linux-kernel - [PATCH 2/7] mm/cma: fix cma free page accounting

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Message-Id: <1389251087-10224-3-git-send-email-iamjoonsoo.kim@lge.com>
Date:	Thu,  9 Jan 2014 16:04:42 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>,
	Jiang Liu <jiang.liu@...wei.com>, Mel Gorman <mgorman@...e.de>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Minchan Kim <minchan@...nel.org>,
	Michal Nazarewicz <mina86@...a86.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>,
	Tang Chen <tangchen@...fujitsu.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Joonsoo Kim <js1304@...il.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH 2/7] mm/cma: fix cma free page accounting

Cma pages can be allocated by not only order 0 request but also high order
request. So, we should consider to account free cma page in the both
places.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index b36aa5a..1489c301 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1091,6 +1091,12 @@ __rmqueue_fallback(struct zone *zone, int order, int start_migratetype)
 							  start_migratetype,
 							  migratetype);
 
+			/* CMA pages cannot be stolen */
+			if (is_migrate_cma(migratetype)) {
+				__mod_zone_page_state(zone,
+					NR_FREE_CMA_PAGES, -(1 << order));
+			}
+
 			/* Remove the page from the freelists */
 			list_del(&page->lru);
 			rmv_page_order(page);
@@ -1175,9 +1181,6 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order,
 		}
 		set_freepage_migratetype(page, mt);
 		list = &page->lru;
-		if (is_migrate_cma(mt))
-			__mod_zone_page_state(zone, NR_FREE_CMA_PAGES,
-					      -(1 << order));
 	}
 	__mod_zone_page_state(zone, NR_FREE_PAGES, -(i << order));
 	spin_unlock(&zone->lock);
-- 
1.7.9.5

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