mm: show node_pages_scanned per node, not zone

The node_pages_scanned represents the number of scanned pages of node
for reclaim so it's pointless to show it as kilobytes.

As well, node_pages_scanned is per-node value, not per-zone.

This patch changes node_pages_scanned per-zone-killobytes with
per-node-count.

[minchan@kernel.org: fix node_pages_scanned]
  Link: http://lkml.kernel.org/r/20160716101431.GA10305@bbox
Link: http://lkml.kernel.org/r/1468588165-12461-5-git-send-email-mgorman@techsingularity.net
Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f1b5a0bc11f2..ffd4fdbae8b5 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4313,6 +4313,7 @@ void show_free_areas(unsigned int filter)
 #endif
                         " writeback_tmp:%lukB"
                         " unstable:%lukB"
+                        " pages_scanned:%lu"
                         " all_unreclaimable? %s"
                         "\n",
                         pgdat->node_id,
@@ -4335,6 +4336,7 @@ void show_free_areas(unsigned int filter)
                         K(node_page_state(pgdat, NR_SHMEM)),
                         K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
                         K(node_page_state(pgdat, NR_UNSTABLE_NFS)),
+                        node_page_state(pgdat, NR_PAGES_SCANNED),
                         !pgdat_reclaimable(pgdat) ? "yes" : "no");
         }
 
@@ -4365,7 +4367,6 @@ void show_free_areas(unsigned int filter)
                         " free_pcp:%lukB"
                         " local_pcp:%ukB"
                         " free_cma:%lukB"
-                        " node_pages_scanned:%lu"
                         "\n",
                         zone->name,
                         K(zone_page_state(zone, NR_FREE_PAGES)),
@@ -4383,8 +4384,7 @@ void show_free_areas(unsigned int filter)
                         K(zone_page_state(zone, NR_BOUNCE)),
                         K(free_pcp),
                         K(this_cpu_read(zone->pageset->pcp.count)),
-                        K(zone_page_state(zone, NR_FREE_CMA_PAGES)),
-                        K(node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED)));
+                        K(zone_page_state(zone, NR_FREE_CMA_PAGES)));
                 printk("lowmem_reserve[]:");
                 for (i = 0; i < MAX_NR_ZONES; i++)
                         printk(" %ld", zone->lowmem_reserve[i]);