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[149.14.88.26]) by smtp.gmail.com with ESMTPSA id ce6-20020a5d5e06000000b0033af3a43e91sm7109194wrb.46.2024.01.31.07.11.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 31 Jan 2024 07:11:22 -0800 (PST) Message-ID: <13e2fac7-5f65-4257-a478-4359cec31939@redhat.com> Date: Wed, 31 Jan 2024 16:11:21 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 00/15] mm/memory: optimize fork() with PTE-mapped THP To: Ryan Roberts , linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, Andrew Morton , Matthew Wilcox , Russell King , Catalin Marinas , Will Deacon , Dinh Nguyen , Michael Ellerman , Nicholas Piggin , Christophe Leroy , "Aneesh Kumar K.V" , "Naveen N. Rao" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , "David S. Miller" , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org References: <20240129124649.189745-1-david@redhat.com> <57eb82c7-4816-42a2-b5ab-cc221e289b21@arm.com> <714d0930-2202-48b6-9728-d248f820325e@arm.com> <30718fc8-15cf-41e4-922c-5cdbf00a0840@redhat.com> <74333154-a99b-4bad-81f4-bee02ba05e91@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-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 928ABC0034 X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: xxhtz9h13txi3b65ogcd8qt8i1zy65az X-HE-Tag: 1706713886-182074 X-HE-Meta: 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 uydA3t3G kykW0imFbYZYas6VyTbvQ7EufjpxAVhEogP+grNnxl99bOlNZfePLH60OjP1CnA5kd11F87smL/fUJynArNdgBn0Oz+A0uxEHHuIq78zcl/6OVGCewmcMvgtM2VhzQ7FkIm/fI8r2iCyFCrcpmn6xcxKRCSMdwIhFIU9AKZPB0s9PzE8c+cafJGesr9JKks8zAgb6pL4fJo01rX3WLaSVK0dF8hOz9gE97S7tv+/8ens7z1T+fHA5VG56YAoEqzP5RoT/orsndy6zJZvR4+2GhaOLlYv0B8aNeJ1zdRACSZc6vWxKQg/Nf1MOw7VGlUG6roYWmbGa9wWL02emOa0O27GL/reuziOzwTdH3A+WfpkXEAG3niY+7ar4rVbVjsORd8NqJ0a+r9+hwmrL1OLDouHwMvmNS6TiYb8OxKL9MgBGke0erG51I7TADKQpuCVG77GA8vBxrRWYfYmHLIaaB0sUaxzHOngaBdVNJwO/Hi9pxT1Hr1pX4iu8FA== 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: >> dontneed should hopefully/likely see a speedup. > > Yes, but that's almost exactly the same path as munmap, so I'm sure it really > adds much for this particular series. Right, that's why I'm not including these measurements. dontneed vs. munmap is more about measuring the overhead of VMA modifications + page table reclaim. > Anyway, on Altra at least, I'm seeing no > regressions, so: > > Tested-by: Ryan Roberts > Thanks! -- Cheers, David / dhildenb