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(p200300cbc72f03001ec7296288890ef6.dip0.t-ipconnect.de. [2003:cb:c72f:300:1ec7:2962:8889:ef6]) by smtp.gmail.com with ESMTPSA id q18-20020a05600000d200b003334041c3edsm8233518wrx.41.2023.12.05.09.21.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 05 Dec 2023 09:21:56 -0800 (PST) Message-ID: <8d5fdb17-c670-4814-8f48-4b90062668fc@redhat.com> Date: Tue, 5 Dec 2023 18:21:55 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 00/10] Multi-size THP for anonymous memory To: Ryan Roberts , Andrew Morton , Matthew Wilcox , Yin Fengwei , Yu Zhao , Catalin Marinas , Anshuman Khandual , Yang Shi , "Huang, Ying" , Zi Yan , Luis Chamberlain , Itaru Kitayama , "Kirill A. Shutemov" , John Hubbard , David Rientjes , Vlastimil Babka , Hugh Dickins , Kefeng Wang , Barry Song <21cnbao@gmail.com>, Alistair Popple Cc: linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20231204102027.57185-1-ryan.roberts@arm.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: <20231204102027.57185-1-ryan.roberts@arm.com> X-Mimecast-Spam-Score: 0 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: y53trgjtw9c15w4ggqsjcjccpt5riiw1 X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 73D0040003 X-Rspam-User: X-HE-Tag: 1701796921-606533 X-HE-Meta: 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 xyggEAAw SxkUsx80xdmB+Zj2T5BHuHheeWKs2El1u981yekj3Zhq4F3BWH5F8le+UKANHTJyWXfaCFSBOkRNbNmRfIeWzy/bHpAIy1LY/hMP6tr5oIAxpcHlKNHJe1lxhq/q3n+iWvqKLwN0zoxVUfzSefZg+fug2FPLkBlyyuFSbcRPmzcKlM8di7PX3TRfyAzm9pMVLpbvSTIlDV44ijANlh/II7Hw8tUSsKyQcYqETlgI1Kd7lZLReerskdr9F/RiSy0sjccHL08zuiK+Z+EkGfyWquIoKp9NNU2Ljyp5xiKAfrOQge+BDaC+ab9cr/gFSXOMe1HesGoQBdujBvMjNtnK9hg8LkY0k77A0mlkGKMyVgRlSIq5Srp/eDcBATl7eq1wW/I3JO432hZ4XevkrTSwjJPhRBnlG02LNNPDuCEqZ+w+8TcJtEluWBCOQRNDlJYpbZNe/QZZg6R6g2j6Q4PwXtQJcTbmX3A9OoTEWzeCS8lkDEjw= 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 04.12.23 11:20, Ryan Roberts wrote: > Hi All, > > A new week, a new version, a new name... This is v8 of a series to implement > multi-size THP (mTHP) for anonymous memory (previously called "small-sized THP" > and "large anonymous folios"). Matthew objected to "small huge" so hopefully > this fares better. > > The objective of this is to improve performance by allocating larger chunks of > memory during anonymous page faults: > > 1) Since SW (the kernel) is dealing with larger chunks of memory than base > pages, there are efficiency savings to be had; fewer page faults, batched PTE > and RMAP manipulation, reduced lru list, etc. In short, we reduce kernel > overhead. This should benefit all architectures. > 2) Since we are now mapping physically contiguous chunks of memory, we can take > advantage of HW TLB compression techniques. A reduction in TLB pressure > speeds up kernel and user space. arm64 systems have 2 mechanisms to coalesce > TLB entries; "the contiguous bit" (architectural) and HPA (uarch). > > This version changes the name and tidies up some of the kernel code and test > code, based on feedback against v7 (see change log for details). > > By default, the existing behaviour (and performance) is maintained. The user > must explicitly enable multi-size THP to see the performance benefit. This is > done via a new sysfs interface (as recommended by David Hildenbrand - thanks to > David for the suggestion)! This interface is inspired by the existing > per-hugepage-size sysfs interface used by hugetlb, provides full backwards > compatibility with the existing PMD-size THP interface, and provides a base for > future extensibility. See [8] for detailed discussion of the interface. > > This series is based on mm-unstable (715b67adf4c8). I took a look at the core pieces. Some things might want some smaller tweaks, but nothing that should stop this from having fun in mm-unstable, and replacing the smaller things as we move forward. -- Cheers, David / dhildenb