[PATCH 3/4] mm, cma: drain single zone pcplists

[Vlastimil Babka]

CMA allocation drains pcplists so that pages can merge back to buddy allocator.
Since it operates on a single zone, we can reduce the pcplists drain to the
single zone, which is now possible.

The change should make CMA allocations faster and not disturbing unrelated
pcplists anymore.

Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
Cc: Zhang Yanfei <zhangyanfei@xxxxxxxxxxxxxx>
Cc: Xishi Qiu <qiuxishi@xxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@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 bc3db3e..e758159 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6417,7 +6417,7 @@ int alloc_contig_range(unsigned long start, unsigned long end,
 	 */
 
 	lru_add_drain_all();
-	drain_all_pages(NULL);
+	drain_all_pages(cc.zone);
 
 	order = 0;
 	outer_start = start;
-- 
1.8.4.5

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