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authorMike Kravetz <mike.kravetz@oracle.com>2022-06-21 16:56:19 -0700
committerakpm <akpm@linux-foundation.org>2022-07-17 17:14:34 -0700
commit4ddb4d91b82f4b64458fe35bc8e395c7c082ea2b (patch)
tree449484e4667b83538c62bee7a2ed993861c06250 /mm/hugetlb.c
parent1bcdb769f9e0ad7a17891772e6b5414a2945714f (diff)
hugetlb: do not update address in huge_pmd_unshare
As an optimization for loops sequentially processing hugetlb address ranges, huge_pmd_unshare would update a passed address if it unshared a pmd. Updating a loop control variable outside the loop like this is generally a bad idea. These loops are now using hugetlb_mask_last_page to optimize scanning when non-present ptes are discovered. The same can be done when huge_pmd_unshare returns 1 indicating a pmd was unshared. Remove address update from huge_pmd_unshare. Change the passed argument type and update all callers. In loops sequentially processing addresses use hugetlb_mask_last_page to update address if pmd is unshared. [sfr@canb.auug.org.au: fix an unused variable warning/error] Link: https://lkml.kernel.org/r/20220622171117.70850960@canb.auug.org.au Link: https://lkml.kernel.org/r/20220621235620.291305-4-mike.kravetz@oracle.com Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Acked-by: Muchun Song <songmuchun@bytedance.com> Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: David Hildenbrand <david@redhat.com> Cc: James Houghton <jthoughton@google.com> Cc: kernel test robot <lkp@intel.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Mina Almasry <almasrymina@google.com> Cc: Naoya Horiguchi <naoya.horiguchi@linux.dev> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Peter Xu <peterx@redhat.com> Cc: Rolf Eike Beer <eike-kernel@sf-tec.de> Cc: Will Deacon <will@kernel.org> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/hugetlb.c')
-rw-r--r--mm/hugetlb.c44
1 files changed, 17 insertions, 27 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 95fd1c36c17f..96635a2874e3 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -4935,7 +4935,6 @@ int move_hugetlb_page_tables(struct vm_area_struct *vma,
struct mm_struct *mm = vma->vm_mm;
unsigned long old_end = old_addr + len;
unsigned long last_addr_mask;
- unsigned long old_addr_copy;
pte_t *src_pte, *dst_pte;
struct mmu_notifier_range range;
bool shared_pmd = false;
@@ -4963,14 +4962,10 @@ int move_hugetlb_page_tables(struct vm_area_struct *vma,
if (huge_pte_none(huge_ptep_get(src_pte)))
continue;
- /* old_addr arg to huge_pmd_unshare() is a pointer and so the
- * arg may be modified. Pass a copy instead to preserve the
- * value in old_addr.
- */
- old_addr_copy = old_addr;
-
- if (huge_pmd_unshare(mm, vma, &old_addr_copy, src_pte)) {
+ if (huge_pmd_unshare(mm, vma, old_addr, src_pte)) {
shared_pmd = true;
+ old_addr |= last_addr_mask;
+ new_addr |= last_addr_mask;
continue;
}
@@ -5035,10 +5030,11 @@ static void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct
}
ptl = huge_pte_lock(h, mm, ptep);
- if (huge_pmd_unshare(mm, vma, &address, ptep)) {
+ if (huge_pmd_unshare(mm, vma, address, ptep)) {
spin_unlock(ptl);
tlb_flush_pmd_range(tlb, address & PUD_MASK, PUD_SIZE);
force_flush = true;
+ address |= last_addr_mask;
continue;
}
@@ -6327,7 +6323,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
continue;
}
ptl = huge_pte_lock(h, mm, ptep);
- if (huge_pmd_unshare(mm, vma, &address, ptep)) {
+ if (huge_pmd_unshare(mm, vma, address, ptep)) {
/*
* When uffd-wp is enabled on the vma, unshare
* shouldn't happen at all. Warn about it if it
@@ -6337,6 +6333,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
pages++;
spin_unlock(ptl);
shared_pmd = true;
+ address |= last_addr_mask;
continue;
}
pte = huge_ptep_get(ptep);
@@ -6759,11 +6756,11 @@ out:
* 0 the underlying pte page is not shared, or it is the last user
*/
int huge_pmd_unshare(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long *addr, pte_t *ptep)
+ unsigned long addr, pte_t *ptep)
{
- pgd_t *pgd = pgd_offset(mm, *addr);
- p4d_t *p4d = p4d_offset(pgd, *addr);
- pud_t *pud = pud_offset(p4d, *addr);
+ pgd_t *pgd = pgd_offset(mm, addr);
+ p4d_t *p4d = p4d_offset(pgd, addr);
+ pud_t *pud = pud_offset(p4d, addr);
i_mmap_assert_write_locked(vma->vm_file->f_mapping);
BUG_ON(page_count(virt_to_page(ptep)) == 0);
@@ -6773,14 +6770,6 @@ int huge_pmd_unshare(struct mm_struct *mm, struct vm_area_struct *vma,
pud_clear(pud);
put_page(virt_to_page(ptep));
mm_dec_nr_pmds(mm);
- /*
- * This update of passed address optimizes loops sequentially
- * processing addresses in increments of huge page size (PMD_SIZE
- * in this case). By clearing the pud, a PUD_SIZE area is unmapped.
- * Update address to the 'last page' in the cleared area so that
- * calling loop can move to first page past this area.
- */
- *addr |= PUD_SIZE - PMD_SIZE;
return 1;
}
@@ -6792,7 +6781,7 @@ pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma,
}
int huge_pmd_unshare(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long *addr, pte_t *ptep)
+ unsigned long addr, pte_t *ptep)
{
return 0;
}
@@ -6899,6 +6888,10 @@ unsigned long hugetlb_mask_last_page(struct hstate *h)
/* See description above. Architectures can provide their own version. */
__weak unsigned long hugetlb_mask_last_page(struct hstate *h)
{
+#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
+ if (huge_page_size(h) == PMD_SIZE)
+ return PUD_SIZE - PMD_SIZE;
+#endif
return 0UL;
}
@@ -7125,14 +7118,11 @@ void hugetlb_unshare_all_pmds(struct vm_area_struct *vma)
mmu_notifier_invalidate_range_start(&range);
i_mmap_lock_write(vma->vm_file->f_mapping);
for (address = start; address < end; address += PUD_SIZE) {
- unsigned long tmp = address;
-
ptep = huge_pte_offset(mm, address, sz);
if (!ptep)
continue;
ptl = huge_pte_lock(h, mm, ptep);
- /* We don't want 'address' to be changed */
- huge_pmd_unshare(mm, vma, &tmp, ptep);
+ huge_pmd_unshare(mm, vma, address, ptep);
spin_unlock(ptl);
}
flush_hugetlb_tlb_range(vma, start, end);