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Tue, 23 Dec 2025 13:48:50 +0800 From: Baolin Wang To: akpm@linux-foundation.org, david@kernel.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, baolin.wang@linux.alibaba.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 4/5] arm64: mm: implement the architecture-specific clear_flush_young_ptes() Date: Tue, 23 Dec 2025 13:48:38 +0800 Message-ID: X-Mailer: git-send-email 2.43.7 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam02 X-Stat-Signature: ayw3mhhb6zk6z5rxr6ajjfxauwhy3o9p X-Rspam-User: X-Rspamd-Queue-Id: 9ACD0C0003 X-HE-Tag: 1766468935-42810 X-HE-Meta: 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 mPmvo7Vm 3tAlvQiRVisEAY3P/Vodfaa/RynUDvXG9eWLMbmMXiAmkV/l7JdtZEbATYjPgL48YoakSb3gdvelfCi0gOyB79KcAE95eKPWJ2ImOFRXcQeN2I2gANLIiMFsXVKAiyW/IsrzA2r/Y3c/Pc91QnYRJTv3q0YNdVM7SgwAvnsaiZeyhOnbaZZCFKl++8Cx2Ya86lynQdq0EKmzX9LxNlLPt3W1aPDYsVxxVm4HnEtE1nyS5A4zPDYn78SYrB6DLwF7d0gobLXM1O00+wq3AfoB2WRKCz2I9ZCRRPJJ7unNY7q7wjw8= 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: Implement the Arm64 architecture-specific clear_flush_young_ptes() to enable batched checking of young flags and TLB flushing, improving performance during large folio reclamation. 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 33% performance improvement on my Arm64 32-core server (and 10%+ improvement on my X86 machine). Meanwhile, the hotspot folio_check_references() dropped from approximately 35% to around 5%. W/o patchset: real 0m1.518s user 0m0.000s sys 0m1.518s W/ patchset: real 0m1.018s user 0m0.000s sys 0m1.018s Signed-off-by: Baolin Wang --- arch/arm64/include/asm/pgtable.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index d5fbe72e820a..84a6bdabb1f9 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -1838,6 +1838,17 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma, return contpte_clear_flush_young_ptes(vma, addr, ptep, CONT_PTES); } +#define clear_flush_young_ptes clear_flush_young_ptes +static inline int clear_flush_young_ptes(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, + unsigned int nr) +{ + if (likely(nr == 1 && !pte_cont(__ptep_get(ptep)))) + return __ptep_clear_flush_young(vma, addr, ptep); + + return contpte_clear_flush_young_ptes(vma, addr, ptep, nr); +} + #define wrprotect_ptes wrprotect_ptes static __always_inline void wrprotect_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep, unsigned int nr) -- 2.47.3