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b=WKVmyBqz6CznqEnFUEpNoZ8OOwktJHVXETw5slKol1Q5o5AxE9VyPdjR0SjA77on2 +v6KL2KikLGQtFQ5seBiJrmr14KsMvtR0+qgxMU1T3CGQKOZOQauZiF2f4a48JN7ff +YaNHyEaBi9PTbJcQsswv9X5wK3dyRPfN7eFT7QteKTn430P+AqtBkaG9EtcHWJG5i uk/WM09jkhiffuaswXCI4UQL0fS2Xhu1uc7MAAgRD3GZEEnNGYgOwxSrKwsrwZGQ7v iFeZUNeEt4gnXKnqbwZY0pWBJVWNXHpHzlEo0Lrt5I5AqiDt4X+WZWQv31v4H/oPQW /O3ng9otzZVkw== Message-ID: <7c5295ae-4546-4e33-9074-8c2adfd2bc13@kernel.org> Date: Mon, 9 Mar 2026 15:40:05 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 6/6] arm64: mm: implement the architecture-specific test_and_clear_young_ptes() To: Baolin Wang , akpm@linux-foundation.org Cc: catalin.marinas@arm.com, will@kernel.org, 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, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, hannes@cmpxchg.org, zhengqi.arch@bytedance.com, shakeel.butt@linux.dev, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <7f891d42a720cc2e57862f3b79e4f774404f313c.1772778858.git.baolin.wang@linux.alibaba.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 7F5B5160008 X-Stat-Signature: oanjpertpx9zsax465t47ez5wkt35fgk X-Rspam-User: X-HE-Tag: 1773067216-258079 X-HE-Meta: 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 /gxB707V OTM/eVUxdTbWVvdoMg3F5RYvOgWHAsLj0oZ7BE47ZoMQ070dr2asMowUgtbm4h4AXmJKoGQWRgFRYP+B9M9tVU89h+jVgXO5/YfPUxRM3BBaxILnaKT84ZZIa3TO1uaty4ZxTRthdXxDnwJ2WsWraK4TJaIMeKlJVQN2ecC3nehvYQRPQJ1qD5gFSHT6d1qkzcdQ8jaC7ZNFDsgk1lJalm09mxt6ESGS1PB4B/1EQXPPj20kQHf701FktZto2IH6RydKSKKdSEZGRay2ZoGrkb/cniOhG3fsZEhDbRl5YN7Q+9G1m/2X0HikaaN2TwGOHYVcWzN7T8ezBqr6Ij3wpXMRbH4RXK2s6cVqS/Y9CKAM0lS9xq30+IygjSO8M4mMFf2geYY2zASkInnKqaJ5Vm1J2EoRz1wXv20hy Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/6/26 07:43, Baolin Wang wrote: > Implement the Arm64 architecture-specific test_and_clear_young_ptes() to enable > batched checking of young flags, improving performance during large folio > reclamation when MGLRU is enabled. > > While we're at it, simplify ptep_test_and_clear_young() by calling > test_and_clear_young_ptes(). Since callers guarantee that PTEs are present > before calling these functions, we can use pte_cont() to check the CONT_PTE > flag instead of pte_valid_cont(). > > Performance testing: > Enable MGLRU, then 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 60%+ performance improvement on my Arm64 32-core server (and about > 15% improvement on my X86 machine). > > W/o patchset: > real 0m0.470s > user 0m0.000s > sys 0m0.470s > > W/ patchset: > real 0m0.180s > user 0m0.001s > sys 0m0.179s > > Reviewed-by: Rik van Riel > Signed-off-by: Baolin Wang > --- Reviewed-by: David Hildenbrand (Arm) -- Cheers, David