linux-kernel - [PATCH 02/17] mm: page_alloc: Do not treat a zone that cannot be used for dirty pages as "full"

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Message-Id: <1398933888-4940-3-git-send-email-mgorman@suse.de>
Date:	Thu,  1 May 2014 09:44:33 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Linux-MM <linux-mm@...ck.org>,
	Linux-FSDevel <linux-fsdevel@...r.kernel.org>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Vlastimil Babka <vbabka@...e.cz>, Jan Kara <jack@...e.cz>,
	Michal Hocko <mhocko@...e.cz>, Hugh Dickins <hughd@...gle.com>,
	Mel Gorman <mgorman@...e.de>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH 02/17] 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@...e.de>
Acked-by: Johannes Weiner <hannes@...xchg.org>
---
 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 f8b80c3..5c559e3 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1976,7 +1976,7 @@ 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,
-- 
1.8.4.5

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