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Fri, 19 Dec 2025 14:03:08 +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 v3 4/5] arm64: mm: implement the architecture-specific clear_flush_young_ptes() Date: Fri, 19 Dec 2025 14:02:54 +0800 Message-ID: <511d0f46d5f02f5e1ecc67318bc2ce8997208c85.1766121341.git.baolin.wang@linux.alibaba.com> X-Mailer: git-send-email 2.43.7 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: CE3424000B X-Stat-Signature: e58kqgmx6nhdcop8uuwauj5q8i51nqyk X-HE-Tag: 1766124192-683825 X-HE-Meta: U2FsdGVkX1/isTRXouwz+Am4T0DXF5RAmGIv54fptms0x+kbuggAzg6rFqnz+wVL0e8Rvh5sZwsqh7XT+JzUtSgcNgUOEOF+k57YHM76/aM4MZfo4+kTOv/PpdPwD3jqtUz2sZgFCt/hSgCtobDpbOxWHPnaMz2Oqsd7D6sLbfASd5B/O2HtalqLt82RcKvtkV9nQ3KR0kOUbWLCG8eJpmXF+sWcNoIHb2EzG/kRM0pQ8DI1XkbkdwDTk/weLcc+89afK20Z6XhGMrx5dX3OaWFncGval8BcwAW1ARoaNDIpjRGFBxd44frR34fkf2CDxEZFQe70gDfcITQGp8fg7DP0CPQiVO2C0gNvyY0FU52AyXltlnJMr2X2tQ2TxOik0Mi6CQ2YCRhpLoaVGcvhFGl4YnWPcOXOoosQ54gAgpm4848jF96ggEtfxYDqT0dGV4+P6zfpQxkDIqjS5tLn21CtRyV8iKhgvI79nNhRe0YNxbc2KFyhdKF9mXgjfkvAnXhB4mXlS+7UcpF2TCqw1gEvTHbl5iZH3tY95u3dxMAjWMHCKtk2wwn6yLfdEJen9PESnEEABpoUQiEZpZ1hKrtlmXpghjvK6Q0OdG/YAkCTmdW2kjQptWook58vSko21dh86Uvg8oAPFVsUyMZ+e/VbXp3xweS56AnFfAatwsZ168WhzGUf38ERGJ3BblpkSSzdX9mXGjrWihMH+OWT4hpqyQHmIJUb9kqb695M+HEuYgd3O+ftk3tq1nTLO1MZb8DKNbO++z0YXvFOIUoWt1Fpos/MDx9KgSIpoIZwU7oIb/wLsS35Swz0HZqzqhtKZMxmrscZMAFqGMqSJoaZ8rYiBTj5KWAEkNTtI+psEVnfyB/YNNMYycPTnFhZaVlzB8QDQHrjd+U5lccCZwk7r2L0u+wULXsKYhui5ox8/kUyIk8R2DF10KQFnanMpUlz7BiA4eyt0IN77ageHKS iYRu0RGs ykkBgGfW0pLVvmNRBGZNwgZ3P1uQ1OuzZ3lEa55O1DrYRCXLFcvMYWd0BLuLSOuQtZo7yinHWy2wk824yi344Q6FeNdlWiWrQYnPQuWHb1wNS7XOeHEhEt0x5SQBtH5vlqUycye0N1PZvwPx/m9wIE0Dey9F4D5DRAMeJhojeI0v8FvNB/vfD9R1cvQskvhl/c5J+XX4+3BrgiLIoMNzMKhApSFnHTWKw1gtXUUh8vRZD6iozzZiPEoYYx73mCZasmIU6m6QsHForQOvdsiQSPcpwL5sU1wQxXurvF3kBsAcaJ0w= 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 9086753f68b4..c57eda654d9b 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -1869,6 +1869,17 @@ 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