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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 <[email protected]>
Reviewed-by: Aneesh Kumar K.V <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Laura Abbott <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Marek Szyprowski <[email protected]>
Cc: Michal Nazarewicz <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Joonsoo Kim 2016-05-19 17:12:26 -07:00 • committed by Linus Torvalds
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)
{
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;