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[2003:cb:c70b:e100:38d6:8aa1:11b0:a20a]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-385faec0c9dsm6142889f8f.20.2024.12.04.07.58.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 04 Dec 2024 07:58:54 -0800 (PST) Message-ID: Date: Wed, 4 Dec 2024 16:58:52 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Removing page->index To: Matthew Wilcox , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Cc: linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-s390@vger.kernel.org, Claudio Imbrenda References: 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: -bft_R2NG8mN5BotOCXvP39dsGtqZ1-0KW_9eceyO-E_1733327936 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: ABE632001D X-Stat-Signature: s885tnbro59imtkmh3qh15xd1rbxquh6 X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1733327932-306441 X-HE-Meta: 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 Vc2BP71Q bS2Il/vtS23X0o1N/hx7mPMccSILig54g6OQ7DZ+DfXGfsFo4lgm4W5o8p4kXDm0h/XOyXLmISAsIJgTLMqa0YEKU5NNbh1gSlKC1wbnAkhqRVRzoyJkw8KeXKO+uXkSJQd1atFeTOa70X0BriHPtxvskmvfOKnVfP5xTIq7L+/awypYRxVy2n6voN9ZQ6qiAyhN55OZEfv1KLx8qfR7N/ZqyRBGh2CtRjadKivgMAibQqwrMld72w+yMYS8ByAIYYon94iJuT8WidFxyUtcluNzOR95m61fIWJkeZso6JiYyotdrFNk9oShMC0X/Mf7jc3VziYPhAeS2K8SM5CfGc6huVgsb42c58NRpHrEdGIeOw1Qoj3Wvz4Ilq+/AcS1QjOQvplYbJpwkYxXqKYGYy4QkTRKO26m2yjpX1HfKv7fcSqKVhgkYgrT3LZ9/Ju2GGI5rS+/4gieZQ8U= 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 03.12.24 20:51, Matthew Wilcox wrote: > I've pushed out a new tree to > git://git.infradead.org/users/willy/pagecache.git shrunk-page > aka > http://git.infradead.org/?p=users/willy/pagecache.git;a=shortlog;h=refs/heads/shrunk-page > > The observant will notice that it doesn't actually shrink struct page > yet. However, we're getting close. What it does do is rename > page->index to page->__folio_index to prevent new users of page->index > from showing up. BTW, I was wondering how often we convert a page to a folio to then access folio->index / folio->mapping and not actually having a folio (in the future). I suspect this will need quite some changes to get it right, and I would count that as "less obvious". Calling PageAnon() on anything mapped into user space page tables might be one such case, for example. > > There are (I believe) three build failures in that tree: > > - fb_defio > - fbtft > - s390's gmap (and vsie? is that the same thing?) Not completely (vsie (nested VMs) uses shadow gmap, ordinary VMs use ordinary gmap) , but they are very related (-> KVM implementation on s390x). I know that Claudio is working on some changes, but not sure how that would affect gmap's usage of page->index. s390x gmap is 64bit only, so we have to store stuff in 8byte. gmap page tables are Maybew e could simply switch from page->index to page->private? But I lost track if that will also be gone in the near future :) > > Other than that, allmodconfig builds on x86 and I'm convinced the build > bots will tell me about anything else I missed. > > Lorenzo is working on fb_defio and fbtft will come along for the ride > (it's a debug printk, so could just be deleted). > > s390 is complicated. I'd really appreciate some help. > > The next step is to feed most of the patches through the appropriate > subsystems. Some have already gone into various maintainer trees > (thanks!) > > > There are still many more steps to go after this; eliminating memcg_data > is closest to complete, and after that will come (in some order) > eliminating ->lru, ->mapping, ->refcount and ->mapcount. Will continue working on the latter ;) -- Cheers, David / dhildenb