Re: [RFC PATCH 2/4] mm: use mapcount for identifying zbud pages

[Seth Jennings]

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@xxxxxxxxxxx>

Reviewed-by: Seth Jennings <sjenning@xxxxxxxxxxxxxxxxxx>

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

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