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    SubjectRe: [RFC PATCH 2/4] mm: use mapcount for identifying zbud pages
    On Fri, Aug 30, 2013 at 10:42:54AM +0200, Krzysztof Kozlowski wrote:
    > Currently zbud pages do not have any flags set so it is not possible to
    > identify them during migration or compaction.
    >
    > Implement PageZbud() by comparing page->_mapcount to -127 to distinguish
    > pages allocated by zbud. Just like PageBuddy() is implemented.
    >
    > Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>

    Reviewed-by: Seth Jennings <sjenning@linux.vnet.ibm.com>

    > ---
    > include/linux/mm.h | 23 +++++++++++++++++++++++
    > mm/zbud.c | 4 ++++
    > 2 files changed, 27 insertions(+)



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