linux-kernel - [PATCH 3.12 116/144] mm/compaction: respect ignore_skip_hint in update_pageblock

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Date:	Mon,  6 Jan 2014 14:37:57 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Joonsoo Kim <iamjoonsoo.kim@....com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	Rafael Aquini <aquini@...hat.com>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 3.12 116/144] mm/compaction: respect ignore_skip_hint in update_pageblock_skip

3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Joonsoo Kim <iamjoonsoo.kim@....com>

commit 6815bf3f233e0b10c99a758497d5d236063b010b upstream.

update_pageblock_skip() only fits to compaction which tries to isolate
by pageblock unit.  If isolate_migratepages_range() is called by CMA, it
try to isolate regardless of pageblock unit and it don't reference
get_pageblock_skip() by ignore_skip_hint.  We should also respect it on
update_pageblock_skip() to prevent from setting the wrong information.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
Acked-by: Vlastimil Babka <vbabka@...e.cz>
Reviewed-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Reviewed-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Cc: Christoph Lameter <cl@...ux.com>
Cc: Rafael Aquini <aquini@...hat.com>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Rik van Riel <riel@...hat.com>
Cc: Zhang Yanfei <zhangyanfei@...fujitsu.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 mm/compaction.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -134,6 +134,10 @@ static void update_pageblock_skip(struct
 			bool migrate_scanner)
 {
 	struct zone *zone = cc->zone;
+
+	if (cc->ignore_skip_hint)
+		return;
+
 	if (!page)
 		return;
 


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