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[149.14.88.26]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3878248f5a0sm1596847f8f.13.2024.12.11.08.15.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 11 Dec 2024 08:15:12 -0800 (PST) Message-ID: <598b5386-16f9-41e6-95e4-93f5ac32fb64@redhat.com> Date: Wed, 11 Dec 2024 17:15:10 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: The future of PageAnonExclusive To: Matthew Wilcox Cc: Ryan Roberts , "linux-mm@kvack.org" References: <9c2a17af-4df8-42f0-93c8-83133b6104fd@redhat.com> <3a9e7c3b-7b69-4f16-80ea-b1a0d4dba853@redhat.com> <41e5c2c6-01bb-40ab-a7bf-5b4e827377f8@arm.com> <9378073b-06bb-47b4-8435-32aba67d5845@redhat.com> <42869071-64a9-47d1-867d-9ddede6bf430@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: euc18g85PnmWoEozXe9eP1Aj7Pj_9x04JDeqjeA5SLU_1733933714 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: 8B48D140017 X-Stat-Signature: jd5waqptdomxp4fwx4u94jadd1t9ok1o X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1733933703-572610 X-HE-Meta: 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 EjfDY1B1 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.021729, 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 11.12.24 17:11, Matthew Wilcox wrote: > On Wed, Dec 11, 2024 at 04:50:12PM +0100, David Hildenbrand wrote: >> On 11.12.24 16:45, Matthew Wilcox wrote: >>> [1] https://kernelnewbies.org/MatthewWilcox/Memdescs >>> >>> Don't get too excited about "we're almost out of types". The "managed" >>> type has subtypes. We could also collapse "file" and "anon" into a >>> single type and distinguish between them with a bit in the folio. >>> >>> Anyway, yes, we can do one per-page flag. Two per-page flags starts to >>> get dicey. >> >> hwpoison? :/ > > type 9! My thinking is that the hwpoison type contains an orig_memdesc > field, as well as whatever else is needed to describe the hwpoison that > was discovered (start, length, what else?) Ah, I see. So you'd have to allocate that type during a MCE, and have all file/anon detection code respect that indirection as well. -- Cheers, David / dhildenb