mm/page_alloc: correct highmem memory statistics

ZONE_MOVABLE could be treated as highmem so we need to consider it for
accurate statistics.  And, in following patches, ZONE_CMA will be
introduced and it can be treated as highmem, too.  So, instead of
manually adding stat of ZONE_MOVABLE, looping all zones and check
whether the zone is highmem or not and add stat of the zone which can be
treated as highmem.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Laura Abbott <lauraa@codeaurora.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Michal Nazarewicz <mina86@mina86.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 14 insertions, 5 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e132705d19fd..da6d339f1936 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3793,6 +3793,8 @@ void si_meminfo_node(struct sysinfo *val, int nid)
 {
         int zone_type;          /* needs to be signed */
         unsigned long managed_pages = 0;
+        unsigned long managed_highpages = 0;
+        unsigned long free_highpages = 0;
         pg_data_t *pgdat = NODE_DATA(nid);
 
         for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++)
@@ -3801,12 +3803,19 @@ void si_meminfo_node(struct sysinfo *val, int nid)
         val->sharedram = node_page_state(nid, NR_SHMEM);
         val->freeram = node_page_state(nid, NR_FREE_PAGES);
 #ifdef CONFIG_HIGHMEM
-        val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].managed_pages;
-        val->freehigh = zone_page_state(&pgdat->node_zones[ZONE_HIGHMEM],
-                        NR_FREE_PAGES);
+        for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) {
+                struct zone *zone = &pgdat->node_zones[zone_type];
+
+                if (is_highmem(zone)) {
+                        managed_highpages += zone->managed_pages;
+                        free_highpages += zone_page_state(zone, NR_FREE_PAGES);
+                }
+        }
+        val->totalhigh = managed_highpages;
+        val->freehigh = free_highpages;
 #else
-        val->totalhigh = 0;
-        val->freehigh = 0;
+        val->totalhigh = managed_highpages;
+        val->freehigh = free_highpages;
 #endif
         val->mem_unit = PAGE_SIZE;
 }