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Commit 09b4ab3c authored by Joonsoo Kim's avatar Joonsoo Kim Committed by Linus Torvalds
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mm/writeback: correct dirty page calculation for highmem 



ZONE_MOVABLE could be treated as highmem so we need to consider it for
accurate calculation of dirty pages.  And, in following patches,
ZONE_CMA will be introduced and it can be treated as highmem, too.  So,
instead of manually adding stat of ZONE_MOVABLE, looping all zones and
check whether the zone is highmem or not and add stat of the zone which
can be treated as highmem.

Signed-off-by: default avatarJoonsoo Kim <iamjoonsoo.kim@lge.com>
Reviewed-by: default avatarAneesh 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@suse.de>
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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ba6b0979

mm/page-writeback.c

+6 −2
Original line number Diff line number Diff line
@@ -296,12 +296,16 @@ static unsigned long highmem_dirtyable_memory(unsigned long total) 
#ifdef CONFIG_HIGHMEM

	int node;

	unsigned long x = 0;

	int i;



	for_each_node_state(node, N_HIGH_MEMORY) {

		struct zone *z = &NODE_DATA(node)->node_zones[ZONE_HIGHMEM];

		for (i = 0; i < MAX_NR_ZONES; i++) {

			struct zone *z = &NODE_DATA(node)->node_zones[i];



			if (is_highmem(z))

				x += zone_dirtyable_memory(z);

		}

	}

	/*

	 * Unreclaimable memory (kernel memory or anonymous memory

	 * without swap) can bring down the dirtyable pages below