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Tue, 23 Dec 2025 13:48:49 +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 3/5] arm64: mm: support batch clearing of the young flag for large folios Date: Tue, 23 Dec 2025 13:48:37 +0800 Message-ID: <3b427d9010a6d52f2b91342760f12be097d21cf6.1766455378.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-Rspamd-Queue-Id: BA43F80007 X-Stat-Signature: baka9dqqte53z8pteyfa97w3o51tc894 X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1766468932-244704 X-HE-Meta: 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 YQZism1i +x7H2xshcaqHppg38M+xMXSDOnW/kNkY6Z9G/Wk7QuhVoA++k8I01B6/8+HWHY2khkDSCyqphCpbenOM3LjFP/lWqYBr3hQEVZ63484vvl2AZFqthOpQWUNi1BGEk4/RC0gJ8T/aOymkJ38rNZPi7Rlv2N+OEQfugS5vqOfD4UxhznnGWVcOB4AcoDRdf8uOLCI0bKSn8nRB37eyiWhXWkb6oJ2p6nGOXk1gzGUv5CckHvP9CDfdEDoHdv9Odtc0MaVJ4 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: Currently, contpte_ptep_test_and_clear_young() and contpte_ptep_clear_flush_young() only clear the young flag and flush TLBs for PTEs within the contiguous range. To support batch PTE operations for other sized large folios in the following patches, adding a new parameter to specify the number of PTEs that map consecutive pages of the same large folio in a single VMA and a single page table. While we are at it, rename the functions to maintain consistency with other contpte_*() functions. Signed-off-by: Baolin Wang --- arch/arm64/include/asm/pgtable.h | 12 ++++++------ arch/arm64/mm/contpte.c | 33 ++++++++++++++++++-------------- 2 files changed, 25 insertions(+), 20 deletions(-) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 445e18e92221..d5fbe72e820a 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -1648,10 +1648,10 @@ extern void contpte_clear_full_ptes(struct mm_struct *mm, unsigned long addr, extern pte_t contpte_get_and_clear_full_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep, unsigned int nr, int full); -extern int contpte_ptep_test_and_clear_young(struct vm_area_struct *vma, - unsigned long addr, pte_t *ptep); -extern int contpte_ptep_clear_flush_young(struct vm_area_struct *vma, - unsigned long addr, pte_t *ptep); +int contpte_test_and_clear_young_ptes(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, unsigned int nr); +int contpte_clear_flush_young_ptes(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, unsigned int nr); extern void contpte_wrprotect_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep, unsigned int nr); extern int contpte_ptep_set_access_flags(struct vm_area_struct *vma, @@ -1823,7 +1823,7 @@ static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, if (likely(!pte_valid_cont(orig_pte))) return __ptep_test_and_clear_young(vma, addr, ptep); - return contpte_ptep_test_and_clear_young(vma, addr, ptep); + return contpte_test_and_clear_young_ptes(vma, addr, ptep, CONT_PTES); } #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH @@ -1835,7 +1835,7 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma, if (likely(!pte_valid_cont(orig_pte))) return __ptep_clear_flush_young(vma, addr, ptep); - return contpte_ptep_clear_flush_young(vma, addr, ptep); + return contpte_clear_flush_young_ptes(vma, addr, ptep, CONT_PTES); } #define wrprotect_ptes wrprotect_ptes diff --git a/arch/arm64/mm/contpte.c b/arch/arm64/mm/contpte.c index e4ddeb46f25d..b929a455103f 100644 --- a/arch/arm64/mm/contpte.c +++ b/arch/arm64/mm/contpte.c @@ -508,8 +508,9 @@ pte_t contpte_get_and_clear_full_ptes(struct mm_struct *mm, } EXPORT_SYMBOL_GPL(contpte_get_and_clear_full_ptes); -int contpte_ptep_test_and_clear_young(struct vm_area_struct *vma, - unsigned long addr, pte_t *ptep) +int contpte_test_and_clear_young_ptes(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, + unsigned int nr) { /* * ptep_clear_flush_young() technically requires us to clear the access @@ -518,41 +519,45 @@ int contpte_ptep_test_and_clear_young(struct vm_area_struct *vma, * contig range when the range is covered by a single folio, we can get * away with clearing young for the whole contig range here, so we avoid * having to unfold. + * + * The 'nr' means consecutive (present) PTEs that map consecutive pages + * of the same large folio in a single VMA and a single page table. */ + unsigned long end = addr + nr * PAGE_SIZE; int young = 0; - int i; - ptep = contpte_align_down(ptep); - addr = ALIGN_DOWN(addr, CONT_PTE_SIZE); - - for (i = 0; i < CONT_PTES; i++, ptep++, addr += PAGE_SIZE) + ptep = contpte_align_addr_ptep(&addr, &end, ptep, nr); + for (; addr != end; ptep++, addr += PAGE_SIZE) young |= __ptep_test_and_clear_young(vma, addr, ptep); return young; } -EXPORT_SYMBOL_GPL(contpte_ptep_test_and_clear_young); +EXPORT_SYMBOL_GPL(contpte_test_and_clear_young_ptes); -int contpte_ptep_clear_flush_young(struct vm_area_struct *vma, - unsigned long addr, pte_t *ptep) +int contpte_clear_flush_young_ptes(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, + unsigned int nr) { int young; - young = contpte_ptep_test_and_clear_young(vma, addr, ptep); + young = contpte_test_and_clear_young_ptes(vma, addr, ptep, nr); if (young) { + unsigned long end = addr + nr * PAGE_SIZE; + + contpte_align_addr_ptep(&addr, &end, ptep, nr); /* * See comment in __ptep_clear_flush_young(); same rationale for * eliding the trailing DSB applies here. */ - addr = ALIGN_DOWN(addr, CONT_PTE_SIZE); - __flush_tlb_range_nosync(vma->vm_mm, addr, addr + CONT_PTE_SIZE, + __flush_tlb_range_nosync(vma->vm_mm, addr, end, PAGE_SIZE, true, 3); } return young; } -EXPORT_SYMBOL_GPL(contpte_ptep_clear_flush_young); +EXPORT_SYMBOL_GPL(contpte_clear_flush_young_ptes); void contpte_wrprotect_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep, unsigned int nr) -- 2.47.3