linux-kernel - [PATCH] mm: compaction: Iron out isolate_freepages_block() and isolate_freepages

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Message-ID: <20121005095945.GC29125@suse.de>
Date:	Fri, 5 Oct 2012 10:59:45 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Minchan Kim <minchan@...nel.org>,
	Thierry Reding <thierry.reding@...onic-design.de>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Peter Ujfalusi <peter.ujfalusi@...com>
Subject: [PATCH] mm: compaction: Iron out isolate_freepages_block() and
 isolate_freepages_range() -fix2

Thierry reported offline that the strict check "mm: compaction: Iron out
isolate_freepages_block() and isolate_freepages_range() -fix1" check is
still too strict because it's possible for more pages to be isolated
than required. This patch corrects the check.

There are still CMA-related problems but they are "somewhere else" yet
to be determined.

Signed-off-by: Mel Gorman <mgorman@...e.de>
---
 mm/compaction.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index 2c4ce17..9eef558 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -346,7 +346,7 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
 	 * pages requested were isolated. If there were any failures, 0 is
 	 * returned and CMA will fail.
 	 */
-	if (strict && nr_strict_required != total_isolated)
+	if (strict && nr_strict_required > total_isolated)
 		total_isolated = 0;
 
 	if (locked)
--
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