Commit 33499bfe authored May 19, 2016 by Joonsoo Kim Committed by Linus Torvalds May 19, 2016

mm/highmem: make nr_free_highpages() handles all highmem zones by itself



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

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>

parent fc2bd799

mm/highmem.c

+4 −8

Original line number	Diff line number	Diff line
		@@ -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;