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[91.12.102.98]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-38c2a176434sm15049291f8f.13.2025.01.28.10.33.03 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 28 Jan 2025 10:33:05 -0800 (PST) Message-ID: Date: Tue, 28 Jan 2025 19:33:03 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [LSF/MM/BPF TOPIC] CMA reservation optimizations To: Juan Yescas Cc: lsf-pc@lists.linux-foundation.org, Suren Baghdasaryan , linux-mm@kvack.org, Kalesh Singh , Isaac Manjarres , "T.J. Mercier" , Zi Yan , Barry Song <21cnbao@gmail.com> References: <50b7265e-64b9-41a3-af48-79ded6674f21@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: P_hx0SPmEVLK5ksG1LZOLNynnQB6-B2WsPKha9Cre3M_1738089187 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 4B950140016 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: 7yoeu6bjxhtqsxcokn8qjwfw75xm7zwr X-HE-Tag: 1738089190-527194 X-HE-Meta: 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 OWm2VKC9 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 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 28.01.25 18:07, Juan Yescas wrote: > On Tue, Jan 28, 2025 at 1:58 AM David Hildenbrand wrote: >> >> On 28.01.25 02:04, Juan Yescas wrote: >>> Hi LSF organizers, >>> >>> I would like to continue discussing this topic with the mm community: >>> >>> "CMA reservation optimizations" >>> >>> Note: There is already an email in the linux-mm mailing list that is >>> discussing this issue. The title is: >>> >>> "CMA reservations require 32MiB alignment in 16KiB page size kernels >>> instead of 8MiB in 4KiB page size kernel" >>> >>> Background >>> >>> When the drivers reserve CMA memory in 16KiB kernels, the minimum >>> alignment is 32 MiB as per CMA_MIN_ALIGNMENT_BYTES. However, in 4KiB >>> kernels, the CMA alignment is 4MiB. >> >> I'm curious, here you say 4 MiB, above 8 MiB. >> > > My bad, it is a typo. I meant 4 MiB. That makes sense. > >> But nowadays it's usually 2 MiB (pageblock size), no? > > That's right for the case when THPs are enabled in 4KiB page size configs. > > #define pageblock_order MIN_T(unsigned int, HPAGE_PMD_ORDER, MAX_PAGE_ORDER) > https://elixir.bootlin.com/linux/v6.13/source/include/linux/pageblock-flags.h#L50 > > This evals to pageblock_order = min(21 - 12, 10) = 9 > > #define CMA_MIN_ALIGNMENT_PAGES pageblock_nr_pages > #define CMA_MIN_ALIGNMENT_BYTES (PAGE_SIZE * CMA_MIN_ALIGNMENT_PAGES) > https://elixir.bootlin.com/linux/v6.13/source/include/linux/cma.h#L21 > > CMA_MIN_ALIGNMENT_BYTES = (4096 * 2 ^ 9) = (4096 * 512) = 2097152 = 2 MiB > > However, when THPs are disabled, we get: > > #define pageblock_order MAX_PAGE_ORDER // 10 > https://elixir.bootlin.com/linux/v6.13/source/arch/arm64/Kconfig#L1630 > https://elixir.bootlin.com/linux/v6.13/source/include/linux/pageblock-flags.h#L55 > > CMA_MIN_ALIGNMENT_BYTES = (4096 * 2 ^ 10) = (4096 * 1024) = 4194304 = 4 MiB Right, and it can depend on ARCH_FORCE_MAX_ORDER. I've been wondering for a while if pageblock_order should nowadays default to HPAGE_PMD_ORDER, with the option to make it smaller/larger (likely smaller) -- as discussed. As discussed, the topic you are touching on is also relevant for virtio-mem, which can add/remove memory currently in pageblock granularity: 512 MiB on arm64 are not particularly helpful. I think we could support adding/removing smaller granularity, but it requires a bit of work, and always isolating 512MiB worth of pages just to effectively allocate e.g., 2 MiB worth of pages is rather suboptimal. Same applies to CMA I assume. So there is more infrastructure that could benefit from pageblocks to rather be on the smaller side, even when hugetlb+THP might not be around in a config. -- Cheers, David / dhildenb