linux-kernel - [RFC 04/16] mm/vmstat: make node_page_state() handles all zones by itself

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Date:	Thu, 12 Feb 2015 16:32:08 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mgorman@...e.de>,
	Laura Abbott <lauraa@...eaurora.org>,
	Minchan Kim <minchan@...nel.org>,
	Heesub Shin <heesub.shin@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Hui Zhu <zhuhui@...omi.com>, Gioh Kim <gioh.kim@....com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Ritesh Harjani <ritesh.list@...il.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [RFC 04/16] mm/vmstat: make node_page_state() handles all zones by itself

node_page_state() manually add statistics per each zone and return
total value for all zones. Whenever we add a new zone, we need to
consider this function and it's really troublesome. Make it handles
all zones by itself.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
---
 include/linux/vmstat.h |   18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index 82e7db7..676488a 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -170,19 +170,13 @@ static inline unsigned long node_page_state(int node,
 				 enum zone_stat_item item)
 {
 	struct zone *zones = NODE_DATA(node)->node_zones;
+	int i;
+	unsigned long count = 0;
 
-	return
-#ifdef CONFIG_ZONE_DMA
-		zone_page_state(&zones[ZONE_DMA], item) +
-#endif
-#ifdef CONFIG_ZONE_DMA32
-		zone_page_state(&zones[ZONE_DMA32], item) +
-#endif
-#ifdef CONFIG_HIGHMEM
-		zone_page_state(&zones[ZONE_HIGHMEM], item) +
-#endif
-		zone_page_state(&zones[ZONE_NORMAL], item) +
-		zone_page_state(&zones[ZONE_MOVABLE], item);
+	for (i = 0; i < MAX_NR_ZONES; i++)
+		count += zone_page_state(zones + i, item);
+
+	return count;
 }
 
 extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp);
-- 
1.7.9.5

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