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authorDoug Doan <dougd@cray.com>2010-08-10 00:18:30 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-10 03:44:54 (GMT)
commit3edd4fc9537d95e460d502987c63a90d6b9a7a82 (patch)
treefe0563459b9d6104dcc7f7ab6f8945e815f09665 /mm/hugetlb.c
parenta1b200e27c0426ea98c1231a2b78c6094eb073e4 (diff)
hugetlb: call mmu notifiers on hugepage cow
When a copy-on-write occurs, we take one of two paths in handle_mm_fault: through handle_pte_fault for normal pages, or through hugetlb_fault for huge pages. In the normal page case, we eventually get to do_wp_page and call mmu notifiers via ptep_clear_flush_notify. There is no callout to the mmmu notifiers in the huge page case. This patch fixes that. Signed-off-by: Doug Doan <dougd@cray.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Cc: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/hugetlb.c')
-rw-r--r--mm/hugetlb.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 54d42b0..b61d2db 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2349,11 +2349,17 @@ retry_avoidcopy:
ptep = huge_pte_offset(mm, address & huge_page_mask(h));
if (likely(pte_same(huge_ptep_get(ptep), pte))) {
/* Break COW */
+ mmu_notifier_invalidate_range_start(mm,
+ address & huge_page_mask(h),
+ (address & huge_page_mask(h)) + huge_page_size(h));
huge_ptep_clear_flush(vma, address, ptep);
set_huge_pte_at(mm, address, ptep,
make_huge_pte(vma, new_page, 1));
/* Make the old page be freed below */
new_page = old_page;
+ mmu_notifier_invalidate_range_end(mm,
+ address & huge_page_mask(h),
+ (address & huge_page_mask(h)) + huge_page_size(h));
}
page_cache_release(new_page);
page_cache_release(old_page);

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