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Mon, 09 Feb 2026 22:07:41 +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 v6 3/5] arm64: mm: support batch clearing of the young flag for large folios Date: Mon, 9 Feb 2026 22:07:26 +0800 Message-ID: <5644250dcc0417278c266ad37118d27f541fd052.1770645603.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-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: A789B40010 X-Stat-Signature: 1b45u3onhca1kt5cgkpdzwedmypmsu6j X-HE-Tag: 1770646065-97801 X-HE-Meta: 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 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. Reviewed-by: Ryan Roberts Reviewed-by: David Hildenbrand (Arm) 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 d94445b4f3df..3dabf5ea17fa 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, 1); } #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, 1); } #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