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(p200300d82f187500202eb0f176d6f9af.dip0.t-ipconnect.de. [2003:d8:2f18:7500:202e:b0f1:76d6:f9af]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a892e52a5asm14214194f8f.54.2025.07.01.12.38.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 01 Jul 2025 12:38:37 -0700 (PDT) Message-ID: Date: Tue, 1 Jul 2025 21:38:35 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 00/29] mm/migration: rework movable_ops page migration (part 1) To: linux-kernel@vger.kernel.org Cc: 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 , Harry Yoo , Qi Zheng , Shakeel Butt References: <20250630130011.330477-1-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: <20250630130011.330477-1-david@redhat.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: Z4YvR2u8S_nNEjnYT6eXe4xajevMUHH96kreDl_OpGc_1751398719 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 1998540005 X-Stat-Signature: 1kj96cx8a4z6c4frwfuhnrqayw6d7ynx X-Rspam-User: X-HE-Tag: 1751398723-832761 X-HE-Meta: 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 MgzwDjD0 CDDOwonAK3ndx5cBp+2vbUS6Y4rUDAjzJiWmjaphv/6ZGHWeksSm9HujS04wAuD1ujaryVLUcxKJ6XoKnRtvpnNy2r3x+/4arpBjesU5cRJdwOoAVKCmZQvLkK8+pWnpIa9AvgUfNkHVOmwEOFycvloQW4wgtcB7wf4ksS6EqqmXu7E+M4464qZbPCkGdw03hBahXs5kE8XL0czkWi7fFTGZfZGO2BH/LUWahA+ymMsnb9NbD8k4PyFWTR21YIQIoxrjvuuwSs/gBMvXfVPkJ/D5ZLAZA6zXVg3eqX8D5FbqTWqbdrO1IRWxEWj+M5/gkyRzaoDX6X+5jeYZWADiDu3S3cL6jP551xhNgad6q9PnuF9+PFxmfOTJm3hmRzg+N3huHmm5AR+pxfNO0faTv4EJhkVkrYN3SFTYcWu+yQdWGD348yNIB1VdumMgheC+pHD81CuUsJj3YB1rFS9j0lY8gq2m9kFjgzOqmeZ2Xc0jHEmYptl7WGUX0MTK+K4v0jtuUSKt1hEsFtlalKwKcgnS+pVhWfRixhtBXjkJBQlJ8KU75Z5MpG3L3CISlrPTo6KYhrizp2hPW/sY= 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 30.06.25 14:59, David Hildenbrand wrote: > Based on mm/mm-new. > > In the future, as we decouple "struct page" from "struct folio", pages > that support "non-lru page migration" -- movable_ops page migration > such as memory balloons and zsmalloc -- will no longer be folios. They > will not have ->mapping, ->lru, and likely no refcount and no > page lock. But they will have a type and flags :) > > This is the first part (other parts not written yet) of decoupling > movable_ops page migration from folio migration. > > In this series, we get rid of the ->mapping usage, and start cleaning up > the code + separating it from folio migration. > > Migration core will have to be further reworked to not treat movable_ops > pages like folios. This is the first step into that direction. > > Heavily tested with virtio-balloon and lightly tested with zsmalloc > on x86-64. Cross-compile-tested. Thanks everybody for the review! I'm planning on sending v2 probably later tomorrow, so we can get it into mm-new. So if someone wants to review parts of this series either (a) do it until tomorrow; or (b) scream STOP and I'll wait with v2 a bit longer; or (c) wait until v2. -- Cheers, David / dhildenb