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    SubjectRe: [PATCH 1/4] pagemap: avoid splitting thp when reading /proc/pid/pagemap
    On Wed, 21 Dec 2011 17:23:45 -0500
    Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> wrote:

    > Thp split is not necessary if we explicitly check whether pmds are
    > mapping thps or not. This patch introduces the check and the code
    > to generate pagemap entries for pmds mapping thps, which results in
    > less performance impact of pagemap on thp.
    >
    > Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
    > Reviewed-by: Andi Kleen <ak@linux.intel.com>
    >
    > Changes since v1:
    > - move pfn declaration to the beginning of pagemap_pte_range()
    > ---

    Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>




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