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    SubjectRe: [PATCH] mm/page_alloc: return 0 in case this node has no page within the zone
    On Mon,  6 Feb 2017 23:43:14 +0800 Wei Yang <richard.weiyang@gmail.com> wrote:

    > The whole memory space is divided into several zones and nodes may have no
    > page in some zones. In this case, the __absent_pages_in_range() would
    > return 0, since the range it is searching for is an empty range.
    >
    > Also this happens more often to those nodes with higher memory range when
    > there are more nodes, which is a trend for future architectures.
    >
    > This patch checks the zone range after clamp and adjustment, return 0 if
    > the range is an empty range.

    What are the user-visible runtime effects of this change?

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