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b=mZ3eeO11D/oUQS5v/btfeH+KWSUiDv716YAlCn9LG2lty+rSDU7bVaDkiy2gsYbOc tb7t9bCUReDJg0aSKPdg6GDM4sIKmfN3JmSszRhtnEwwYou3j81zWwrsUVmezU6QZG 9lVKlgakyr7WUWz+DNZB5R+9i9S3OHB3jUaWsdDowDqUv6/EISKW7HFFbAjnqwEe6d X6oDyTDHUz3gfJpDZJzPwXA+IUFh77CV8pnlEySdq5U8dreLDebPt+iHr6SKMtMcBK yKjq8uYdG03BfvkCR8MGJTmcaCExoQ02SlTgoH98wSKLPMUxTLTm2XyNs2nDcHEpE0 QTAqgbBxufOHA== Message-ID: <9b7afb6a-b709-4b42-a4dc-fa12c2ca624c@kernel.org> Date: Mon, 9 Feb 2026 16:31:13 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 5/5] mm: rmap: support batched unmapping for file 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 (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: DE134C0018 X-Stat-Signature: pan5jebfxps816zdx6gn6sur83dcoeob X-Rspam-User: X-HE-Tag: 1770651083-252148 X-HE-Meta: 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 TdyL2ARh 7Lw9aB4Wo+6yZdNzL0IcKBDT38oegkhMq4KBp3azgvz0x7XVVTwb0rpU+MEdYM09zWYx8ytwBIE0sHUxw1gRsUrgRe8CyrLOPRtNjPeEIhzMzBquHKna4v9GPSdv/+8E1+XvM2PY+Cm8qrdyAKJBzlYSzqJm6+7pO4hBdZ1A3p+pJsLMINueMYMSJUQGEFKMC8iHE3ygAYnG8d25vx46/lZ398LA1wAEdOJtj95MQ+aO469EXtP5kPiFLj4wOOUvB2kaJde9oSXKSoiWU7a42JXlrMD2OOaPXDH7xnTaM+YbEbeRdd4aHeu5S4FBbR0a1ug81WlbQxa1hsaUfS4WXR9wWvUj3KKiTwwz9KRg346/GBLU9+4OAYIdWs8AALooPXWRwk0WxTmIISvBuoGoCMQ7epCMgW83U+vhU 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 2/9/26 15:07, Baolin Wang wrote: > Similar to folio_referenced_one(), we can apply batched unmapping for file > large folios to optimize the performance of file folios reclamation. > > Barry previously implemented batched unmapping for lazyfree anonymous large > folios[1] and did not further optimize anonymous large folios or file-backed > large folios at that stage. As for file-backed large folios, the batched > unmapping support is relatively straightforward, as we only need to clear > the consecutive (present) PTE entries for file-backed large folios. > > Note that it's not ready to support batched unmapping for uffd case, so > let's still fallback to per-page unmapping for the uffd case. > > Performance testing: > Allocate 10G clean file-backed folios by mmap() in a memory cgroup, and try to > reclaim 8G file-backed folios via the memory.reclaim interface. I can observe > 75% performance improvement on my Arm64 32-core server (and 50%+ improvement > on my X86 machine) with this patch. > > W/o patch: > real 0m1.018s > user 0m0.000s > sys 0m1.018s > > W/ patch: > real 0m0.249s > user 0m0.000s > sys 0m0.249s > > [1] https://lore.kernel.org/all/20250214093015.51024-4-21cnbao@gmail.com/T/#u > Reviewed-by: Ryan Roberts > Acked-by: Barry Song > Reviewed-by: Harry Yoo > Signed-off-by: Baolin Wang Acked-by: David Hildenbrand (Arm) -- Cheers, David