[PATCH 69/97] mm: page_alloc: do not treat a zone that cannot be used for dirty pages as "full"

From: Mel Gorman
Date: Thu Aug 28 2014 - 14:51:15 EST

commit 800a1e750c7b04c2aa2459afca77e936e01c0029 upstream.

If a zone cannot be used for a dirty page then it gets marked "full" which
is cached in the zlc and later potentially skipped by allocation requests
that have nothing to do with dirty zones.

Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
mm/page_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 2834c31..68e0349 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1966,7 +1966,7 @@ zonelist_scan:
if ((alloc_flags & ALLOC_WMARK_LOW) &&
(gfp_mask & __GFP_WRITE) && !zone_dirty_ok(zone))
- goto this_zone_full;
+ continue;

mark = zone->watermark[alloc_flags & ALLOC_WMARK_MASK];
if (!zone_watermark_ok(zone, order, mark,

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