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

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Message-Id: <1412264940-15738-4-git-send-email-vbabka@suse.cz>
Date:	Thu,  2 Oct 2014 17:48:59 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Vlastimil Babka <vbabka@...e.cz>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	Xishi Qiu <qiuxishi@...wei.com>,
	Vladimir Davydov <vdavydov@...allels.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH 3/4] 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 <vbabka@...e.cz>
Cc: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Rik van Riel <riel@...hat.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Cc: Zhang Yanfei <zhangyanfei@...fujitsu.com>
Cc: Xishi Qiu <qiuxishi@...wei.com>
Cc: Vladimir Davydov <vdavydov@...allels.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
---
 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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