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

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Message-ID: <20121004140017.GW29125@suse.de>
Date:	Thu, 4 Oct 2012 15:00:17 +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() -fix1

The following patch is still missing from linux-next/akpm so am
resending in case it got lost in the mess.


CMA is reported to be broken in next-20120926. Minchan Kim pointed out
that this was due to nr_scanned != total_isolated in the case of CMA
because PageBuddy pages are one scan but many isolations in CMA. This
patch should address the problem.

This patch is a fix for
mm-compaction-acquire-the-zone-lock-as-late-as-possible-fix-2.patch

Signed-off-by: Mel Gorman <mgorman@...e.de>

diff --git a/mm/compaction.c b/mm/compaction.c
index 136debd..ed3b8f1 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -282,6 +282,7 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
 {
 	int nr_scanned = 0, total_isolated = 0;
 	struct page *cursor, *valid_page = NULL;
+	unsigned long nr_strict_required = end_pfn - blockpfn;
 	unsigned long flags;
 	bool locked = false;
 
@@ -342,10 +343,10 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
 
 	/*
 	 * If strict isolation is requested by CMA then check that all the
-	 * pages scanned were isolated. If there were any failures, 0 is
+	 * pages requested were isolated. If there were any failures, 0 is
 	 * returned and CMA will fail.
 	 */
-	if (strict && nr_scanned != total_isolated)
+	if (strict && nr_strict_required != total_isolated)
 		total_isolated = 0;
 
 	if (locked)
--
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