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

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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>
This commit is contained in:
Joonsoo Kim 2016-05-19 17:12:26 -07:00 committed by Linus Torvalds
parent fc2bd799c7
commit 33499bfe50
1 changed files with 4 additions and 8 deletions
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12
mm/highmem.c
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@ -112,16 +112,12 @@ EXPORT_PER_CPU_SYMBOL(__kmap_atomic_idx);
unsigned int nr_free_highpages (void) unsigned int nr_free_highpages (void)
{ {
pg_data_t *pgdat; struct zone *zone;
unsigned int pages = 0; unsigned int pages = 0;
for_each_online_pgdat(pgdat) { for_each_populated_zone(zone) {
pages += zone_page_state(&pgdat->node_zones[ZONE_HIGHMEM], if (is_highmem(zone))
NR_FREE_PAGES); pages += zone_page_state(zone, NR_FREE_PAGES);
if (zone_movable_is_highmem())
pages += zone_page_state(
&pgdat->node_zones[ZONE_MOVABLE],
NR_FREE_PAGES);
} }
return pages; return pages;