mm: page_alloc: do not treat a zone that cannot be used for dirty pages as "full"

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@suse.de>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8e766241cf56..b4381eaee715 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1967,7 +1967,7 @@ 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,