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([2a09:80c0:192:0:5dac:bf3d:c41:c3e7]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-426ce5e81d2sm23701197f8f.49.2025.10.14.05.13.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 14 Oct 2025 05:13:27 -0700 (PDT) Message-ID: <2d83dda6-b552-4cfe-a092-a2df534c7cc1@redhat.com> Date: Tue, 14 Oct 2025 14:13:26 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/3] mm: mprotect: avoid unnecessary struct page accessing if pte_protnone() To: Kefeng Wang , Andrew Morton , Lorenzo Stoakes , linux-mm@kvack.org Cc: Zi Yan , Baolin Wang , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Liam.Howlett@oracle.com, Sidhartha Kumar References: <20251014113349.2618158-1-wangkefeng.wang@huawei.com> <20251014113349.2618158-3-wangkefeng.wang@huawei.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 ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20251014113349.2618158-3-wangkefeng.wang@huawei.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: IeEq-ZeaBELfXluNnv5PqWrc4NnfnfmxngBGV6arh4M_1760444008 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-Queue-Id: F2E921C0006 X-Rspamd-Server: rspam02 X-Stat-Signature: xhtmx6cd6fwzugek3q7m1b86bnfy1jsb X-HE-Tag: 1760444011-714197 X-HE-Meta: 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 /toVy4FU 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 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: On 14.10.25 13:33, Kefeng Wang wrote: > If the pte_protnone() is true, we could avoid unnecessary struct page > accessing and reduce cache footprint when scanning page tables for prot > numa, the performance test of pmbench memory accessing benchmark > should be benifit, see more commit a818f5363a0e ("autonuma: reduce cache > footprint when scanning page tables"). > > Reviewed-by: Sidhartha Kumar > Signed-off-by: Kefeng Wang > --- Acked-by: David Hildenbrand -- Cheers David / dhildenb