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    Subject[PATCH 09/63] mm: Account for a THP NUMA hinting update as one PTE update
    Date
    A THP PMD update is accounted for as 512 pages updated in vmstat.  This is
    large difference when estimating the cost of automatic NUMA balancing and
    can be misleading when comparing results that had collapsed versus split
    THP. This patch addresses the accounting issue.

    Cc: stable <stable@vger.kernel.org>
    Signed-off-by: Mel Gorman <mgorman@suse.de>
    ---
    mm/mprotect.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/mm/mprotect.c b/mm/mprotect.c
    index 94722a4..2bbb648 100644
    --- a/mm/mprotect.c
    +++ b/mm/mprotect.c
    @@ -145,7 +145,7 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
    split_huge_page_pmd(vma, addr, pmd);
    else if (change_huge_pmd(vma, pmd, addr, newprot,
    prot_numa)) {
    - pages += HPAGE_PMD_NR;
    + pages++;
    continue;
    }
    /* fall through */
    --
    1.8.4


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