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[2003:cb:c741:ac00:f27c:e128:f876:f17e]) by smtp.gmail.com with ESMTPSA id k17-20020a5d4291000000b0032da87e32e2sm10249162wrq.4.2023.10.24.08.51.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 24 Oct 2023 08:51:48 -0700 (PDT) Message-ID: Date: Tue, 24 Oct 2023 17:51:47 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/rmap: vm_flags including VM_EXEC can exit timely To: Zhiguo Jiang , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: opensource.kernel@vivo.com References: <20231024144913.421-1-justinjiang@vivo.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: <20231024144913.421-1-justinjiang@vivo.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-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 775C4180026 X-Stat-Signature: ywdpmtfjzrqhhpjmuke1tqio3xb7kxod X-Rspam-User: X-HE-Tag: 1698162720-61668 X-HE-Meta: U2FsdGVkX18U/XUhj2Fyt3e/p+Z3as1tRBOpi1VACW26bsmn7YJ/0dTe3tCcTYbWX1yJFr4OdxvT+YcV0K18SiCF9N2owup8FpkxuzvcLJ7z9ep/D3hPhBnWm2V6S8CIXNtF7pk7vXhg2X41BZkuUwyHthU6rawFKQQr36RN+Su1nHxYpv9DxiX4dREPU25obIMfLPOU9rLYyOunZriiOeB20xzumsZyiNyYzV2p7+ZYS9d403O7kZPvUFJk8yEEBIDJyB8uFeC4B+IyRUWXNTlC1C3GURaAxSxWn+moGSwzsVfovPw1OVgagztx1sg2lu2CWMGQnpoVQuMV9kOZgQH5RY8qjG+fQOiVr2hav6GREK+axUhLzgNqFAKSLEmeXP6eqFc1RqwxNIFdweq+nq4k6ZESNAKWoaAkjwcKaKcByaV3KPqtjIjiXKVXo17NvjVywFb7eKoaSpgrXhMgJFhgdvdd5+qwffBZ8EDsvEY8naNhsRsPcEhdYYQsSK4fYM/D3xZNOKG7/nlnVMyoUvV9XZcFf79JHIJ6j2HUukNlK+RNdp7yDjcPsoVI98H6pA4iac2mPJhkLLV5Iu1wQ8EAbq53Fd89HrSM0dlMRs+tuxyRxG/lJOZuvcRcVVQuUMcdFcQaOd5yhfAHvQ4wdfC0oes11TsiPuhWxvIX+zB8Nl2tGG8AkUeNukEQInkPGtN7ayaAZgdyTLY8wsf7Wu+Ab75ZXdbbi89RH8zrhEA3xG8Bo7FZjJM+KRFznCCM2b9QEvle9PLlTRFkVB0iDBSnclvpT+WYBkylBJHBAMxz3ePYlPBn6wJ+/YCrzZYYE36Tvn4fKlvMq1fBosQsqsc+9Pe2Ju2OBMNJlP2kAcD7TN4lPgSP97nFkJbfGWaabcAM0OPvZmWCi1z9XVihv6tKZz+YcO1rMoJ0/Ihe2/+IV+9peAF32hndDQdUIsc2bKjiIqFDP6T93xcTZHf 6GIcUozX 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000406, 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 24.10.23 16:49, Zhiguo Jiang wrote: > When pra->vm_flags include VM_EXEC flag and folio is file detected in > folio_referenced_one(), the folio referenced traversal process can be > exited timely to reduce the detecting folio referenced time. > Can you further elaborate what the logic behind that is? Why can we stop here if we're dealing with a pagecache folio in an executable VMA? > Signed-off-by: Zhiguo Jiang > --- > mm/rmap.c | 2 ++ > 1 file changed, 2 insertions(+) > mode change 100644 => 100755 mm/rmap.c > > diff --git a/mm/rmap.c b/mm/rmap.c > index 7a27a2b41802..932f3b7e8521 > --- a/mm/rmap.c > +++ b/mm/rmap.c > @@ -884,6 +884,8 @@ static bool folio_referenced_one(struct folio *folio, > if (referenced) { > pra->referenced++; > pra->vm_flags |= vma->vm_flags & ~VM_LOCKED; > + if ((pra->vm_flags | VM_EXEC) && folio_is_file_lru(folio)) > + return false; > } > > if (!pra->mapcount) -- Cheers, David / dhildenb