linux-kernel - [RFC 03/16] mm/highmem: make nr_free_highpages() handles all highmem zones by itself

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Date:	Thu, 12 Feb 2015 16:32:07 +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 03/16] mm/highmem: make nr_free_highpages() handles all highmem zones by itself

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

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
---
 mm/highmem.c |   12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/mm/highmem.c b/mm/highmem.c
index 123bcd3..50b4ca6 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -112,16 +112,12 @@ EXPORT_PER_CPU_SYMBOL(__kmap_atomic_idx);
 
 unsigned int nr_free_highpages (void)
 {
-	pg_data_t *pgdat;
+	struct zone *zone;
 	unsigned int pages = 0;
 
-	for_each_online_pgdat(pgdat) {
-		pages += zone_page_state(&pgdat->node_zones[ZONE_HIGHMEM],
-			NR_FREE_PAGES);
-		if (zone_movable_is_highmem())
-			pages += zone_page_state(
-					&pgdat->node_zones[ZONE_MOVABLE],
-					NR_FREE_PAGES);
+	for_each_populated_zone(zone) {
+		if (is_highmem(zone))
+			pages += zone_page_state(zone, NR_FREE_PAGES);
 	}
 
 	return pages;
-- 
1.7.9.5

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