linux-kernel - [PATCH] mm: compaction: cache if a pageblock was scanned and no pages were isolated -fix2

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Date:	Thu, 27 Sep 2012 13:06:21 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Richard Davies <richard@...chsys.com>,
	Shaohua Li <shli@...nel.org>, Rik van Riel <riel@...hat.com>,
	Avi Kivity <avi@...hat.com>,
	QEMU-devel <qemu-devel@...gnu.org>, KVM <kvm@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] mm: compaction: cache if a pageblock was scanned and no
 pages were isolated -fix2

The clearing of PG_migrate_skip potentially takes a long time if the
zone is massive. Be safe and check if it needs to reschedule.

This is a fix for
mm-compaction-cache-if-a-pageblock-was-scanned-and-no-pages-were-isolated.patch

Signed-off-by: Mel Gorman <mgorman@...e.de>
---
 mm/compaction.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/compaction.c b/mm/compaction.c
index fb07abb..722d10f 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -85,6 +85,9 @@ static void reset_isolation_suitable(struct zone *zone)
 	/* Walk the zone and mark every pageblock as suitable for isolation */
 	for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) {
 		struct page *page;
+
+		cond_resched();
+
 		if (!pfn_valid(pfn))
 			continue;
 
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