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[2003:cb:c710:f400:4580:64b5:8bf5:4809]) by smtp.gmail.com with ESMTPSA id n21-20020adf8b15000000b0033924b4d1f9sm2155636wra.94.2024.02.02.07.26.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 02 Feb 2024 07:26:48 -0800 (PST) Message-ID: <330729ec-cee3-4804-b8b2-eeb1548a1643@redhat.com> Date: Fri, 2 Feb 2024 16:26:47 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/1] mm/khugepaged: skip copying lazyfree pages on collapse To: Lance Yang , Michal Hocko Cc: akpm@linux-foundation.org, zokeefe@google.com, songmuchun@bytedance.com, shy828301@gmail.com, peterx@redhat.com, minchan@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20240201125226.28372-1-ioworker0@gmail.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: 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-Stat-Signature: mzh3eucx1hj4sx7s7hamipg3qyzsiy76 X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 2CDD0C0013 X-Rspam-User: X-HE-Tag: 1706887611-296781 X-HE-Meta: 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 WNBVlCKk PG0e+Q7lyimjbIoqACG6PpEaOGUiqbU7r5/qeVf257sA2dL/cUB5RHIbnDS40LZmnX3a0TOS1Q1342Xofdh4t3W53BQAz2mbUMOz/kyV/BgasxaeWsy7sDvTe/Lj85sJ0tq1W8LI7brRaAnwr0l/z5R5436F4A4rihx8XMDu++SOVaCP4zwwKptN2HCgpUZaBZ43qZYvdk6L8jXudSbaCVCU9NPzsmuG/Wj4uGb3Dv+9HeRyDg7uqLH7L9pwHQ1gObUP6kXrxYYQpl1QdxNp2cg68QICj/VU37dMoAkpcWxUDoOOzpzQthvtiYGvgX2sCmzVZK+XshRHadZMn3dIUzNRe/8qBXrufgavevZ+8qhr+fzua1ZBQLYW1KZvdf/CDuwhPWhbl/j4DV0SUM4tUW0kvr323X1IElUDWBmX7fcObbYE= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000002, 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 02.02.24 15:52, Lance Yang wrote: > How about blocking khugepaged from > collapsing lazyfree pages? This way, > is it not better to keep the semantics > of MADV_FREE? > > What do you think? Why do we even want to change any behavior here? A lot of things "might cause confusion among users". Even worse, a lot of things do cause confusion ;) -- Cheers, David / dhildenb