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(p200300d82f3f4b00ee138c225cc5d169.dip0.t-ipconnect.de. [2003:d8:2f3f:4b00:ee13:8c22:5cc5:d169]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-429952b79absm14855116f8f.3.2025.10.27.09.15.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 27 Oct 2025 09:15:21 -0700 (PDT) Message-ID: Date: Mon, 27 Oct 2025 17:15:19 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 05/12] fs/proc/task_mmu: refactor pagemap_pmd_range() To: Jason Gunthorpe , Gregory Price Cc: Lorenzo Stoakes , Andrew Morton , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Sven Schnelle , Zi Yan , Baolin Wang , "Liam R . Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Kemeng Shi , Kairui Song , Nhat Pham , Baoquan He , Chris Li , Peter Xu , Matthew Wilcox , Leon Romanovsky , Muchun Song , Oscar Salvador , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jann Horn , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Ying Huang , Alistair Popple , Pedro Falcato , Pasha Tatashin , Rik van Riel , Harry Yoo , kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org References: <2ce1da8c64bf2f831938d711b047b2eba0fa9f32.1761288179.git.lorenzo.stoakes@oracle.com> <76348b1f-2626-4010-8269-edd74a936982@lucifer.local> <3f3e5582-d707-41d0-99a7-4e9c25f1224d@lucifer.local> <20251027161146.GG760669@ziepe.ca> 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 ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20251027161146.GG760669@ziepe.ca> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: YYDeCRlUkFlZYTorUCxxAoposCZQ5Iq_MjBlqElIAkY_1761581723 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: EA24AC0003 X-Rspamd-Server: rspam11 X-Rspam-User: X-Stat-Signature: 8zewzqi8x358ycggrie88c8orsqxxs5p X-HE-Tag: 1761581726-8848 X-HE-Meta: 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 M5xolyJS 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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 27.10.25 17:11, Jason Gunthorpe wrote: > On Fri, Oct 24, 2025 at 04:37:18PM -0400, Gregory Price wrote: >> On Fri, Oct 24, 2025 at 09:15:59PM +0100, Lorenzo Stoakes wrote: >>> On Fri, Oct 24, 2025 at 03:12:08PM -0400, Gregory Price wrote: >>> >>> So maybe actually that isn't too bad of an idea... >>> >>> Could also be >>> >>> nonpresent_or_swap_t but that's kinda icky... >> >> clearly we need: >> >> union { >> swp_entry_t swap; >> nonpresent_entry_t np; >> pony_entry_t pony; >> plum_emtry_t beer; >> } leaf_entry_t; >> >> with >> >> leaf_type whats_that_pte(leaf_entry_t); > > I think if you are going to try to rename swp_entry_t that is a pretty > good idea. Maybe swleaf_entry_t to pace emphasis that it is not used > by the HW page table walker would be a good compromise to the ugly > 'non-present entry' term. Something like that would work for me. -- Cheers David / dhildenb