mm, cma: drain single zone pcplists

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 <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Yasuaki Ishimatsu <[email protected]>
Cc: Zhang Yanfei <[email protected]>
Cc: Xishi Qiu <[email protected]>
Cc: Vladimir Davydov <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Michal Nazarewicz <[email protected]>
Cc: Marek Szyprowski <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 13d5796de8f346aab5bf419db3da4143a3cfb559..f3a6bf12cbc11a3d2d2cbbbd57043efd92040767 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6416,7 +6416,7 @@ 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;