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thp: mincore transparent hugepage support

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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>
This commit is contained in:
Johannes Weiner
2011-01-13 15:47:02 -08:00
committed by Linus Torvalds
parent f2d6bfe9ff
commit 0ca1634d41
3 changed files with 35 additions and 1 deletions
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8
mm/mincore.c
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@@ -154,7 +154,13 @@ static void mincore_pmd_range(struct vm_area_struct *vma, pud_t *pud,
pmd = pmd_offset(pud, addr);
do {
next = pmd_addr_end(addr, end);
split_huge_page_pmd(vma->vm_mm, pmd);
if (pmd_trans_huge(*pmd)) {
if (mincore_huge_pmd(vma, pmd, addr, next, vec)) {
vec += (next - addr) >> PAGE_SHIFT;
continue;
}
/* fall through */
}
if (pmd_none_or_clear_bad(pmd))
mincore_unmapped_range(vma, addr, next, vec);
else