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b=RTSTCoOu1dePW9H4OkH93WMmKcmffIRyCILb72Voshdu1/HG1XMdiNqq59tuMyzRQ IlNlaiHsclaJtcSFl/uFfNGQhfgO2MUfsW50Mm42OZLFQB7/4LnEF/IAPnknF0wggf yFEvaP2Ec05ad4spLh6+EKgkqbYaPe+qncz/cJSD4rmOrnp5of/WLm21Ng6muXrRjN yIl27I2S9SQHkI1dFZJ2KxdZP8nmJXZb/pSLq4i2hcDoAI6wvvZVHepRc5BFfOY0bq kB4b2VAGwIU8l002tGAtNcs9eqvr88ckplfOLsVF5pFhjCq/COhEgcFlP6vNn+ASzZ QfkQ1oDtMVv4Q== Message-ID: <3595c849-6b43-440e-8e15-f51d5de0cad6@kernel.org> Date: Fri, 16 Jan 2026 11:52:22 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 0/5] support batch checking of references and unmapping for large folios To: Baolin Wang , akpm@linux-foundation.org, catalin.marinas@arm.com, will@kernel.org Cc: lorenzo.stoakes@oracle.com, ryan.roberts@arm.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, riel@surriel.com, harry.yoo@oracle.com, jannh@google.com, willy@infradead.org, baohua@kernel.org, dev.jain@arm.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: From: "David Hildenbrand (Red Hat)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 5F75D120008 X-Stat-Signature: 614geoujrkpipyxm676akbh6xq8d5cxw X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1768560750-731513 X-HE-Meta: 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 Bv7xGhNN NIrFa1E6a2ECJxel3phu5k/O33sMA2H/i1S41qIatNA7ybLmE4bONdZe1OaUVohFstCD7ezv5SLdPvSFtO4N/Ggr7NbhHp7ag1mu/KtKk93trv5JM6jM1B4SPbo4i8KLHebTL8kHYS6h/WXDyAdRb4I8GqaxmAVxDMET870gYIrgr/vyKrqXYoRdZ/MnBMLOfNFJBwKRSuB9vSlKZCalBSsTdDoQUUxjvGCF/otk/SGfEg+q8PoU5DhoywC8IovF4M2hd 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 12/26/25 07:07, Baolin Wang wrote: > Currently, folio_referenced_one() always checks the young flag for each PTE > sequentially, which is inefficient for large folios. This inefficiency is > especially noticeable when reclaiming clean file-backed large folios, where > folio_referenced() is observed as a significant performance hotspot. > > Moreover, on Arm architecture, which supports contiguous PTEs, there is already > an optimization to clear the young flags for PTEs within a contiguous range. > However, this is not sufficient. We can extend this to perform batched operations > for the entire large folio (which might exceed the contiguous range: CONT_PTE_SIZE). > > Similar to folio_referenced_one(), we can also apply batched unmapping for large > file folios to optimize the performance of file folio reclamation. By supporting > batched checking of the young flags, flushing TLB entries, and unmapping, I can > observed a significant performance improvements in my performance tests for file > folios reclamation. Please check the performance data in the commit message of > each patch. > > Run stress-ng and mm selftests, no issues were found. Baolin, I'm intending to review this, but it might still take me a bit until I get to it. (PTO/vacation and other fun) -- Cheers David