mm, vmscan: make shrink_node decisions more node-centric

Earlier patches focused on having direct reclaim and kswapd use data
that is node-centric for reclaiming but shrink_node() itself still uses
too much zone information.  This patch removes unnecessary zone-based
information with the most important decision being whether to continue
reclaim or not.  Some memcg APIs are adjusted as a result even though
memcg itself still uses some zone information.

[mgorman@techsingularity.net: optimization]
  Link: http://lkml.kernel.org/r/1468588165-12461-2-git-send-email-mgorman@techsingularity.net
Link: http://lkml.kernel.org/r/1467970510-21195-14-git-send-email-mgorman@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Rik van Riel <riel@surriel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 81586410c59c..749b3c358ead 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5911,6 +5911,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
 #endif
         pgdat_page_ext_init(pgdat);
         spin_lock_init(&pgdat->lru_lock);
+        lruvec_init(node_lruvec(pgdat));
 
         for (j = 0; j < MAX_NR_ZONES; j++) {
                 struct zone *zone = pgdat->node_zones + j;
@@ -5973,7 +5974,6 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
                 /* For bootup, initialized properly in watermark setup */
                 mod_zone_page_state(zone, NR_ALLOC_BATCH, zone->managed_pages);
 
-                lruvec_init(zone_lruvec(zone));
                 if (!size)
                         continue;