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[79.241.241.207]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-429c13f4732sm2190291f8f.43.2025.10.31.01.20.07 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 31 Oct 2025 01:20:08 -0700 (PDT) Message-ID: Date: Fri, 31 Oct 2025 09:20:06 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 2/3] mm/memory-failure: improve large block size folio handling. To: Zi Yan , linmiaohe@huawei.com, jane.chu@oracle.com Cc: kernel@pankajraghav.com, akpm@linux-foundation.org, mcgrof@kernel.org, nao.horiguchi@gmail.com, Lorenzo Stoakes , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , "Matthew Wilcox (Oracle)" , Wei Yang , Yang Shi , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <20251030014020.475659-1-ziy@nvidia.com> <20251030014020.475659-3-ziy@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 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: <20251030014020.475659-3-ziy@nvidia.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: RK-edEf9NkU-JKAKXJgjMAGoksEz36ykduOExxRYR2M_1761898809 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: 9mfbwphcmt8e9mx84efcnuut3j99hgn4 X-Rspamd-Queue-Id: 975CA4000E X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1761898815-178936 X-HE-Meta: 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 IuIBOJTW PfbMxia/xYacmVvRixx4su2/4mc/o1adbMmj3hiG3VHPPqBPbM2sVwnkdLfMUncg80u8rqKPMxDcmxR64IYrTXwoE5ZOXzPqa2egU527BFK8CsxJvcneKyesnaoZ3gW0VVrwo4QH24Q+xqIMtyND9sCird3X6XwV8ruzVhw+XG5zwZrK3Ro7o7QZWGLZfUKXsLfkcrh2JqFJUWy/k8ca2W5nrjgzdOeDsBAgqHzVS9BfKT2KFUm6FOA1qF/uu4JQvQXDX1s38zCUfa+rbmUa8rfX2GHLOuohD0JUW9ABI2e1lRddqfOJapE9jUCY4CYVrPMRB9mJrqCMdqcqLEt930KS7DQAn5oPbLNMUwG9YRpJ24GUb0lwsK9XaRm15V7MWHcLBy1ctrrzgsHMCJPd9jBYjrCH/9+Oq6bC4l4gy6nKsqHZah/if9DOb3UbMjfqdD6S53+8yMiB1i7W5kTNvMf9MPcuoXTo31uhSGWCbb8uehfY3DrPzxU9VoK/fb85qE8Ub2jId8k3VV7b8ysSNuzdruvJkYVz8F6OZ375YPUgzhn0= 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 30.10.25 02:40, Zi Yan wrote: > Large block size (LBS) folios cannot be split to order-0 folios but > min_order_for_folio(). Current split fails directly, but that is not > optimal. Split the folio to min_order_for_folio(), so that, after split, > only the folio containing the poisoned page becomes unusable instead. > > For soft offline, do not split the large folio if its min_order_for_folio() > is not 0. Since the folio is still accessible from userspace and premature > split might lead to potential performance loss. > > Suggested-by: Jane Chu > Signed-off-by: Zi Yan > Reviewed-by: Luis Chamberlain > Reviewed-by: Lorenzo Stoakes > --- Acked-by: David Hildenbrand -- Cheers David / dhildenb