On Tue, 24 Nov 2015, Michal Hocko wrote:
> From: Michal Hocko <mhocko@xxxxxxxx>
>
> zone_reclaimable_pages counts how many pages are reclaimable in
> the given zone. This currently includes all pages on file lrus and
> anon lrus if there is an available swap storage. We do not consider
> NR_ISOLATED_{ANON,FILE} counters though which is not correct because
> these counters reflect temporarily isolated pages which are still
> reclaimable because they either get back to their LRU or get freed
> either by the page reclaim or page migration.
>
> The number of these pages might be sufficiently high to confuse users of
> zone_reclaimable_pages (e.g. mbind can migrate large ranges of memory at
> once).
>
> Suggested-by: Johannes Weiner <hannes@xxxxxxxxxxx>
> Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
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