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[2003:d8:2f3a:cb00:3f4e:6894:3a3b:36b5]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-381eda04049sm5151978f8f.93.2024.11.08.07.30.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 08 Nov 2024 07:30:37 -0800 (PST) Message-ID: <3d49fbf8-866f-485b-b7fa-a89bbfb3cd7c@redhat.com> Date: Fri, 8 Nov 2024 16:30:36 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/4] Support large folios for tmpfs To: 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, da.gomez@samsung.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: 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: 3ddvN20Igat9ylQbHHiaKhDvo9Y1j8H3RlKTJPpCWI0_1731079839 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 8A2F0A0027 X-Stat-Signature: yujpgy5m6t4wzqz18fgxfxtwjpmhazmt X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1731079806-923365 X-HE-Meta: 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 IYkNsNyp 6bk4qUC/Zf0l27XVoJoXDNFw+rSZFRLcvW7CHVWpEZ9xDjXlYHhhWjOPkxQOChO0wSfhPLMFEXGS8a/fne/vwIsLnlOtyOYzOIXRPvURRpAnmUBelKtjHsOaL4U87QshbUPsfvQzhNvRbXw2o/UdeCNqPDyD8Q+LBFQVQls+kmp8FvwCuEXmEqr6no4YbMqzffadJySmXFSYgkujG7hWWr6kt+h4gK7NDSC2MgKI34f47dv85M8CagGm2ANX86JvjZYTn97njv4swH8dDknSLUrJvrCoRmNhGopf2HmL2hLjxFVyIJGgCGwp+hoQUd51K8fERX+Hm5KVFTHiAWy1AZAKXzgyXk4hGe4P9g+0XdFvImtsxNRkBP7pptwrzGoxUg6vVFipN76eFGCQ= 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 08.11.24 05:12, Baolin Wang wrote: > Traditionally, tmpfs only supported PMD-sized huge folios. However nowadays > with other file systems supporting any sized large folios, and extending > anonymous to support mTHP, we should not restrict tmpfs to allocating only > PMD-sized huge folios, making it more special. Instead, we should allow > tmpfs can allocate any sized large folios. > > Considering that tmpfs already has the 'huge=' option to control the huge > folios allocation, we can extend the 'huge=' option to allow any sized huge > folios. The semantics of the 'huge=' mount option are: > > huge=never: no any sized huge folios > huge=always: any sized huge folios > huge=within_size: like 'always' but respect the i_size > huge=advise: like 'always' if requested with fadvise()/madvise() > > Note: for tmpfs mmap() faults, due to the lack of a write size hint, still > allocate the PMD-sized huge folios if huge=always/within_size/advise is set. So, no fallback to smaller sizes for now in case we fail to allocate a PMD one? Of course, this can be added later fairly easily. > > Moreover, the 'deny' and 'force' testing options controlled by > '/sys/kernel/mm/transparent_hugepage/shmem_enabled', still retain the same > semantics. The 'deny' can disable any sized large folios for tmpfs, while > the 'force' can enable PMD sized large folios for tmpfs. > > Any comments and suggestions are appreciated. Thanks. > > Hi David, > I did not add a new Kconfig option to control the default behavior of 'huge=' > in the current version. I have not changed the default behavior at this > time, and let's see if there is a need for this. Likely we want to change the default at some point so people might get a benefit in more scenarios automatically. But I did not investigate how /tmp is mapped as default by Fedora, for example. -- Cheers, David / dhildenb