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[2003:d8:2f4a:5800:f1ae:8e20:d7f4:51b0]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-442cd32f2a8sm166268485e9.14.2025.05.12.06.01.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 12 May 2025 06:01:31 -0700 (PDT) Message-ID: Date: Mon, 12 May 2025 15:01:30 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] MAINTAINERS: add mm GUP section To: Zi Yan , Vlastimil Babka Cc: Lorenzo Stoakes , Uladzislau Rezki , Andrew Morton , Jason Gunthorpe , John Hubbard , Peter Xu , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20250506173601.97562-1-lorenzo.stoakes@oracle.com> <20250506162113.f8fa0c00e76722a1789ec56a@linux-foundation.org> <13a32f52-dc5c-45ef-b45a-585586868509@lucifer.local> <28428030-1178-469a-a4ab-f1e7179d9106@lucifer.local> <9AF9CF7D-D4A3-4D97-9B7D-F259E33E982C@nvidia.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: <9AF9CF7D-D4A3-4D97-9B7D-F259E33E982C@nvidia.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: uSaLrjwpXRg-NsOBmy1VdVmOEJ7vbryKdvdCx6Vnngc_1747054893 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: gdq9w5rejmfqsbj4awd3s6nbkt5hmc8j X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: D94C5C0019 X-HE-Tag: 1747054895-93949 X-HE-Meta: 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 ANJ2wvem 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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 12.05.25 14:54, Zi Yan wrote: > On 12 May 2025, at 3:38, Vlastimil Babka wrote: > >> On 5/8/25 14:23, Lorenzo Stoakes wrote: >>>> >>>> M for "PAGE ALLOCATOR", hmmm ..., I was hoping that Vlastimil might have >>>> capacity for that? :) >>> >>> Vlastimil? ;) >>> >>> I'd certainly support this. >> >> OK, can do, thanks. >> >>>> >>>> >>>> >>>> Not 100% sure what to do with >>>> >>>> * include/linux/page_isolation.h >>>> * mm/page_isolation.c >>>> >>>> (I hate the word "page isolation") >>>> >>>> They are mostly about page migration (either for alloc_contig... or memory >>>> hotunplug). Likely they should either go to the MIGRATION section or to the >>>> PAGE ALLOCATOR? Maybe MIGRATION makes more sense. Thoughts? >>> >>> I mean it explicitly relates to migrate type and migration so seems to me >>> it ought to be in migration. >>> >>> Though migrate type + the machinary around it is a product of the physical >>> page allocator (I even cover it in the 'physical memory' section of the >>> book). >>> >>> I wonder if our soon-to-be page allocator maintainer Vlastimil has >>> thoughts? ;) >>> >>> I'd vote for migration though to be honest. >> >> I checked the code briefly and although migratetypes are related to >> migration, it seems rather page allocator code to me. >> >> In fact if I didn't miss these files, I would have included them when >> proposing the PAGE ALLOCATOR section. >> Zi Yan has a series on that topic now and is one of the R: in PAGE >> ALLOCATOR. What do you think? > > I agree with Vlastimil that these two files belong to PAGE ALLOCATOR > section. Page isolation (actually should be pageblock isolation) is > doing work on pageblock migratetype, which IMHO is an important part > of anti-fragmentation mechanism for page allocation. IIRC, it's a bit confusing, because pageblock isolation as in mm/page_isolation.c does not have a lot to do with anti-fragmentation in reality. All of these functions should primarily be used for memory offlining + alloc_contig. (where we try page migration afterwards) Anyhow, I am fine as long as these files live somewhere related :) -- Cheers, David / dhildenb