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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: 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@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: 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 17:12:20 -07:00 committed by Linus Torvalds
parent ba6b0979e3
commit 09b4ab3c43
1 changed files with 6 additions and 2 deletions
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8
mm/page-writeback.c
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@ -296,11 +296,15 @@ 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];
x += zone_dirtyable_memory(z);
if (is_highmem(z))
x += zone_dirtyable_memory(z);
}
}
/*
* Unreclaimable memory (kernel memory or anonymous memory