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authorLiang Chen <liangchen.linux@gmail.com>2016-03-15 14:56:42 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-15 16:55:16 -0700
commit4355c018c2ba8017592520573e76ad376ad656db (patch)
tree7a0922f776f36e6d0cf7cee5c92f438a8e52666e /mm/mempolicy.c
parent0b94f17507dc3a92f091812e5bff890c8845d1a3 (diff)
downloadop-kernel-dev-4355c018c2ba8017592520573e76ad376ad656db.zip
op-kernel-dev-4355c018c2ba8017592520573e76ad376ad656db.tar.gz
mm/mempolicy.c: skip VM_HUGETLB and VM_MIXEDMAP VMA for lazy mbind
VM_HUGETLB and VM_MIXEDMAP vma needs to be excluded to avoid compound pages being marked for migration and unexpected COWs when handling hugetlb fault. Thanks to Naoya Horiguchi for reminding me on these checks. Signed-off-by: Liang Chen <liangchen.linux@gmail.com> Signed-off-by: Gavin Guo <gavin.guo@canonical.com> Suggested-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Acked-by: David Rientjes <rientjes@google.com> Cc: SeongJae Park <sj38.park@gmail.com> Cc: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mempolicy.c')
-rw-r--r--mm/mempolicy.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 9a3f6b9..8cbc743 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -643,7 +643,9 @@ static int queue_pages_test_walk(unsigned long start, unsigned long end,
if (flags & MPOL_MF_LAZY) {
/* Similar to task_numa_work, skip inaccessible VMAs */
- if (vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE))
+ if (!is_vm_hugetlb_page(vma) &&
+ (vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)) &&
+ !(vma->vm_flags & VM_MIXEDMAP))
change_prot_numa(vma, start, endvma);
return 1;
}
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