The patch titled
Subject: mm: thp: split_huge_pmd_address() comment improvement
has been added to the -mm tree. Its filename is
mm-thp-split_huge_pmd_address-comment-improvement.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-thp-split_huge_pmd_address-comment-improvement.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-thp-split_huge_pmd_address-comment-improvement.patch
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------------------------------------------------------
From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Subject: mm: thp: split_huge_pmd_address() comment improvement
Comment is partly wrong, this improves it by including the case of
split_huge_pmd_address() called by try_to_unmap_one if TTU_SPLIT_HUGE_PMD
is set.
Link: http://lkml.kernel.org/r/1462547040-1737-4-git-send-email-aarcange@xxxxxxxxxx
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Alex Williamson <alex.williamson@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff -puN mm/huge_memory.c~mm-thp-split_huge_pmd_address-comment-improvement mm/huge_memory.c
--- a/mm/huge_memory.c~mm-thp-split_huge_pmd_address-comment-improvement
+++ a/mm/huge_memory.c
@@ -3023,8 +3023,10 @@ void split_huge_pmd_address(struct vm_ar
return;
/*
- * Caller holds the mmap_sem write mode, so a huge pmd cannot
- * materialize from under us.
+ * Caller holds the mmap_sem write mode or the anon_vma lock,
+ * so a huge pmd cannot materialize from under us (khugepaged
+ * holds both the mmap_sem write mode and the anon_vma lock
+ * write mode).
*/
__split_huge_pmd(vma, pmd, address, freeze);
}
_
Patches currently in -mm which might be from aarcange@xxxxxxxxxx are
mm-thp-calculate-the-mapcount-correctly-for-thp-pages-during-wp-faults.patch
mm-thp-microoptimize-compound_mapcount.patch
mm-thp-split_huge_pmd_address-comment-improvement.patch
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