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thp: mincore transparent hugepage support
Handle transparent huge page pmd entries natively instead of splitting them into subpages. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Reviewed-by: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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3 changed files with 35 additions and 1 deletions
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@ -19,6 +19,9 @@ extern struct page *follow_trans_huge_pmd(struct mm_struct *mm,
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extern int zap_huge_pmd(struct mmu_gather *tlb,
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struct vm_area_struct *vma,
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pmd_t *pmd);
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extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
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unsigned long addr, unsigned long end,
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unsigned char *vec);
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enum transparent_hugepage_flag {
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TRANSPARENT_HUGEPAGE_FLAG,
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@ -923,6 +923,31 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
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return ret;
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}
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int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
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unsigned long addr, unsigned long end,
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unsigned char *vec)
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{
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int ret = 0;
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spin_lock(&vma->vm_mm->page_table_lock);
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if (likely(pmd_trans_huge(*pmd))) {
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ret = !pmd_trans_splitting(*pmd);
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spin_unlock(&vma->vm_mm->page_table_lock);
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if (unlikely(!ret))
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wait_split_huge_page(vma->anon_vma, pmd);
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else {
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/*
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* All logical pages in the range are present
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* if backed by a huge page.
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*/
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memset(vec, 1, (end - addr) >> PAGE_SHIFT);
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}
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} else
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spin_unlock(&vma->vm_mm->page_table_lock);
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return ret;
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}
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pmd_t *page_check_address_pmd(struct page *page,
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struct mm_struct *mm,
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unsigned long address,
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@ -154,7 +154,13 @@ static void mincore_pmd_range(struct vm_area_struct *vma, pud_t *pud,
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pmd = pmd_offset(pud, addr);
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do {
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next = pmd_addr_end(addr, end);
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split_huge_page_pmd(vma->vm_mm, pmd);
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if (pmd_trans_huge(*pmd)) {
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if (mincore_huge_pmd(vma, pmd, addr, next, vec)) {
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vec += (next - addr) >> PAGE_SHIFT;
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continue;
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}
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/* fall through */
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}
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if (pmd_none_or_clear_bad(pmd))
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mincore_unmapped_range(vma, addr, next, vec);
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else
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