mm, vmscan: consider isolated pages in zone_reclaimable_pages

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).

Signed-off-by: Michal Hocko <[email protected]>
Suggested-by: Johannes Weiner <[email protected]>
Acked-by: Johannes Weiner <[email protected]>
Reviewed-by: Vladimir Davydov <[email protected]>
Acked-by: David Rientjes <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Mel Gorman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions