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b=bqnSDKZXCr+H/gliDf/P2yfcsFo0GD7RbPqm3KaiqOx/JMkml2wvyk+2W7leWkEyw OnsDTR67hBQL+XoqtI+Bn/MKyBbS6X3aCuE4x1He9cp28m84PKH3ggGM2Lws/iSUgK dQowFOkvKtNWCY+9QcKX1f2edmhkdWEPK897ZHQazFGV5OCwlWzKV5rqVr68KqvGsu sKSKls9bnMALR5vIui+1PzyCJ/RXfdO3sebSHCV7zcug5sxTqI79Y06RCo8ANqwi+E hZ7hmSKMGRZL5+1a6fZ1yAROJhdNEJGIv9g/uQy5jlT17ajZ7Wu2lWD9yWrfoO7a+6 zCrxw8vAXBdFQ== Message-ID: <272e2d8b-56b6-4d60-9daa-6743c2fa7209@kernel.org> Date: Wed, 22 Apr 2026 09:19:16 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm: Add RWH_RMAP_EXCLUDE flag to exclude files from rmap sharing To: Pedro Falcato , Yibin Liu Cc: linux-mm@kvack.org, akpm@linux-foundation.org, Liam.Howlett@oracle.com, viro@zeniv.linux.org.uk, brauner@kernel.org, mjguzik@gmail.com, wujianyong@hygon.cn, huangsj@hygon.cn, zhongyuan@hygon.cn References: <20260421020932.3212532-1-liuyibin@hygon.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: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 49A9E140009 X-Stat-Signature: wms9b3fqxix7rkrd4enwmzhxhnoe6y9x X-Rspam-User: X-HE-Tag: 1776842363-859266 X-HE-Meta: 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 IjBf34KP D0KhvoJhYh9Xhq4ezkm6J6J872IlRgx28y4lQAj0iMCuKK7Ho/QQY0M4ou/u3bkKnvJjmNQqX6YPMPOsKWOpe4NYpunZZZLSyltADBpCEJQkM25StzDQS7XJcPFXI9Bfnx+wPRIDIL2CPpx5CzBFFPvshgNNOEXadR2fdkVrXoVch7XwRrLnY/NA6SpQ5ZDBaunfwXESnlwu1RaeMRpC2RgEVRiMRhyOSD85asGY/dpFR8KjandtUMKk4niDsfkWo1tVikIgVofg6dxVkslxitRSLwq/dCefLIfjewdu3+qBFVApjDsDmz4iSAQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: >> @@ -72,6 +72,7 @@ >> #define RWH_WRITE_LIFE_MEDIUM 3 >> #define RWH_WRITE_LIFE_LONG 4 >> #define RWH_WRITE_LIFE_EXTREME 5 >> +#define RWH_RMAP_EXCLUDE 6 > > Userspace does not know what "rmap" is, nor does it need to know. Even if you > found a workable solution for the permission side, this is not a good solution, > and it's not a good interface. It's horrible and I am surprised this patch is not tagged as RFC :) -- Cheers, David