linux-kernel - [PATCH] CMA: use MIGRATE_SYNC in alloc_contig

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Date:	Thu, 29 May 2014 15:25:50 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH] CMA: use MIGRATE_SYNC in alloc_contig_range()

Before commit 'mm, compaction: embed migration mode in compact_control'
from David is merged, alloc_contig_range() used sync migration,
instead of sync_light migration. This doesn't break anything currently
because page isolation doesn't have any difference with sync and
sync_light, but it could in the future, so change back as it was.

And pass cc->mode to migrate_pages(), instead of passing MIGRATE_SYNC
to migrate_pages().

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

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 7f97767..97c4185 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6262,7 +6262,7 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
 		cc->nr_migratepages -= nr_reclaimed;
 
 		ret = migrate_pages(&cc->migratepages, alloc_migrate_target,
-				    NULL, 0, MIGRATE_SYNC, MR_CMA);
+				    NULL, 0, cc->mode, MR_CMA);
 	}
 	if (ret < 0) {
 		putback_movable_pages(&cc->migratepages);
@@ -6301,7 +6301,7 @@ int alloc_contig_range(unsigned long start, unsigned long end,
 		.nr_migratepages = 0,
 		.order = -1,
 		.zone = page_zone(pfn_to_page(start)),
-		.mode = MIGRATE_SYNC_LIGHT,
+		.mode = MIGRATE_SYNC,
 		.ignore_skip_hint = true,
 	};
 	INIT_LIST_HEAD(&cc.migratepages);
-- 
1.7.9.5

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