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authorJohannes Weiner <hannes@cmpxchg.org>2011-01-13 15:47:02 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-13 17:32:44 -0800
commit0ca1634d4143c3579273ca53b993df19f5c98e92 (patch)
treed566a582357a9e1528d1783566bfda4375c7e566 /mm/mincore.c
parentf2d6bfe9ff0acec30b713614260e78b03d20e909 (diff)
downloadlinux-0ca1634d4143c3579273ca53b993df19f5c98e92.tar.gz
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>
Diffstat (limited to 'mm/mincore.c')
-rw-r--r--mm/mincore.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/mm/mincore.c b/mm/mincore.c
index 9959bb41570..a4e6b9d75c7 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -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