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[2003:cb:c723:b800:9a60:4b46:49f9:87f3]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3862294b1e3sm15641181f8f.109.2024.12.10.04.16.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 10 Dec 2024 04:16:26 -0800 (PST) Message-ID: <1a02554d-d7c1-4925-8180-a39bd6ecdd32@redhat.com> Date: Tue, 10 Dec 2024 13:16:24 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Removing page->index To: Claudio Imbrenda Cc: Matthew Wilcox , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-s390@vger.kernel.org References: <20241209183611.1f15595f@p-imbrenda> <023d1c53-783e-4d6d-a5e9-d15b9e068986@redhat.com> <20241210130420.534a6512@p-imbrenda> 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: <20241210130420.534a6512@p-imbrenda> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: SI9pTNjlwP3cc4DJDOVAet-0Uz_l6PaEG7ito_6c108_1733832988 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: B43234001A X-Stat-Signature: 78o9b5prarhfq6xd4p18xwap73xnfjai X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1733832965-774579 X-HE-Meta: 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 vP8mivtv daYJi7ur6byi9JScYRVcSrG1bhVn4YWkWY4ESZtyHLTdHNAuqlNpjEcZwzNM4/7tOm1QGEwRF+gaThIG9xp1WHEI7fBW2Medb9yD61OIV+s8W7343JMPQvAlPDJnHClQY8tM2r/2SGyR82mYWnLuVyyf1MJer0gSauSkJBNTTOYgqNn0FpgW0p0+wd+rusacG2xcRFBwVkQvv8sEVnW+4FSelmgzGzV8NOk4SEXj1NMa/4L0aT/2fxE02fRZtL/nQ9bErlceCXEovd4sent6h4EXVpSrAklabgZW36ZjlyLx/DCKx2VWMrezM02VJXzXcAcvAOgwXnqfrdFeEWO2x77kNM+wEjIWJjkklyhGsgkY92krYv0p1aeDiSZiZqU/VZCmC+juoe/4kzjZyIzomGWfkgU26bwTI+BVO X-Bogosity: Ham, tests=bogofilter, spamicity=0.162597, 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 10.12.24 13:04, Claudio Imbrenda wrote: > On Tue, 10 Dec 2024 12:05:25 +0100 > David Hildenbrand wrote: > >> On 09.12.24 18:36, Claudio Imbrenda wrote: >>> On Wed, 4 Dec 2024 16:58:52 +0100 >>> David Hildenbrand wrote: > > [...] > >>>> I know that Claudio is working on some changes, but not sure how that >>>> would affect gmap's usage of page->index. >>> >>> After I'm done, we won't use page->index anymore. >>> >>> The changes I'm working on are massive, it's very impractical to push >>> everything at once, so I'm refactoring and splitting smaller and more >>> manageable (and reviewable) series. >>> >>> This means that it will take some time before I'm done (I'm *hoping* >>> to be done for 6.15) >> >> Thanks for the information. So for the time being, we could likely >> switch to page->private. >> >> One question may be whether these (not-user-space) page tables should at >> some point deserve a dedicated memdesc. But likely the question is what > > maybe? but given that everything is changing all the time, I'm avoiding > any magic logic in struct page / struct folio. I think Willy wants to get rid of page->index in the next release, so any way to avoid the page->index usage in s390x is appreciated. page->private might be the low hanging fruit. If your approach is feasible in that time frame, it would also be great. -- Cheers, David / dhildenb