From: Hillf Danton <dhillf@gmail.com>
Date: Tue, 10 Jan 2012 23:07:59 +0000 (-0800)
Subject: mm: compaction: push isolate search base of compact control one pfn ahead
X-Git-Tag: v3.3-rc1~113^2~97
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=31b8384a555d94c78e2ea2284a323cb985441f60;p=platform%2Fkernel%2Flinux-exynos.git

mm: compaction: push isolate search base of compact control one pfn ahead

After isolated the current pfn will no longer be scanned and isolated if
the next round is necessary, so push the isolate_migratepages search base
of the given compact_control one step ahead.

Signed-off-by: Hillf Danton <dhillf@gmail.com>
Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/compaction.c b/mm/compaction.c
index 1253d7a..e6670c34 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -365,8 +365,10 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
 		nr_isolated++;
 
 		/* Avoid isolating too much */
-		if (cc->nr_migratepages == COMPACT_CLUSTER_MAX)
+		if (cc->nr_migratepages == COMPACT_CLUSTER_MAX) {
+			++low_pfn;
 			break;
+		}
 	}
 
 	acct_isolated(zone, cc);