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([2a09:80c0:192:0:5dac:bf3d:c41:c3e7]) by smtp.gmail.com with ESMTPSA id s16-20020adfea90000000b0034de587ffebsm12408414wrm.4.2024.05.07.01.09.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 07 May 2024 01:09:20 -0700 (PDT) Message-ID: <71903fc9-b64c-493f-b59c-35ec6ff3e4f9@redhat.com> Date: Tue, 7 May 2024 10:09:19 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Question regarding pinning of memory To: sunil bhargo , "linux-mm@kvack.org" Cc: "mounesh.b@gmail.com" References: <1076302825.4233137.1715068078694.ref@mail.yahoo.com> <1076302825.4233137.1715068078694@mail.yahoo.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: <1076302825.4233137.1715068078694@mail.yahoo.com> 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: 8bit X-Stat-Signature: fgn1tnuhrz9hi7hpfgmje4ws79yt7mq5 X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 0350E40018 X-HE-Tag: 1715069364-913350 X-HE-Meta: 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 MplQrmeJ 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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 07.05.24 09:47, sunil bhargo wrote: > Hi, >    We have written an application that would open a device and then > mmap it. >    In the kernel module the memory is allocated using vmalloc (don't > require contiguous physical memory)  and in mmap we are calling > remap_pfn_range to map the memory to user space. >    The question is would this mechanism be enough that the memory would > be pinned (neither swappable nor the page migration would happen) ? Recent related question: https://lore.kernel.org/linux-mm/ea59a8b7-6167-4ab1-92f2-f2a171310a50@redhat.com/T/ -- Cheers, David / dhildenb