[PATCH] mm: compaction: push isolate search base of compact controlone pfn ahead

[Hillf Danton]

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@xxxxxxxxx>
---

--- a/mm/compaction.c	Thu Nov 24 20:23:28 2011
+++ b/mm/compaction.c	Thu Nov 24 20:32:41 2011
@@ -365,8 +365,10 @@ static isolate_migrate_t isolate_migrate
 		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);
--
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