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[2003:d8:2f32:c200:9add:4a7a:46aa:f740]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a073e461bfsm11544963f8f.79.2025.04.28.08.21.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 28 Apr 2025 08:21:12 -0700 (PDT) Message-ID: <67f83444-4d44-4ab8-950b-b41d69e5ec96@redhat.com> Date: Mon, 28 Apr 2025 17:21:11 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC] pin_user_pages_fast failure count increased To: Jaewon Kim , zhaoyang.huang@unisoc.com, jhubbard@nvidia.com Cc: surenb@google.com, linux-mm@kvack.org References: 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-MFC-PROC-ID: w897LEi3KNcWBporfJPkZwwNHc32NJLLjSMYKIcwgww_1745853674 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: E3BA580004 X-Rspamd-Server: rspam04 X-Stat-Signature: 6arrmpdw9d4t3ofr1mw8bpryo7jshpp4 X-HE-Tag: 1745853677-507541 X-HE-Meta: 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 WzbuXgMc 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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 28.04.25 17:17, Jaewon Kim wrote: > Hi Hi, > > If pin_user_pages_fast does not pin all the requested number of pages, > then drivers calling to pin_user_pages_fast should retry until the gup > pins all? It should continue from the first-not-pinned-one. If there is an error, it will be reported, otherwise it will make progress. > > Our GPU driver uses pin_user_pages_fast. > After the recent kernel update, pin_user_pages_fast sometimes does not > pin all the pages, nr_pinned < nr_pages. Yeah, that can happen as documented. -- Cheers, David / dhildenb