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t=1783320927; bh=zMtLSNfy7XDiRALlmO3rgrfVc43zWl2hltbEKjLLbGE=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=OH21rkP7GIl56sZQ9WPfrU//nny8/5DsiJ1PFp07qAsF+nlE3V6lubtYUY/4BQTO3 G23eAuBA6pgVtDKeFXSvKmY8m7tSnDItnhZSbUsRNwlzx+Ql1I5PrmM9pNzhXyEFg8 p1ELHg7Y78AxZtWLZ4Cew1OdUd3U2HlFCXOTF8j/2lUejKHY3PGqgsHFw/1wMxD9cz qZL9rrwzowQvMzqG8+phXkYTXvaftoqNjgC67+3NnTYhKMVWIZGOxUYoM9U6OUOJv6 Ryh18ZvCD9O3TxE1ZUqfNJakt3cfOt/fQG/amw9ansHOskm6OmeM6GSGirhiNHnuS3 umrIJIL5PUnIw== Message-ID: Date: Mon, 6 Jul 2026 08:55:23 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v11 3/3] ksm: add mremap selftests for ksm_rmap_walk To: xu.xin16@zte.com.cn, akpm@linux-foundation.org Cc: chengming.zhou@linux.dev, hughd@google.com, wang.yaxin@zte.com.cn, linux-mm@kvack.org, linux-kernel@vger.kernel.org, ljs@kernel.org References: <20260703162637070FU4ekl58Hw_Z7OSuJryZB@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: <20260703162637070FU4ekl58Hw_Z7OSuJryZB@zte.com.cn> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 39CCB1A0002 X-Stat-Signature: yjpf8a8emofhb3wbsdfhkyo9c5c4t1py X-HE-Tag: 1783320928-873777 X-HE-Meta: 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 gh2HFMam CCgy+vVhlXgwkqdNuBmNsi9YwWvK1TsGUsjXJQBebQ3FyZKRzh4l8BjeOLNR+p6TIfl78tMKY3YFjfWQnOpqapYPhwdJ+5pn+TNfBd08B/FGqiOnnztlrIuFMLzSSUCpC5AemFslfzhuRKidrZ+pN6jCMi4PkEQ2HM0KSX6LyBlHZKW9d+4hFJfq+p7CDHedc9lcckszNOkEx1G++DAsnBKLauZhtu73exn/6fcdpmTGLNopeexRpC0n3cn12N61MBiJw3VcAsk/b++/+kucPnRr1rPqusCXT7/qDQfPETXKTS/YkSsij8ExLxnrIRMQZmfOTWmQffMquFsbAYGdQgG6JHNGdWmy23QgXh1mRvflna6mko0TQfDe5hB17EvaG5+I8WK+2EcM9syWgZg1fi0PVnh8CKU7/ERW3 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/3/26 10:26, xu.xin16@zte.com.cn wrote: > From: xu xin > > The existing tools/testing/selftests/mm/rmap.c has already one testcase > for ksm_rmap_walk in TEST_F(migrate, ksm), which takes use of migration > of page from one NUMA node to another NUMA node. However, it just lacks > the scenario of mremapped VMAs. > > We add the calling of mremap() and then trigger KSM to merge pages before > migrating, which is specifically to test an optimization which is > introduced by this patch ("ksm: Optimize rmap_walk_ksm by passing a > suitable address pgoff"). > > This test can reproduce the issue that Hugh points out at > https://lore.kernel.org/all/02e1b8df-d568-8cbb-b8f6-46d5476d9d75@google.com/ > > Signed-off-by: xu xin > --- Acked-by: David Hildenbrand (Arm) -- Cheers, David