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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Andrew Morton , Yuan-Hao Hsu Subject: Re: [PATCH v3 5/6] mm: gup: introduce gup_unshared_pages() Message-ID: References: <20261109-refactor_gup_fast-v3-0-2aaef02df0e1@arm.com> <20261109-refactor_gup_fast-v3-5-2aaef02df0e1@arm.com> <7627c0d90188b581e7740bf8d17c8dd07b460f89.camel@surriel.com> <699499e46ace0875fd0f32052399e665c8209ea9.camel@surriel.com> <5db7a358c293393a93984ac3c3cc58e810edd75a.camel@surriel.com> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5db7a358c293393a93984ac3c3cc58e810edd75a.camel@surriel.com> X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,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: rspam07 X-Rspamd-Queue-Id: DEDFF4000A X-Stat-Signature: ge9mxaogx4sa9hwjfnt5sypofomygd39 X-Rspam-User: X-HE-Tag: 1794346030-913591 X-HE-Meta: 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 n0DStYa2 YKFVjGMAN7vU9PkflB4DDSfSq/Vvzff25A4l/Y02eypgfQg7XCD/HkJaeG9rn8n3ACnJx/c2XXebcWdblxUYNZLmSiQkQsYgWz3CrulNNpHrKCEyfnySQ7yfd9aPu100E+THLt3B2q4s1EVqOGNQwjqD1tXH6vjdXZOtCeTAq4VP5+AGqOldPIlRX49HakH97pV0oKF402Z5nPwOI1oDGlnWSDu3+zBTH48yzYWDiW/Y4kXlRjydMM5a0ATuG0UwpzCD02GyFbR4V21Kvw2PqhRLEgSM+SyWlyDiE 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 Tue, Nov 10, 2026 at 03:23:15PM -0500, Rik van Riel wrote: > On Tue, 2026-11-10 at 20:19 +0000, Yeoreum Yun wrote: > > On Tue, Nov 10, 2026 at 02:21:18PM -0500, Rik van Riel wrote: > > > On Tue, 2026-11-10 at 14:04 +0100, David Hildenbrand (Arm) wrote: > > > > > > > > So it's all about "number of pages that don't need unsharing". > > > > > > > gup_no_unshare_len() ? > > > > > > a little awkward sounding, but it describes > > > what it's doing? > > > > Hmm, Wouldn't this name be semantically much the same as keeping > > the existing gup_unshared_page(), since both essentially convey that > > no unsharing is required from GUP's perspective? > > The function measures how many pages in > this current interval do not need to be > unshared. > > I'm happy with any name, though. > > I would really like to just see this > code go in, so I can post my two > GUP series on top, first the batching > for the GUP-slow path, and then the > series that allows access_remote_vm() > and friends to work under the per-VMA > lock. @David, If you don't have any strong comments for original name -- gup_unshared_page(), May I post next version with resolving other comments so that Rik's series be posted soon? Otherewise, gup_skip_unshare_pages() works for me. -- Sincerely, Yeoreum Yun