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([2a09:80c0:192:0:5dac:bf3d:c41:c3e7]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a88c7e76e1sm16577247f8f.16.2025.07.02.07.52.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 02 Jul 2025 07:52:56 -0700 (PDT) Message-ID: Date: Wed, 2 Jul 2025 16:52:53 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 27/29] docs/mm: convert from "Non-LRU page migration" to "movable_ops page migration" To: Harry Yoo Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, virtualization@lists.linux.dev, linux-fsdevel@vger.kernel.org, Andrew Morton , Jonathan Corbet , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Jerrin Shaji George , Arnd Bergmann , Greg Kroah-Hartman , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?Q?Eugenio_P=C3=A9rez?= , Alexander Viro , Christian Brauner , Jan Kara , Zi Yan , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , "Matthew Wilcox (Oracle)" , Minchan Kim , Sergey Senozhatsky , Brendan Jackman , Johannes Weiner , Jason Gunthorpe , John Hubbard , Peter Xu , Xu Xin , Chengming Zhou , Miaohe Lin , Naoya Horiguchi , Oscar Salvador , Rik van Riel , Qi Zheng , Shakeel Butt References: <20250630130011.330477-1-david@redhat.com> <20250630130011.330477-28-david@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: WN7HEJ6-j73ubEwKMcxgW3J5vddGbVmyN6OJ0kQkfgQ_1751467978 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-Server: rspam04 X-Rspamd-Queue-Id: B83CF4000D X-Stat-Signature: qpo37d6kr83fmput376h6msad3sez31j X-HE-Tag: 1751467981-998955 X-HE-Meta: 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 68I2jFO6 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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 02.07.25 16:23, Harry Yoo wrote: > On Mon, Jun 30, 2025 at 03:00:08PM +0200, David Hildenbrand wrote: >> Let's bring the docs up-to-date. >> >> Reviewed-by: Zi Yan >> Signed-off-by: David Hildenbrand >> --- >> >> +movable_ops page migration >> +========================== >> + >> +Selected typed, non-folio pages (e.g., pages inflated in a memory balloon, >> +zsmalloc pages) can be migrated using the movable_ops migration framework. >> + >> +The "struct movable_operations" provide callbacks specific to a page type >> +for isolating, migrating and un-isolating (putback) these pages. >> + >> +Once a page is indicated as having movable_ops, that condition must not >> +change until the page was freed back to the buddy. This includes not >> +changing/clearing the page type and not changing/clearing the >> +PG_movable_ops page flag. >> + >> +Arbitrary drivers cannot currently make use of this framework, as it >> +requires: >> + >> +(a) a page type >> +(b) indicating them as possibly having movable_ops in page_has_movable_ops() >> + based on the page type > >> +(c) returning the movable_ops from page_has_movable_ops() based on the page >> + type > > I think you meant page_movable_ops()? Very right, thanks! -- Cheers, David / dhildenb