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[2003:cb:c70c:e700:4d5c:81e2:253e:e397]) by smtp.gmail.com with ESMTPSA id x8-20020a5d4448000000b0031432f1528csm18383361wrr.45.2023.08.23.02.34.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 23 Aug 2023 02:34:34 -0700 (PDT) Message-ID: <8afa35bb-c3ed-c939-46a4-a9a277b6d4e2@redhat.com> Date: Wed, 23 Aug 2023 11:34:33 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 Subject: Re: [PATCH v1 0/3] udmabuf: Add support for page migration out of movable zone or CMA To: Jason Gunthorpe , "Kasireddy, Vivek" Cc: "dri-devel@lists.freedesktop.org" , "linux-mm@kvack.org" , Daniel Vetter , Mike Kravetz , Hugh Dickins , Peter Xu , Gerd Hoffmann , "Kim, Dongwon" , "Chang, Junxiao" References: <20230817064934.3424431-1-vivek.kasireddy@intel.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 3B0DF40008 X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: pdb69hb4qnmc3nx7phfj6bnng97f7f99 X-HE-Tag: 1692783278-848603 X-HE-Meta: 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 uDCgbxQY k0VupD1Z41pvFTKf0Gbu87LADCFhHt8B/EDTkymaueXohzE3y45iwadTGPjSf1EdzK3kGrEBq/q/XGLCDc5EPj5z1EZOnppqRnGmE5lMtDMuOaCapHbWr8yhmZuFrJduiEdVjMu2CU/SMhYOXD18vyIJLxQYE7OrdAk0tHFXcyYTe5SOPQVgA43hpIi9zH8rwsf1g7vxc+BjSO8rmDOcq9RStcFUmA/QA8iW34zkEbFTMN2bXTTowHey8lZx+fhAzVPapWEnvGPqG6ypOxAKEElJHQNUAoPoqXkgcfsIswZg0nzL9Mz1dkm8HvGLZr3hMySXgAtgLFh0ElwPiqdxAqqlvHWzc6uuP4LYpj0qk1Sw6a3pMjOP1VtUQuj99kj8y8sHu8GLaGmRgWPmvjvKsaUpCGjoJR9DHyHr+JTKXsNYBTiU= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: >> - Add a new API to the backing store/allocator to longterm-pin the page. >> For example, something along the lines of shmem_pin_mapping_page_longterm() >> for shmem as suggested by Daniel. A similar one needs to be added for >> hugetlbfs as well. > > This may also be reasonable. Sounds reasonable to keep the old API (that we unfortunately have) working. -- Cheers, David / dhildenb