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(p200300d82f287c00a95eac49f2adab84.dip0.t-ipconnect.de. [2003:d8:2f28:7c00:a95e:ac49:f2ad:ab84]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-447f1ef0ab8sm31378915e9.13.2025.05.20.06.33.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 20 May 2025 06:33:57 -0700 (PDT) Message-ID: <39861ba3-078e-40ad-bb9e-43baff981ac9@redhat.com> Date: Tue, 20 May 2025 15:33:56 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 0/4] Make MIGRATE_ISOLATE a standalone bit To: Zi Yan Cc: Vlastimil Babka , Oscar Salvador , Johannes Weiner , linux-mm@kvack.org, Andrew Morton , Baolin Wang , "Kirill A . Shutemov" , Mel Gorman , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Richard Chang , linux-kernel@vger.kernel.org References: <20250509200111.3372279-1-ziy@nvidia.com> <794d741f-44ac-4cd8-97e8-091f12387f39@redhat.com> <0A1FA061-9E8E-4E86-A479-EFA9FF083D4F@nvidia.com> <43ab8a08-b577-4e6d-8920-1761ffbc01fc@redhat.com> <7AE9C2E9-2EC8-42E3-A3A5-3E4458796A51@nvidia.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: <7AE9C2E9-2EC8-42E3-A3A5-3E4458796A51@nvidia.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: k0spby5a9LsZHMrXr5BUmQgrxP_SuyDXorFcGK6q6yc_1747748038 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam10 X-Stat-Signature: mupukzz8d1cgjcuzpee39c96myc7t3bp X-Rspamd-Queue-Id: 30F0020018 X-Rspam-User: X-HE-Tag: 1747748041-963904 X-HE-Meta: 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 wmZJzAu2 jPyrEWFVLYOaDezVNh2T5Yq4oz5DnXYu7/+dZurMRK5My/xILz+rkC2Te2r7CH58CgsVMmfIgBaJqNIqi+d/MhOc4YmWdcOFafHISg6rwh6CIYBzJr3fWoYdZ6hqqxKvSD523In/aLUBvIKTEeYHjIAtVsQjwPXNAIUJkR8SjLWujtAzzxBXsFZfsEr9b/kXzpnmu1Rh1Vj2WtwN+IzM/TExvisnPyK0LTwjIarixXAjxLpRVRmECnsCuk0AuE/8KpjAtW0IcihlIK+jkP82l40KRQtZ8zmNWF+KzZx7YV2MBJJl6DAP65rljIeI46lP9WhLqPfOSwnHkJE9Lljs2YUgTVmBTl3wYTdmes6b3p007aMJm7yvZgRbAygtgZrhpzTjQDVG/tAECU4CbJWKQ2OaR7LUN7auoxaxUymVNrxAlZ31Fc+Ue6rJjlFRD776Yvx2AC9XqYEMjOlQ= 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 20.05.25 15:31, Zi Yan wrote: > On 20 May 2025, at 9:20, David Hildenbrand wrote: > >>>> if a page gets freed while the pageblock is isolated, it cannot get added to the list of an owner easily. >>> >>> Right. In theory, it is possible, since when a MIGRATED_ISOLATE page is freed, >>> __free_one_page() can find its buddy and add the freed page to its buddy's >>> buddy_list without performing a merge like current code. But it needs a new >>> code path in __add_to_free_list(), since it is not added to the head nor the >>> tail of a free list. >> >> But what if the whole pageblock gets freed in a single shot (IOW, there is no buddy to lookup the list for?). > And thinking about it, another problem is if a page gets freed that has no buddies. > You are right. This means when MIGRATE_ISOLATE is removed, the global > MIGRATE_ISOLATE free list stays. Right. We could just have that one separately from the existing array. -- Cheers, David / dhildenb