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[89.27.86.246]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-3a64c2ea5d2sm5510451fa.18.2026.09.25.06.22.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 25 Sep 2026 06:22:18 -0700 (PDT) Message-ID: Date: Fri, 25 Sep 2026 16:22:17 +0300 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v15 00/11] migrate on fault for device pages To: Jason Gunthorpe Cc: Christoph Hellwig , linux-mm@kvack.org, dri-devel@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-kernel@vger.kernel.org, David Hildenbrand , Leon Romanovsky , Alistair Popple , Balbir Singh , Zi Yan , Matthew Brost , Andrew Morton , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko References: <20260924065313.899730-1-mpenttil@redhat.com> <65c5c412-56a7-46a9-b22b-22077a8e9727@redhat.com> <20260925124737.GL9354@nvidia.com> From: =?UTF-8?Q?Mika_Penttil=C3=A4?= In-Reply-To: <20260925124737.GL9354@nvidia.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: pW1mSfm2G-qIuE_ps_IZ5Q45ZrLL-5TI67lwF6p2sKQ_1790342542 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 146A1A000C X-Stat-Signature: yoeqfoi7yubprwqethkfa9rxrjk3sfa6 X-HE-Tag: 1790342544-48494 X-HE-Meta: U2FsdGVkX18BEWghYfg/FpDXE3NloHlG4DKy4iAU+bChXSkCk4B7O8fOk/AzAifqP1rvmM3IvuwY9eaEMKDLZo4VAA/4BxpLQlW24/QW3SdmtbGdcA5ckzBQNuoqCvpnZj37ooG/Py80KJI7oSWZewetFpPuZ9ZZwbcLuHwpvVEDvGAQCYoQ8elbKOL9jnee0TX7cUzMwrmNbGnCM/53KD2chBFXknCBchue6U/nNRAYq3CW0OrHO1GxpEsognJjC175EPz3S45ezGT4NHTRL57kN4oWggxDXqyQGYwpkAAPRgLV8vEakgV2jQ6B4En4axTzh9pwhZpCi3UP/WuVSqz/mdyJpimJ5atL3wUX+Hdx27SAWRYCr+oMrs5EasaQDrbwKdaGONL0CEJB1DVk/by9RJUJSzrzkpOwY+GrBRtr+gP4OXib+XA+lyvSW1kJBvnCf9znE1qhc1tH766s2uxvJyKZc9VSWWMgi1Z8uJAzm0EQloN7ahfCKXp95XXKKgCBvIuqLi1FYa2MuNjAPrAfMxa8jzGvtuwBuJeZzuC6U2lbJ6etV0OKkD1Fw0Gj2RvEBX1dJE9gpIJLa6OLySeqHL5jHGkCpDtPUpmzwBX1NfETX2v4Zfoy1SlVnlpBudntgLxbTtnNLIQuXFQrcKNmQpFJeZ4DDa85LXG69LG0AD/BaRD99WifI0ewCFzvVpCFEyi3KUtxlKnjLPj71QXhVcfsTB2su2C4Wqpafk9atLt025FRd5nIZCp5FhgJRuelrgtrGPL/E1K1wPQ/wKBfhZwVlGkAprcgY6XemJ4NppJZIjnZEgb4xXUkHBEpeiHo0F4uyb0g0PD8yDQvmjH3FzNmrym+g9hzuJoA0U71Yr6/hIM7jbv8UfsaXlWn1RYIsSx1UqnFp3O81JEtX/uoGS62amMua/g/mG0ia5+Qf+pnfy1v5Qfn0q0fdKmpO7YQ6XxYNPPa5I46Mt/ RUd/2bEx CDLGkR+KmltlPfYmzDI8x/LufWn0Ej30WpiZ7F1jL9QqgCEyWxjfpWzmcQQ53xa3qvO/a9qJeEejTMYZzLoR4O/M1tzo6v+PL6zEc3IJAXyzEoYra0deZ0k/x6xpNlKsoHrZmYrO3XgaSKxZNl9975FdH3gnIvAR5zISNbdaSd8NXAG7AcfZwKDhcqlu6llkwlrO3rF1FODELfM6hgI1/8BoeDNf/OY7oYcuewL0HyekZu2Unlz2KTE6QhKDODT+P2/I/XEhNEeRQztAngQ1POTmZxx+Zv+7mwac8X1BfB65MDSh9FNzF+KmZ0dfoAxCB2hb++llhETrDV00S6Choia4XTVM6B/GL9PvYCw4oheLpGHvVUM4pn9r8NcGH2QCohjM0H4gClFZw9ND63fGU7LE6bSRuLZiJ/VhyzWiADR55YAn4DCjJ/2i5Bzwibhy52/wWp5XpaiX4rp70b2Co324teQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/25/26 15:47, Jason Gunthorpe wrote: > On Fri, Sep 25, 2026 at 01:23:52PM +0300, Mika Penttilä wrote: >> On 9/25/26 12:07, Christoph Hellwig wrote: >>> Who is going to use this? The series seems to lack an actual user >>> for it. >> Two users: For one, existing migrate_vma_setup() callers, unchanged. >> The series reworks migrate_vma_setup() to collect via >> hmm_range_fault() internally (it sets HMM_PFN_REQ_MIGRATE and calls >> migrate_hmm_range_setup(), mm/migrate_device.c). So every in-tree >> migrate_vma consumer — nouveau, amdgpu/amdkfd, drm/xe via >> drm_pagemap, lib/test_hmm — runs on the new path. > So split the series so you don't add unused interfaces for now? Jason I think we get the other for "free", migrate_vma_setup() -> hmm_range_fault() is the now used. But if wanted you can drive the migration initially from  hmm_range_fault()  also from fault handler. If don't want that then it's removing  EXPORT_SYMBOL(migrate_hmm_range_setup); --Mika