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    SubjectRe: [PATCH 7/9] mm: delete NR_PAGES_SCANNED and pgdat_reclaimable()
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    On March 01, 2017 5:40 AM Johannes Weiner wrote: 
    >
    > NR_PAGES_SCANNED counts number of pages scanned since the last page
    > free event in the allocator. This was used primarily to measure the
    > reclaimability of zones and nodes, and determine when reclaim should
    > give up on them. In that role, it has been replaced in the preceeding
    > patches by a different mechanism.
    >
    > Being implemented as an efficient vmstat counter, it was automatically
    > exported to userspace as well. It's however unlikely that anyone
    > outside the kernel is using this counter in any meaningful way.
    >
    > Remove the counter and the unused pgdat_reclaimable().
    >
    > Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
    > ---
    Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>


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