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[2003:cb:c715:8600:f05d:97b6:fb98:2bc1]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-36796b3efb4sm3026251f8f.96.2024.07.04.03.30.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 04 Jul 2024 03:30:05 -0700 (PDT) Message-ID: Date: Thu, 4 Jul 2024 12:30:04 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 11/45] fs/proc: Enable smaps_pte_entry to handle cont-pte mapped hugetlb vmas To: Oscar Salvador , Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Peter Xu , Muchun Song , SeongJae Park , Miaohe Lin , Michal Hocko , Matthew Wilcox , Christophe Leroy References: <20240704043132.28501-1-osalvador@suse.de> <20240704043132.28501-12-osalvador@suse.de> 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: <20240704043132.28501-12-osalvador@suse.de> 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: F288680015 X-Stat-Signature: dpf9z5snoumo13ke48zqwenyorzgbrim X-Rspamd-Server: rspam09 X-Rspam-User: X-HE-Tag: 1720089009-385424 X-HE-Meta: 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 HqNGtgHy NuSWHQyStfjNwgAPT4Sxs2hWb195Xy2YDFgGaro+5Evs7wKQDk5uJKLTB0QbH5UtH8ir/fzTJ9ruZ9amVwY8U74bF1gxG4n1owQh9sGrxMQwVhB+VY4uH2kEIZdlIQLbx3raj6QOKoexXS61KAZMJOfndzteiAj9LqeDxCRe2jiD+26Ebv53/CK7aLYu7nX9nQ4GxPcqRHqYQX5IcncNs8k5MvJADPoYxduqk8DxCTlSm0mBsdcA7ADx7OfsZobrfQhMGNBTj/eMGrySqGixuZ9hwahHBlTWnTbW96SiK9flu1KPBIgkfCOXIj/hXSzCm/m2XhXaQSEFsQoNqwjXRYhIpQt5X897aIE/Ygrnys922kStSwWV76Q6ptD27ClSNZzMaL9E77UoKPgQVbz5xI5SzItYJpS5uBhpBk8R92At/EE4= 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: > > #ifdef CONFIG_PGTABLE_HAS_HUGE_LEAVES > @@ -952,6 +956,7 @@ static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, > struct vm_area_struct *vma = walk->vma; > pte_t *pte; > spinlock_t *ptl; > + unsigned long size, cont_ptes; > > ptl = pmd_huge_lock(pmd, vma); > if (ptl) { > @@ -965,7 +970,9 @@ static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, > walk->action = ACTION_AGAIN; > return 0; > } > - for (; addr != end; pte++, addr += PAGE_SIZE) > + size = pte_cont(ptep_get(pte)) ? PAGE_SIZE * CONT_PTES : PAGE_SIZE; > + cont_ptes = pte_cont(ptep_get(pte)) ? CONT_PTES : 1; > + for (; addr != end; pte += cont_ptes, addr += size) The better way to do this is to actually batch PTEs also when cont-pte is not around (e.g., x86). folio_pte_batch() does that and optimized automatically for the cont-pte bit -- which should only apply if we have a present folio. So this code might need some slight reshuffling (lookup the folio first, if it's large use folio_pte_batch(), otherwise (small/no normal folio) process individual PTEs). -- Cheers, David / dhildenb