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(p200300cbc7081500d5847ad8d3f75539.dip0.t-ipconnect.de. [2003:cb:c708:1500:d584:7ad8:d3f7:5539]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-432d54e2c8csm30059935e9.6.2024.11.13.08.42.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 13 Nov 2024 08:42:17 -0800 (PST) Message-ID: <07ba2a86-f22b-43aa-a542-f1a182656b63@redhat.com> Date: Wed, 13 Nov 2024 17:42:15 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 0/7] mm/mprotect: Fix dax puds To: Peter Xu , Jann Horn Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Kirill A . Shutemov" , Nicholas Piggin , Matthew Wilcox , Andrew Morton , James Houghton , Huang Ying , "Aneesh Kumar K . V" , Vlastimil Babka , Rick P Edgecombe , Hugh Dickins , Borislav Petkov , Christophe Leroy , Michael Ellerman , Rik van Riel , Dan Williams , Mel Gorman , x86@kernel.org, Ingo Molnar , linuxppc-dev@lists.ozlabs.org, Dave Hansen , Dave Jiang , Oscar Salvador , Thomas Gleixner References: <20240812181225.1360970-1-peterx@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-MFC-PROC-ID: YD5a-gQyf-5hztUvd3OwU6OSNtQ7mpukR42NXkWuV8M_1731516139 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 0AECA4001D X-Stat-Signature: itedet3hmyagren6kodqxijzfbuc5y3t X-Rspam-User: X-HE-Tag: 1731516088-259779 X-HE-Meta: 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 H2fr7JYJ uKYyrDxOlVk2agGYutwD4qw6LQKgMFgYOnHind8BppXwtUB76MZIxfdMYWiXh5C7mvw43ZSVm6Neo51QXcXeIq6/S7WsQ8pnmAcO+tyuMV2EmJ0fefnh6g1UZqa8pbz8+CTY6HP13WZrVtlNq1N1K+9ScFqfzbWK9GKxN1jhPX4NVacxCbY58Ow+YmiFVvqBZ+90yqtDq7VmtjQbYBQvx2LRtUaQ+KKkIk8knYSkJEYVb6aJrYnOPtguA2Vke9GMDYsCzKzv8wTIqK4lkrM02J/PZFEzOrpj7XYJiqU8IZEAXa8anyzAj08sc3b4fX6/7XmgmWUP6MPaxyqOocFVOMIb5G6laQiPRkFbE83yKQGw463kt8JvoiMOOXZ6e4PQyAQCZbynQ7XKc/HmHdAUKw2vnkwgX4KYBSQP5IVqn9sPRVof9DR0LcZRKdmr1+sp81UCE 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 13.11.24 17:39, Peter Xu wrote: > On Mon, Nov 11, 2024 at 10:20:59PM +0100, Jann Horn wrote: >> On Mon, Aug 12, 2024 at 8:12 PM Peter Xu wrote: >>> Dax supports pud pages for a while, but mprotect on puds was missing since >>> the start. This series tries to fix that by providing pud handling in >>> mprotect(). The goal is to add more types of pud mappings like hugetlb or >>> pfnmaps. This series paves way for it by fixing known pud entries. >> >> Do people actually use hardware where they can use PUD THP mappings >> for DAX? I thought that was just some esoteric feature that isn't >> actually usable on almost any system. >> Was I wrong about that? > > I did run it with a qemu emulated nvdimm device. Though in reality I've no > idea on how many people are using it.. I wonder if we still have to support it ... or could disable it+rip it out. -- Cheers, David / dhildenb