[PATCH v1 10/11] mm/memory: ignore dirty/accessed/soft-dirty bits in folio_pte_batch()
From: David Hildenbrand <hidden>
Date: 2024-01-22 19:43:14
Also in:
linux-mm, linux-riscv, linux-s390, linuxppc-dev, lkml, sparclinux
Subsystem:
memory management, memory management - core, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds
Let's ignore these bits: they are irrelevant for fork, and will likely be irrelevant for upcoming users such as page unmapping. Signed-off-by: David Hildenbrand <redacted> --- mm/memory.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/mm/memory.c b/mm/memory.c
index f563aec85b2a8..341b2be845b6e 100644
--- a/mm/memory.c
+++ b/mm/memory.c@@ -953,24 +953,30 @@ static __always_inline void __copy_present_ptes(struct vm_area_struct *dst_vma, set_ptes(dst_vma->vm_mm, addr, dst_pte, pte, nr); } +static inline pte_t __pte_batch_clear_ignored(pte_t pte) +{ + return pte_clear_soft_dirty(pte_mkclean(pte_mkold(pte))); +} + /* * Detect a PTE batch: consecutive (present) PTEs that map consecutive * pages of the same folio. * * All PTEs inside a PTE batch have the same PTE bits set, excluding the PFN. + * the accessed bit, dirty bit and soft-dirty bit. */ static inline int folio_pte_batch(struct folio *folio, unsigned long addr, pte_t *start_ptep, pte_t pte, int max_nr) { unsigned long folio_end_pfn = folio_pfn(folio) + folio_nr_pages(folio); const pte_t *end_ptep = start_ptep + max_nr; - pte_t expected_pte = pte_next_pfn(pte); + pte_t expected_pte = __pte_batch_clear_ignored(pte_next_pfn(pte)); pte_t *ptep = start_ptep + 1; VM_WARN_ON_FOLIO(!pte_present(pte), folio); while (ptep != end_ptep) { - pte = ptep_get(ptep); + pte = __pte_batch_clear_ignored(ptep_get(ptep)); if (!pte_same(pte, expected_pte)) break;
--
2.43.0
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