGG/MFdb21WFfa2/czSzEKr9GkJd9MTGKPjgWzdI1pECChvVGL5LT9E2O4njw= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Mon, Nov 09, 2026 at 06:48:39PM +0100, David Hildenbrand (Arm) wrote: > On 11/9/26 17:35, Linus Torvalds wrote: > > On Mon, 9 Nov 2026 at 08:28, Linus Torvalds > > wrote: > >> > >> On Mon, 9 Nov 2026 at 06:46, David Hildenbrand (Arm) wrote: > >>> > >>> Could we get rid of fuse_try_move_folio() entirely? > >> > >> Please. That would be great. > > > > .. and in a similar vein, we should get rid of splice doing the same entirely. > > > > Kirly's patch to just remove page_cache_pipe_buf_try_steal() entirely > > (ok, it was originally mine, but Kiryl took ownership of that series: > > "Tag, you're it") is worth doing, but I think worth doubling down on. > > I think we sh ould just get rid of 'try_steal' entirely. I don't think > > anybody really uses it. I think it exists in fuse and in the virtio > > console, and neither is worth it. > > > > Removing pipe_buf_try_steal() would basically remove all of > > fuse_try_move_folio(). > > > > Conversely, removing fuse_try_move_folio() would make > > pipe_buf_try_steal() even less useful than it is now. > > > > Just remove them both. Good riddance. > > Yes, that would be very nice. Agreed. I will post a separate series that removes ->try_steal and its users (fuse_try_move_folio(), virtio_console's pipe_to_sg()), with SPLICE_F_MOVE, SPLICE_F_GIFT and FUSE_SPLICE_MOVE left as no-ops, and drop patches 2-3 from this series on top of it. -- Kiryl Shutsemau / Kirill A. Shutemov