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(p200300cbc70bdb00724d8b0c110e3713.dip0.t-ipconnect.de. [2003:cb:c70b:db00:724d:8b0c:110e:3713]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-38bf327df79sm16736935f8f.91.2025.01.22.05.58.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 22 Jan 2025 05:58:05 -0800 (PST) Message-ID: <5be3ed89-f19e-4f54-9e4e-fc8f39046b84@redhat.com> Date: Wed, 22 Jan 2025 14:58:03 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: mm: CMA reservations require 32MiB alignment in 16KiB page size kernels instead of 8MiB in 4KiB page size kernel. To: Zi Yan , Juan Yescas Cc: Barry Song <21cnbao@gmail.com>, linux-mm@kvack.org, muchun.song@linux.dev, rppt@kernel.org, osalvador@suse.de, akpm@linux-foundation.org, lorenzo.stoakes@oracle.com, Jann Horn , Liam.Howlett@oracle.com, minchan@kernel.org, jaewon31.kim@samsung.com, charante@codeaurora.org, Suren Baghdasaryan , Kalesh Singh , "T.J. Mercier" , Isaac Manjarres , iamjoonsoo.kim@lge.com, quic_charante@quicinc.com References: <463eb421-ac16-435c-b0a0-51a6a92168f6@redhat.com> <8f36d3ca-3a31-4fc4-9eaa-c53ee84bf6e7@redhat.com> <6d13a5e9-bdff-435b-ad7a-3a3a550738b0@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: GTW-7ONfdKMIGEQLyetJDbmwKSDsxFB8_qo1kS2u1r8_1737554287 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: CFCAE40006 X-Stat-Signature: fmw115xaog6tjm1qzsdwn75dgzqyfoy5 X-Rspam-User: X-HE-Tag: 1737554289-847245 X-HE-Meta: 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 ZHwOY84s Ew5YQVQy2Yg4nO3Rv6/V9X9Kh9Inq71iKGKFFCo8C2gT4JlmC+JeKOCtBx0ZXL0+DaDQq4rXlLuMjcUieNuIByyZxdNemSIH9BfCl8cZHV/wL2PhYGEf5Mo3kdzP6513Vb6ZywOP6CyXtOKgdpJAV5FGXjDpuoYuo/G1TDH20DdOACr5STe2XDbmptEQ8rnES0kLl0T2UeYQwLRhkb/fMMTL+wFbQBOoWeuxVDO5IXWREkTHJC/BhVPBjprIEkTVdmoXNjV0kOTprdkQNrfG6gzt8sFC1yv9HSXYUWM/s5iwShO2MfAupa8fOQag0gRKY+IVo3mDQJnxe1gWP9XGe5mZVSzVF48uMq0kHaJAJ758ZheolbK/HeRR4T3Kj6dQpGKBYVxmQlmZpoOo= 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: >> In the future, I could imagine just going for a smaller pageblock size >> on aarch64, and handling fragmentation avoidance for larger THPs (512 >> MiB really is close to 1 GiB on x86) differently, not using pageblocks. > > Right. That is what I meant by "...compaction, to work on a different > range, independent of pageblock". But based on Juan's reply[1], 32MB PMD > THP is still needed for the deployment. That means "the future" needs to > be done to fully satisfy Juan's needs. :) Yes, larger systems will also want 512 MiB THP. -- Cheers, David / dhildenb