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[2003:cb:c738:b400:6a82:1eac:2b5:8fca]) by smtp.gmail.com with ESMTPSA id ck8-20020a5d5e88000000b00341ba91c1f5sm8375997wrb.102.2024.03.25.07.05.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 25 Mar 2024 07:05:00 -0700 (PDT) Message-ID: <30e9e4da-334e-4e48-a716-5edc2f2c0c21@redhat.com> Date: Mon, 25 Mar 2024 15:05:00 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] huge_memory.c: document huge page splitting rules more thoroughly To: John Hubbard , Andrew Morton Cc: LKML , linux-mm@kvack.org, Matthew Wilcox , Zi Yan References: <20240325044452.217463-1-jhubbard@nvidia.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: <20240325044452.217463-1-jhubbard@nvidia.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: f4fykqdwmxskjwunb7ju7qkqfuygdh1n X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: F334DC002C X-Rspam-User: X-HE-Tag: 1711375505-646450 X-HE-Meta: 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 yR0C8lxG 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000019, 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 25.03.24 05:44, John Hubbard wrote: > 1. Add information about the behavior of huge page splitting, with > respect to page/folio refcounts, and gup/pup pins. > > 2. Update and clarify the existing documentation, to compensate for the > ravages of time and code change. > > Cc: David Hildenbrand > Cc: Matthew Wilcox > Cc: Zi Yan > > Signed-off-by: John Hubbard > --- Thanks! Reviewed-by: David Hildenbrand -- Cheers, David / dhildenb