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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> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: E06E840009 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-Stat-Signature: qgb5yk69pwyrbmmgtau7s7xet4619n9d X-HE-Tag: 1794319139-650447 X-HE-Meta: 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 EWREZyjx IVPvVONFUpyHt2MW4DX+vNgAe/D1ahHtS89g1EHQboWK9TK3v1EgzsZdW3QHe7fAdhz2Jl3QIBM1xcFu3rqVEJqYyzcL1mS2lZaIZ6ZMVCXLJYqLZ8kHhXzrMAgirQGG6AutYln1NC7WysEvbkv10tm4HOpET0J4TgP8EZGjMB6KVaNLtLLJeFuNmy3PNQ4JhWKRBOOCTHefqsx7xnoABY81DWynMg2bgyKxXWzFklkHMoB1g7nmp6yFfSF3bbOceFpDAgIb3lSD2r/L1QWdDkUUDn1Ltg7CPhrYZ 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 02:04:43PM +0100, David Hildenbrand (Arm) wrote: > On 11/10/26 10:58, Yeoreum Yun wrote: > > Hi Rik, > > > >> On Mon, 2026-11-09 at 12:32 +0000, Yeoreum Yun wrote: > >>> This is preparatory patch to make gup_fast_pte_range() batchable. > >>> > >>> Introduce gup_unshared_pages() to count consecutive pages within a > >>> folio > >>> that do not require unsharing, and use it to implement > >>> gup_must_unshare(). > >>> > >> Could gup_exclusive_pages() be a better name? > > > > Yes. This seems much better for me. I'll change it in next-spin. > > Not quite the right semantics. For pagecache folios we simply don't need > unsharing in MAP_SHARED VMAs. That does not imply that these are exclusive. > > So it's all about "number of pages that don't need unsharing". > > Any idea for a fitting name ? :) Might gup_pages_without_unshared()..? otherwise I couldn't image better name than origin... -- Sincerely, Yeoreum Yun