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[2003:cb:c719:1700:56dc:6a88:b509:d3f3]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-436604e9c2csm593732875e9.43.2025.01.07.02.31.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 07 Jan 2025 02:31:06 -0800 (PST) Message-ID: Date: Tue, 7 Jan 2025 11:31:05 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Swap Min Odrer To: Daniel Gomez , Ryan Roberts , Barry Song , Andrew Morton Cc: linux-mm@kvack.org, Luis Chamberlain , Pankaj Raghav References: <20250107094347.l37isnk3w2nmpx2i@AALNPWDAGOMEZ1.aal.scsc.local> 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: <20250107094347.l37isnk3w2nmpx2i@AALNPWDAGOMEZ1.aal.scsc.local> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: DNH1qXZxK745zfM3Otw0GCDeYGjDLgcEl7I35rwzLwc_1736245867 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: dgwx9egxwhofmrg6ezp6yhjyw4pps4u9 X-Rspamd-Queue-Id: 94A2514000A X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1736245871-600574 X-HE-Meta: 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 ZfyOuTCk MD/0CKw0WTclyOLRzoPmJv10sViYBgwD/GmPUjcM+40ynRskUENm/VGaOlKhOKvewxVdg71QSB9Fe0sr7UqktXULhxauWOxlwcsUdGx1BOnuVEatTrPMGL0uJ1x+4bpUaoQhEGn1R4XAR1fMQR5rbogHI6fClqiFl2y2C3nsMTIxH0B7FvR2+aYgCgfktxLv55rohZmKVZCLfe38SKsbwpXWnbhrvHcxuHGQKa6aAGvlPRcjbx3a8QfOufs/l6E85UL5mm+3SxVmNDWFCnr442oQqhJDL7WW402V1Qq48RoMN0/Vm7f3JaitHVk/JohD6P+YABiBUQCT4UpCpDB2TBf0ipDy2+uhkYXcq043ItB5npr3dUT4c68N+aRPRaIuh9Wpzy7UFJKhWPqDetaqF2T/EbZKfdh3xWNos 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 07.01.25 10:43, Daniel Gomez wrote: > Hi, Hi, > > High-capacity SSDs require writes to be aligned with the drive's > indirection unit (IU), which is typically >4 KiB, to avoid RMW. To > support swap on these devices, we need to ensure that writes do not > cross IU boundaries. So, I think this may require increasing the minimum > allocation size for swap users. How would we handle swapout/swapin when we have smaller pages (just imagine someone does a mmap(4KiB))? Could this be something that gets abstracted/handled by the swap implementation? (i.e., multiple small folios get added to the swapcache but get written out / read in as a single unit?). I recall that we have been talking about a better swap abstraction for years :) Might be a good topic for LSF/MM (might or might not be a better place than the MM alignment session). -- Cheers, David / dhildenb