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>
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Acked-by: Hillf Danton <redacted>


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