From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 2582E606A320 for ; Tue, 10 Nov 2026 22:35:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=PAta/XlA Received: by kanga.kvack.org (Postfix) id 3F8296B00EF; Tue, 10 Nov 2026 17:35:38 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 3827D6B05B0; Tue, 10 Nov 2026 17:35:38 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 225426B05B3; Tue, 10 Nov 2026 17:35:38 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id F154A6B00EF for ; Tue, 10 Nov 2026 17:35:37 -0500 (EST) Received: from smtpin17.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 8988EC018F for ; Tue, 10 Nov 2026 22:35:37 +0000 (UTC) X-FDA: 85420667514.17.6387A24 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf11.hostedemail.com (Postfix) with ESMTP id A832140005 for ; Tue, 10 Nov 2026 22:35:35 +0000 (UTC) Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b="PAta/XlA"; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf11.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1794350135; b=FpL7nMUqtblVctfk8IbcLy0vD1tNiASw+2ygbDzOvTS+DeYxTS2vQOY8vy7gLlRah+yvoW z5ptOTOU6hxZPGqkJP2wRxvx8k+qpnSP0MEVTqq0M7LWXBeVB4F6ztfz0PtUtPQFQB/1lr wv/RNudVYnHl+7mZEJWBRjHCVzisKu0= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1794350135; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=WUUdei9e97lDlcy3f/sZAzpE00dIzzVutyh3SNWyTyI=; b=ECyJpBWyPqU+m9TDUF5O63zhdYKMRtedPyF5m/u2VNHypxT9mf8iBeDhCweW00WDvtCdYH 2qO1iaT4FVPPNbxWPebO6AXYFKLjnBtwKA+pUzu0diJXyXmAvlK0s3xNvnKaaiGD1U6MjU G5Z6fgWnYjP7I1Y9IUfnwiXp3me1lcg= ARC-Authentication-Results: i=1; imf11.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b="PAta/XlA"; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf11.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id DB577458B0; Tue, 10 Nov 2026 22:35:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 083E01F008AB; Tue, 10 Nov 2026 22:35:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794350134; bh=WUUdei9e97lDlcy3f/sZAzpE00dIzzVutyh3SNWyTyI=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=PAta/XlAf5KTDd2yv4rcAqgfaYY3FVC82tN59/JriIBEANJRFOOl2e2qBr+2Hz8QQ xcA+4ranrOcQGshLRsJWdvWw7BfIBeC4h19GP1ywRJWCguqcRoWYpLAcmqQxqXtYzZ PwOPRL/dhzR6/bx8HQmIvgCn70YfpYKsrabVhVLj91kdR0cpCXxQWuA4YEtFMLShrR B2Eaos3aMi/6xchPZmkK5fYyzlbUyKqSkqZU5hMRoFROpVbGgzXgfd0tYyToM+dUEA djZ6l00kUkKE5aBFbZFCcwfENK1xr7e3NaXMWp7DtJXN/7hX0hWssnz1+T6mzFVKaX koeDy2MJPoQvA== Message-ID: <0ff8276d-9535-449a-94b0-912651411bfe@kernel.org> Date: Tue, 10 Nov 2026 23:35:25 +0100 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 5/6] mm: gup: introduce gup_unshared_pages() To: Yeoreum Yun , Rik van Riel Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Jason Gunthorpe , John Hubbard , Peter Xu , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Andrew Morton , Yuan-Hao Hsu 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> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: A832140005 X-Rspamd-Server: rspam12 X-Stat-Signature: 77ohyb8pp8a9xxxpk7np3fhgmrf8ogc1 X-Rspam-User: X-Spam-Status: No, score=-7.3 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,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=4.0.1 X-HE-Tag: 1794350135-768707 X-HE-Meta: U2FsdGVkX18BllAH4w4d1t1w8npR6MEdif0o+7GBSQiQoZu4PObnEEGQmZDEIN6s27DmD1fcQUMPzfnNbOjiBpP1irKiK3MM/e9RbuPQV9bAqZD+hfJHBoCiGYG+mR9dNy/D2idDCrGdY63Gs16mwGTe8LET4xrZizfXjQbj8shXuvB2ZqgUt0Cecrc/Vfe9P/T3nrW6qAIgsCdHeACKMaybmsRLChmZStv5pfTQRw9ZbZNKStIDCe+oj5aTl8UFCHdZYVbsULe691WV0qD9Wa7EHydIPfSyMJt+rcPOiSr8I7hJ7/8/P4fMvmCnVOOGCKl4jUiew1N/tNpUXzRHnNs7e36EhpOqLjBDd8qKA/1gFDIXCTLcN/uc/GDYWEVieJXjYwRXyGSsUbyOOfxiPQUDP6gX4+qzHAFVKsKBAwzcdHBZqBrO/tAVJ3MjLqerYMtITRyaRymYmy/7QEUWcvhyxRKKzbfhfkltzI5YaSaQzasrf7GBZyyqMaxv1E2mig1w2imB///hLPpp128jTY88L7AdQMqsx4kOMhFbtxJvgHS3n0yIDXDFPamWGsF+JlU9IfIR18khigrVZ4WTMVpNrrpJgeam2OHMkTa/aB33uVzg4gOw8aLyqCbf99h7sTJ4DVc85xglPruQsiSuZ2422h6B3CiDv8NhzLP3guM+DElGtj7KZzzicVjXPyV08EcjRVWeUUjA33Zm+AUKr6o9okS7fQ1EpSw+21wicis4udrwEFgWk7zJnbbSg5d6tEnWzVLaa9svNvcrdLOGoa6Zj7v3Gwal82uZfyeILctpN3In+sqRGY7gmxC8Wx6iu3XJOjeLl012QMZTsi7tKpBRn3xTubrsu+Oxr40sKNGxD6zZqn6cJe4TcXKuesWEcdsodmjYijthYq58pSsYt06mLaXSVnF6w4sVuHBoXrg/5GJkEaig5xKmMoWneHDnOem5uvd4qdxbCErwVVn /EkinNa0 DUeyoFVFasJWm14QuLyuuRAe72xNw49q1yOR9vG3b39sDA6FbGyWCvKZLb5TWBsgoTmILk7vmGP+xJ2Zmt48vAzZLhMJzWeX+ZOBFaJHoRoAoHKm2yqkLxw1vf76xuSTC6mUFn1nxsEwNi1JyY9OxrMNFTDrk4atVZt9lH0m/Rdgg088PFWo901goX00uCA7mB2z24wS0rBODU9Eqwkme6hckYWOfo6q+otYwLPpzbB4eDtEOmW0i4UDVu2Tj8AOuzm1NwEyb3+u0IFTubOrEFx7NST3nfpea4QmxBomgAeucUtaKdBV9xMIrddO65Mww5nl3OCm+UCwU/J7K9tvHglBJlSKWBdhifh/NBbwU9XcBLcLqnbxYT+0AZLb5htBLEVzDQb+X7ykmEQBb4z3PfnU3VGSkjbpInThwUjp83BEnBMIj4stl7I8ieUywoTH1zfbDWfHpIXSnEnM= 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 11/10/26 22:27, Yeoreum Yun wrote: > 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: >>> >>> 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. Let me think ... Maybe just throw in: gup_pages_not_requiring_unshare A bit long, but who cares -- Cheers, David