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[80.187.83.110]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4255d8f011bsm19722250f8f.46.2025.10.05.23.46.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 05 Oct 2025 23:46:38 -0700 (PDT) Message-ID: <488a0640-9096-41d0-9a5f-34ba5f2a279c@redhat.com> Date: Mon, 6 Oct 2025 08:46:35 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 4/4] mm: thp: reparent the split queue during memcg offline To: Qi Zheng , hannes@cmpxchg.org, hughd@google.com, mhocko@suse.com, roman.gushchin@linux.dev, shakeel.butt@linux.dev, muchun.song@linux.dev, lorenzo.stoakes@oracle.com, ziy@nvidia.com, harry.yoo@oracle.com, baolin.wang@linux.alibaba.com, Liam.Howlett@oracle.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, Qi Zheng References: 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 ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+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: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: tfee_ozbNWfSFEC10Ru878cLJwlSyywgdRPRy9u73qo_1759733199 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 73E1680009 X-Rspamd-Server: rspam05 X-Stat-Signature: xhku7zpptbajg4nz3iwffyomu5pr3aom X-Rspam-User: X-HE-Tag: 1759733202-307669 X-HE-Meta: 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 jMyAsD4U 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 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 03.10.25 18:53, Qi Zheng wrote: > From: Qi Zheng > > Similar to list_lru, the split queue is relatively independent and does > not need to be reparented along with objcg and LRU folios (holding > objcg lock and lru lock). So let's apply the similar mechanism as list_lru > to reparent the split queue separately when memcg is offine. > > This is also a preparation for reparenting LRU folios. > Much cleaner IMHO Acked-by: David Hildenbrand -- Cheers David / dhildenb