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[85.23.51.1]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5a4185bc297sm6104200e87.18.2026.04.24.09.50.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 24 Apr 2026 09:50:38 -0700 (PDT) Message-ID: <3faef07e-5093-4d9f-bb1f-e9a1f2dc6100@redhat.com> Date: Fri, 24 Apr 2026 19:50:37 +0300 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 0/5] Migrate on fault for device pages To: Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, David Hildenbrand , Jason Gunthorpe , Leon Romanovsky , Alistair Popple , Balbir Singh , Zi Yan , Matthew Brost , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko References: <20260414041226.1539439-1-mpenttil@redhat.com> <20260424092336.7f8f5b0c00f4b46f9e0879d9@linux-foundation.org> Content-Language: en-US From: =?UTF-8?Q?Mika_Penttil=C3=A4?= In-Reply-To: <20260424092336.7f8f5b0c00f4b46f9e0879d9@linux-foundation.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 4/24/26 19:23, Andrew Morton wrote: > On Tue, 14 Apr 2026 07:12:21 +0300 mpenttil@redhat.com wrote: > >> From: Mika Penttilä >> >> Currently, the way device page faulting and migration works >> is not optimal, if you want to do both fault handling and >> migration at once. >> >> Being able to migrate not present pages (or pages mapped with incorrect >> permissions, eg. COW) to the GPU requires doing either of the >> following sequences: >> >> ... >> > Via which tree would it be best to upstream this? > >> include/linux/hmm.h | 19 +- >> include/linux/migrate.h | 26 +- >> lib/test_hmm.c | 101 ++- >> lib/test_hmm_uapi.h | 19 +- >> mm/Kconfig | 2 + >> mm/hmm.c | 821 +++++++++++++++++++++++-- >> mm/migrate_device.c | 589 +++--------------- >> tools/testing/selftests/mm/hmm-tests.c | 54 ++ >> 8 files changed, 1053 insertions(+), 578 deletions(-) > Looks like mm.git. > > It might be more useful to add it to a DRM tree if there's ongoing > development against this. But please no upstreaming without good > review! > > Anyway, this is a bit dated and Sashiko AI review wasn't able to apply > the patches. Nor was it able to apply v7 or v6. So please refresh, > retest, resend? It is against Linus tree v7.0, base-commit: 028ef9c96e96197026887c0f092424679298aae8, but applies and passes hmm selftests on mm trees as is. I plan to do v9 refresh and maybe minor updates in week or so. --Mika