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[2003:cb:c721:8100:177e:1983:5478:64ec]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3821ada3e65sm4532783f8f.13.2024.11.15.06.54.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 15 Nov 2024 06:54:15 -0800 (PST) Message-ID: Date: Fri, 15 Nov 2024 15:54:14 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 4/5] mm: shmem: add a kernel command line to change the default huge policy for tmpfs To: Daniel Gomez , Baolin Wang , akpm@linux-foundation.org, hughd@google.com Cc: willy@infradead.org, wangkefeng.wang@huawei.com, 21cnbao@gmail.com, ryan.roberts@arm.com, ioworker0@gmail.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <64091a3d5a8c5edb0461fae203cfcf6f302a19ce.1731397290.git.baolin.wang@linux.alibaba.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: ewra7_gxfRJdmVLhksfywOZs1q7uZnqAItpFQ2cUfrc_1731682457 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: rspam04 X-Rspamd-Queue-Id: D3C121C000C X-Stat-Signature: mcjeq9pji5nnioi8zrszmdhq1fhiz9ty X-Rspam-User: X-HE-Tag: 1731682405-817126 X-HE-Meta: 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 JO5E498x kctG3Cu3pNRfXXrXHag0qAebQ4PKWjpN5q4adGkZQcsgvM+ALS3k+M0I+w4UlQPkeQDGZBiOjAzq7EKmapvE/Lt/Vupm5il7T4WZtPSmHTHxzEyMte6dSXVZh+ZMpJfIBZ0iOzpNVdoWFoJprouJO5i4pHfsX5Y3D5AaCPZr2uFWOdTiscnhapCUuD0OnSHXuLpEbcgfIc4SeNSDpD/5DXi1nie3FKswcB6EdK6/4hZGlfcMmqQJYjZJbHd4OT+sUFa6XUbGknPlXgy1UapjtnjfURrLi2aOPLrpPKSV0pd+ol10yCVLV39a4eIjPb6DsQyAlM/HNN2nbKqgB3GKapdXKkR0pks7qS65ltfUbBRoi23qpNA+puObqNsFzCbhSt9iE5W4Bm5cAAbWlsm70UDfFJ+WA4ogosqumn7jUejfP+wE= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000322, 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 15.11.24 15:02, Daniel Gomez wrote: > On Tue Nov 12, 2024 at 8:45 AM CET, Baolin Wang wrote: >> Now the tmpfs can allow to allocate any sized large folios, and the default >> huge policy is still 'never'. Thus adding a new command line to change >> the default huge policy will be helpful to use the large folios for tmpfs, >> which is similar to the 'transparent_hugepage_shmem' cmdline for shmem. > > > I think it would be good to include a summary of why tmpfs is not > enabling large folios by default as the other fs. David has been > pretty good at repeating the reasons over and over and it would be very > valuable to have them included here. Yes. We also discussed in v4 the idea of having a Kconfig option to just change the default policy to "always". We could mention that here as well. -- Cheers, David / dhildenb