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Thu, 11 Dec 2025 16:17:11 +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, baolin.wang@linux.alibaba.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/3] arm64: mm: support batch clearing of the young flag for large folios Date: Thu, 11 Dec 2025 16:16:54 +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-Queue-Id: 36CAF14000B X-Rspam-User: X-Rspamd-Server: rspam12 X-Stat-Signature: 55fhrs6zrsupqnm8ay8iuh495e411jfs X-HE-Tag: 1765441034-966537 X-HE-Meta: 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 EwvJ8dZV r4w6nHLezKYyPvBmBHroO5ejQTQ//mVuxyk0MLtwu6EMkg2qfarD227uQL7hD6Bc7oErcUZITwF4ojjFCIgO5LxzFHlYUCwphfYFg6ofBYF4M5P9VZg8rQskDTEcoiYGtqvLxaLoFSqH9E/4g6dfW76gccNf9D28V4oF+kPoadfdtGpbqwtDuBdVjI8EuQAE7YbS4JEOMNoa0u1VVWjrBFU2JX8+Q//jNIvBt3hYlGaLLS5/nmSenDRcW8kpQoAr+VGg1 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. 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 | 44 ++++++++++++++++++++++---------- 2 files changed, 37 insertions(+), 19 deletions(-) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 0944e296dd4a..e03034683156 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -1679,10 +1679,10 @@ 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); +extern int contpte_test_and_clear_young_ptes(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, unsigned int nr); +extern 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, @@ -1854,7 +1854,7 @@ 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 @@ -1866,7 +1866,7 @@ 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 c0557945939c..19b122441be3 100644 --- a/arch/arm64/mm/contpte.c +++ b/arch/arm64/mm/contpte.c @@ -488,8 +488,9 @@ 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 @@ -500,39 +501,56 @@ int contpte_ptep_test_and_clear_young(struct vm_area_struct *vma, * having to unfold. */ + unsigned long start = addr; + unsigned long end = start + nr * PAGE_SIZE; int young = 0; int i; - ptep = contpte_align_down(ptep); - addr = ALIGN_DOWN(addr, CONT_PTE_SIZE); + if (pte_cont(__ptep_get(ptep + nr - 1))) + end = ALIGN(end, CONT_PTE_SIZE); - for (i = 0; i < CONT_PTES; i++, ptep++, addr += PAGE_SIZE) - young |= __ptep_test_and_clear_young(vma, addr, ptep); + if (pte_cont(__ptep_get(ptep))) { + start = ALIGN_DOWN(start, CONT_PTE_SIZE); + ptep = contpte_align_down(ptep); + } + + nr = (end - start) / PAGE_SIZE; + for (i = 0; i < nr; i++, ptep++, start += PAGE_SIZE) + young |= __ptep_test_and_clear_young(vma, start, 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 start = addr; + unsigned long end = start + nr * PAGE_SIZE; + + if (pte_cont(__ptep_get(ptep + nr - 1))) + end = ALIGN(end, CONT_PTE_SIZE); + + if (pte_cont(__ptep_get(ptep))) + start = ALIGN_DOWN(start, CONT_PTE_SIZE); + /* * 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, start, 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