The patch titled
Subject: mm/mempolicy.c: skip VM_HUGETLB and VM_MIXEDMAP VMA for lazy mbind
has been added to the -mm tree. Its filename is
mm-mempolicy-skip-vm_hugetlb-and-vm_mixedmap-vma-for-lazy-mbind.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-mempolicy-skip-vm_hugetlb-and-vm_mixedmap-vma-for-lazy-mbind.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-mempolicy-skip-vm_hugetlb-and-vm_mixedmap-vma-for-lazy-mbind.patch
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------------------------------------------------------
From: Liang Chen <liangchen.linux@xxxxxxxxx>
Subject: 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@xxxxxxxxx>
Signed-off-by: Gavin Guo <gavin.guo@xxxxxxxxxxxxx>
Suggested-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Cc: SeongJae Park <sj38.park@xxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mempolicy.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff -puN mm/mempolicy.c~mm-mempolicy-skip-vm_hugetlb-and-vm_mixedmap-vma-for-lazy-mbind mm/mempolicy.c
--- a/mm/mempolicy.c~mm-mempolicy-skip-vm_hugetlb-and-vm_mixedmap-vma-for-lazy-mbind
+++ a/mm/mempolicy.c
@@ -644,8 +644,9 @@ static int queue_pages_test_walk(unsigne
if (flags & MPOL_MF_LAZY) {
/* Similar to task_numa_work, skip inaccessible VMAs */
- if (vma_migratable(vma) &&
- vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE))
+ if (vma_migratable(vma) && !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;
}
_
Patches currently in -mm which might be from liangchen.linux@xxxxxxxxx are
mm-mempolicy-skip-vm_hugetlb-and-vm_mixedmap-vma-for-lazy-mbind.patch
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