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Fri, 26 Dec 2025 14:08:12 +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 v5 4/5] arm64: mm: implement the architecture-specific clear_flush_young_ptes() Date: Fri, 26 Dec 2025 14:07:58 +0800 Message-ID: <9d866a2644051e13a41ef4d6ca3909c6e1f9e229.1766631066.git.baolin.wang@linux.alibaba.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 8qu1hr85oum4ufg7tbxg4pedkdnofy7a X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: E85AAC0006 X-HE-Tag: 1766729295-967672 X-HE-Meta: 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 /3hnrI25 20027eByeW8dAAWdH5KwQYUT1u08Nzjif0zNPDYFRnJ5RVvA1hS6HiykQ6U2zW4BiWa2RAD5B55xDZBpxMsjjPMR+NyElF5Desw5tVFu54/Ou9lYsbf7116w9w7sow4abmVSQNvba8PvVYx+4k9JmREXL+Uz58SgIR7TPJuUXS296k70F7VsCw1EHSLnYn1j9RRtYW8N0z1KMRqPWZQLryAKViAizUe627NdzR7zu04nA7IFmp8w7TK1wd6ry1xCzR96Uesc8yADBrXQkuIaN54whFHBRGOpBpRslZxxGTaF4a8/oLueBNt/HuyYO9UpAhme3JVOfHNJ/ZSz10+x2HeeJr8RL6Mku4ySYXriDz46w2W0= 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 Reviewed-by: Ryan Roberts 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 5e9ff16146c3..aa8f642f1260 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, 1); } +#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