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(p200300cbc7082700bdf6739b9f9d862f.dip0.t-ipconnect.de. [2003:cb:c708:2700:bdf6:739b:9f9d:862f]) by smtp.gmail.com with ESMTPSA id b7-20020adfee87000000b0033aebf727b2sm5441018wro.60.2024.01.30.01.08.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 30 Jan 2024 01:08:55 -0800 (PST) Message-ID: Date: Tue, 30 Jan 2024 10:08:53 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 9/9] mm/memory: optimize unmap/zap with PTE-mapped THP To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, Andrew Morton , Matthew Wilcox , Ryan Roberts , Catalin Marinas , Will Deacon , "Aneesh Kumar K.V" , Nick Piggin , Peter Zijlstra , Michael Ellerman , Christophe Leroy , "Naveen N. Rao" , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Arnd Bergmann , linux-arch@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org References: <20240129143221.263763-1-david@redhat.com> <20240129143221.263763-10-david@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: <20240129143221.263763-10-david@redhat.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-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: F1388C0014 X-Stat-Signature: a3qhwsn11q7pwcap5wnipkjk9wt6yjth X-HE-Tag: 1706605739-729681 X-HE-Meta: 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 hJY4jp0s 0fBL2bfPXtmBC1JWnzzicoMop3pinza34+1PiK3mhsJVXqzLvh+1Cx8AM4E5FCK2BxXkAjH5WDm1GjLV9/OKnLCFa2l4W6VB+ZkyN7t5Na4z/YRmnmGW/5n6IphqN4Fc8KoRZbPF1zWbOsHYtjv4bwhm9ftDH7C96a4LekoxAS6K7zCRSvV42VCTbDtlATykuTAALMVm6whTSe5Kew+nZx1oyBjG1AwPYlIQo57s8LQg65YNCFLfGqgfDOw5QxxZRLcL1ogSbKosNbH8APj9R5JJEpY6Y68tlRkW08aTD/tYQyqiAkEUCIcA4wtknHVKLXc4pGnR+UO7oWIO9QJTjou6Gzl6ThvpbdtFdrfpc5vAbCCAoF27yO+4M/XSreS593bWMSiz+LCBiCIkI1/cg141NxuIfNn5q97JotWx9qYPZ3Vg= 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: Re-reading the docs myself: > +#ifndef get_and_clear_full_ptes > +/** > + * get_and_clear_full_ptes - Clear PTEs that map consecutive pages of the same > + * folio, collecting dirty/accessed bits. > + * @mm: Address space the pages are mapped into. > + * @addr: Address the first page is mapped at. > + * @ptep: Page table pointer for the first entry. > + * @nr: Number of entries to clear. > + * @full: Whether we are clearing a full mm. > + * > + * May be overridden by the architecture; otherwise, implemented as a simple > + * loop over ptep_get_and_clear_full(), merging dirty/accessed bits into > + * returned PTE. "into the" > + * > + * Note that PTE bits in the PTE range besides the PFN can differ. For example, > + * some PTEs might be write-protected. > + * > + * Context: The caller holds the page table lock. The PTEs map consecutive > + * pages that belong to the same folio. The PTEs are all in the same PMD. > + */ > +static inline pte_t get_and_clear_full_ptes(struct mm_struct *mm, > + unsigned long addr, pte_t *ptep, unsigned int nr, int full) > +{ > + pte_t pte, tmp_pte; > + > + pte = ptep_get_and_clear_full(mm, addr, ptep, full); > + while (--nr) { > + ptep++; > + addr += PAGE_SIZE; > + tmp_pte = ptep_get_and_clear_full(mm, addr, ptep, full); > + if (pte_dirty(tmp_pte)) > + pte = pte_mkdirty(pte); > + if (pte_young(tmp_pte)) > + pte = pte_mkyoung(pte); > + } > + return pte; > +} > +#endif > + > +#ifndef clear_full_ptes > +/** > + * clear_full_ptes - Clear PTEs that map consecutive pages of the same folio. > + * @mm: Address space the pages are mapped into. > + * @addr: Address the first page is mapped at. > + * @ptep: Page table pointer for the first entry. > + * @nr: Number of entries to clear. > + * @full: Whether we are clearing a full mm. Something went missing: May be overridden by the architecture; otherwise, implemented as a simple loop over ptep_get_and_clear_full(). -- Cheers, David / dhildenb