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[2003:d8:2f49:7300:e2b8:a1d2:18a4:4f49]) by smtp.gmail.com with ESMTPSA id g11-20020a05600c4ecb00b004154f05f023sm1550523wmq.11.2024.03.29.04.42.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 29 Mar 2024 04:42:10 -0700 (PDT) Message-ID: <766cc37d-5115-43e3-95fe-4e193b631084@redhat.com> Date: Fri, 29 Mar 2024 12:42:09 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v12 0/8] mm/gup: Introduce memfd_pin_folios() for pinning memfd folios To: "Kasireddy, Vivek" , "dri-devel@lists.freedesktop.org" , "linux-mm@kvack.org" Cc: Matthew Wilcox , Christoph Hellwig , Andrew Morton , Daniel Vetter , Hugh Dickins , Peter Xu , Jason Gunthorpe , Gerd Hoffmann , "Kim, Dongwon" , "Chang, Junxiao" References: <20240225080008.1019653-1-vivek.kasireddy@intel.com> <205e0755-5dc8-45f7-8d9f-59dde9951307@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== 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-Stat-Signature: oj4ywt4ntbggxqs81a9zqikhkdf5t6mc X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 3C85A160004 X-Rspam-User: X-HE-Tag: 1711712537-610470 X-HE-Meta: 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 E0Pc6K9L 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 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: List-Subscribe: List-Unsubscribe: On 29.03.24 06:38, Kasireddy, Vivek wrote: > Hi David, > >> >> On 25.02.24 08:56, Vivek Kasireddy wrote: >>> Currently, some drivers (e.g, Udmabuf) that want to longterm-pin >>> the pages/folios associated with a memfd, do so by simply taking a >>> reference on them. This is not desirable because the pages/folios >>> may reside in Movable zone or CMA block. >>> >>> Therefore, having drivers use memfd_pin_folios() API ensures that >>> the folios are appropriately pinned via FOLL_PIN for longterm DMA. >>> >>> This patchset also introduces a few helpers and converts the Udmabuf >>> driver to use folios and memfd_pin_folios() API to longterm-pin >>> the folios for DMA. Two new Udmabuf selftests are also included to >>> test the driver and the new API. >>> >>> --- >> >> Sorry Vivek, I got distracted. What's the state of this? I assume it's >> not in an mm tree yet. > No problem. Right, they are not in any tree yet. The first two mm patches that > add the unpin_folios() and check_and_migrate_movable_folios() helpers still > need to be reviewed. > >> >> I try to get this reviewed this week. If I fail to do that, please ping me. > Ok, sounds good! .. as it's already Friday (and even a public Holiday today+Monday here), let me prioritize this for next week! -- Cheers, David / dhildenb