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b=Lho/GWYkGrBHkMfmwLwfv6NqJTWcb2ohNsjvFDssYybPnjyq1AUnoIPuYYFMlkVDD UUv6gqkbIUr9IKAN5hjIPhC6yCV8ikXP6AUTCCKUXwZsCFHKaRJpcqJzP+b73S0qH+ 4jPOVLQ2c4oqHEh4bQ2LAmUK3X03ZdiCsagawrCScneU+XH4EIDuyBGz/oh2aCZ0iO UtcHvWMfGOgxnpMnGxqhBKfv2a0blF9c5cjYNrtZ7FwTvb6oPwk/C02e3wi9fKrAcQ usrunzTQ0/YoAclMdQYUGmKZglio6NbMCHM5LgvfmVTjv0yjhKMPjX+0Ji2bwEy12o kZwrmxIvA8ovg== Message-ID: <1cf4efb5-1876-482e-8a92-a211570e91c8@kernel.org> Date: Thu, 9 Jul 2026 10:53:20 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RESEND 2/2] mm/ksm: Use precise linear_page_index instead of the whole address space To: xu.xin16@zte.com.cn, akpm@linux-foundation.org Cc: chengming.zhou@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20260709111055267XMDer8X5AKmOhy46TRjwa@zte.com.cn> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+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: <20260709111055267XMDer8X5AKmOhy46TRjwa@zte.com.cn> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: B753740007 X-Stat-Signature: xu7adkwac8gcj66wwuhcfs1b6fe3zkij X-HE-Tag: 1783587205-743984 X-HE-Meta: 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 lzhpd6Zc EXEgCfKnjAdFfSSDjrB0Xupz7FOkaNrFDWZ+bZQRQizMUvhb5mBKF/1AmaVXCtljmchY4u5K5nDVDhcbqVaiEIBOCbK5v2h5+nA2GquL/JZymjt9E9jYUrLPf5GlZYOZX44cBs8QrZZtgIvDzIVpHpyJSusrpdtG4vHEaU5PkHKOtazRc/Z7vPzP2/fiKnCiuh8U2oxHhpCCExrGFxS9nEjZ+ZOeu/3FRnmUoayXAzX2B6Z1bNKsrpOCtL7VWTgqiMsoSA8sOMC8bTfqkX2iItZ7jGYHeXNLWeUIJ4aMQNhkSICmFgfCaNffFRkr1jzciQenU7/V6Q4dgKf5z/FQ9zyWzlxQFQ2VPf1DNYU9LKZ7GKVg= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/9/26 05:10, xu.xin16@zte.com.cn wrote: >>> From: xu xin >>> >>> Since an earlier commit introduced the linear_page_index to struct >>> ksm_rmap_item[1], allowing for optimizing the RMAP walk, we can use it >>> to locate more precisely all processes that hit the KSM page, which will >>> decrease a lot of unvalid iterations. >> >> It's awkward to reference a commit by a mailing list link. The other patch is >> not upstream yet. Best to wait for that to go in first, so you can properly >> reference the commit. > > Ok, I'm going to resend this after that referenced patch is upstream. Alternatively, just mention that we now have linear_page_index available that we can use here, without referring to the other patch/commit. That would probably be cleanest. -- Cheers, David