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Message-ID: <1d71cf419726188dfc41c292dfac066be5cb1e33.1763976541.git.baolin.wang@linux.alibaba.com>
Date: Tue, 25 Nov 2025 08:56:50 +0800
From: Baolin Wang <baolin.wang@...ux.alibaba.com>
To: akpm@...ux-foundation.org,
david@...nel.org,
catalin.marinas@....com,
will@...nel.org
Cc: lorenzo.stoakes@...cle.com,
ryan.roberts@....com,
Liam.Howlett@...cle.com,
vbabka@...e.cz,
rppt@...nel.org,
surenb@...gle.com,
mhocko@...e.com,
riel@...riel.com,
harry.yoo@...cle.com,
jannh@...gle.com,
willy@...radead.org,
baohua@...nel.org,
baolin.wang@...ux.alibaba.com,
linux-mm@...ck.org,
linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] arm64: mm: support batch clearing of the young flag for large folios
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 <baolin.wang@...ux.alibaba.com>
---
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
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