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[2003:cb:c70d:3a00:d73c:6a8:ca9f:1df7]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-436e2e92794sm32784645e9.37.2025.01.08.13.24.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 08 Jan 2025 13:24:18 -0800 (PST) Message-ID: <127a4c29-e34d-401c-a642-cc73d9d1c2f6@redhat.com> Date: Wed, 8 Jan 2025 22:24:16 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Swap Min Odrer To: Chris Li Cc: Daniel Gomez , Ryan Roberts , Barry Song , Andrew Morton , linux-mm@kvack.org, Luis Chamberlain , Pankaj Raghav , David Rientjes References: <20250107094347.l37isnk3w2nmpx2i@AALNPWDAGOMEZ1.aal.scsc.local> <20250107122931.qpkn43yvs4kq3twi@AALNPWDAGOMEZ1.aal.scsc.local> <470be5fa-97d6-4045-a855-5332d3a46443@redhat.com> <20250108141406.3gen6dnlb3b4zga6@AALNPWDAGOMEZ1.aal.scsc.local> <85e2b81d-9255-4c54-b4ae-de52b2c02e7f@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: MB5Drpt381r1qgDchjvFiMtlezGoVRJoqOvAtrcAlOE_1736371460 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: B766E40013 X-Stat-Signature: efzqd59m1kbtf3e87fx3c7ccuffwytz1 X-Rspam-User: X-HE-Tag: 1736371464-670038 X-HE-Meta: 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 qvPMHMEM gpHUDnRFNpZAlv6nPRSVstK48/PZP1xcRf6qAFJz6zEy4Y29LUwwL/UitD2seFT5bUEzpUgRoayyRgqWebACLeeUBFkUz2yeqsYA9lKMbsNk9gOLgHRMrrF6rYMhrDuhQa8IEqfFcC1/zBhbkJOr9ekDfU0Aqw24TKCEm1UXZEKLRXHPzYNp2Qtn/cVcNyxoP37I5MyUHZ9ce3BSd2mBxbYOZ7JCgRhw0jjMQ7rfCsVnmb232HEYcWveJl0KLhcU489LCQDsryAespy/m+zqHQYe5j3nUtDROVg0yy84iPDxYYL0gzfgHhPXTxBFqo3Uj7pLEoi7vnwludXx6NXJb5zMrug/LbTHc+kGyiBdjK0O7+LwulEnlkY0CrvfuON+OTK0BezAgAJqxr8VF8xXF22JzL5H218fxxQdBc6rLglY4jDOkEhGIejodb6DZdPUcFXrL X-Bogosity: Ham, tests=bogofilter, spamicity=0.000003, 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 08.01.25 22:19, Chris Li wrote: > On Wed, Jan 8, 2025 at 12:36 PM David Hildenbrand wrote: >> >>>> Maybe the swapcache could somehow abstract that? We currently have the swap >>>> slot allocator, that assigns slots to pages. >>>> >>>> Assuming we have a 16 KiB BS but a 4 KiB page, we might have various options >>>> to explore. >>>> >>>> For example, we could size swap slots 16 KiB, and assign even 4 KiB pages a >>>> single slot. This would waste swap space with small folios, that would go >>>> away with large folios. >>> >>> So batching order-0 folios in bigger slots that match the FS BS (e.g. 16 >>> KiB) to perform disk writes, right? >> >> Batching might be one idea, but the first idea I raised here would be >> that the swap slot size will match the BS (e.g., 16 KiB) and contain at >> most one folio. >> >> So a order-0 folio would get a single slot assigned and effectively >> "waste" 12 KiB of disk space. > > I prefer not to "waste" that. It will be wasted on the write > amplification as well. If it can be implemented fairly easily, sure! :) Looking forward to hearing about the proposal! -- Cheers, David / dhildenb