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mm/vmalloc: Enter lazy mmu mode while manipulating vmalloc ptes 

Wrap vmalloc's pte table manipulation loops with
arch_enter_lazy_mmu_mode() / arch_leave_lazy_mmu_mode(). This provides
the arch code with the opportunity to optimize the pte manipulations.

Note that vmap_pfn() already uses lazy mmu mode since it delegates to
apply_to_page_range() which enters lazy mmu mode for both user and
kernel mappings.

These hooks will shortly be used by arm64 to improve vmalloc
performance.

Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Tested-by: Luiz Capitulino <luizcap@redhat.com>
Link: https://lore.kernel.org/r/20250422081822.1836315-11-ryan.roberts@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
pull/1112/head
Ryan Roberts 2025-04-22 09:18:18 +01:00 committed by Will Deacon
parent 06fc959fcf
commit 44562c71e2
1 changed files with 14 additions and 0 deletions
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14
mm/vmalloc.c
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@ -104,6 +104,9 @@ static int vmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
pte = pte_alloc_kernel_track(pmd, addr, mask);
if (!pte)
return -ENOMEM;
arch_enter_lazy_mmu_mode();
do {
if (unlikely(!pte_none(ptep_get(pte)))) {
if (pfn_valid(pfn)) {
@ -127,6 +130,8 @@ static int vmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
set_pte_at(&init_mm, addr, pte, pfn_pte(pfn, prot));
pfn++;
} while (pte += PFN_DOWN(size), addr += size, addr != end);
arch_leave_lazy_mmu_mode();
*mask |= PGTBL_PTE_MODIFIED;
return 0;
}
@ -354,6 +359,8 @@ static void vunmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
unsigned long size = PAGE_SIZE;
pte = pte_offset_kernel(pmd, addr);
arch_enter_lazy_mmu_mode();
do {
#ifdef CONFIG_HUGETLB_PAGE
size = arch_vmap_pte_range_unmap_size(addr, pte);
@ -370,6 +377,8 @@ static void vunmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
ptent = ptep_get_and_clear(&init_mm, addr, pte);
WARN_ON(!pte_none(ptent) && !pte_present(ptent));
} while (pte += (size >> PAGE_SHIFT), addr += size, addr != end);
arch_leave_lazy_mmu_mode();
*mask |= PGTBL_PTE_MODIFIED;
}
@ -515,6 +524,9 @@ static int vmap_pages_pte_range(pmd_t *pmd, unsigned long addr,
pte = pte_alloc_kernel_track(pmd, addr, mask);
if (!pte)
return -ENOMEM;
arch_enter_lazy_mmu_mode();
do {
struct page *page = pages[*nr];
@ -528,6 +540,8 @@ static int vmap_pages_pte_range(pmd_t *pmd, unsigned long addr,
set_pte_at(&init_mm, addr, pte, mk_pte(page, prot));
(*nr)++;
} while (pte++, addr += PAGE_SIZE, addr != end);
arch_leave_lazy_mmu_mode();
*mask |= PGTBL_PTE_MODIFIED;
return 0;
}