linux-kernel - [PATCH] mm: cma: free cma page to buddy instead of being cpu hot page

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Date:	Mon, 28 Oct 2013 19:42:49 +0800
From:	zhang.mingjun@...aro.org
To:	minchan@...nel.org, m.szyprowski@...sung.com,
	akpm@...ux-foundation.org, mgorman@...e.de,
	haojian.zhuang@...aro.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc:	Mingjun Zhang <troy.zhangmingjun@...aro.org>
Subject: [PATCH] mm: cma: free cma page to buddy instead of being cpu hot  page

From: Mingjun Zhang <troy.zhangmingjun@...aro.org>

free_contig_range frees cma pages one by one and MIGRATE_CMA pages will be
used as MIGRATE_MOVEABLE pages in the pcp list, it causes unnecessary
migration action when these pages reused by CMA.

Signed-off-by: Mingjun Zhang <troy.zhangmingjun@...aro.org>
---
 mm/page_alloc.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0ee638f..84b9d84 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1362,7 +1362,8 @@ void free_hot_cold_page(struct page *page, int cold)
 	 * excessively into the page allocator
 	 */
 	if (migratetype >= MIGRATE_PCPTYPES) {
-		if (unlikely(is_migrate_isolate(migratetype))) {
+		if (unlikely(is_migrate_isolate(migratetype))
+			|| is_migrate_cma(migratetype))
 			free_one_page(zone, page, 0, migratetype);
 			goto out;
 		}
-- 
1.7.9.5

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