linux-kernel - [PATCH] mm: compaction: push isolate search base of compact control one pfn ahead

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Message-ID: <CAJd=RBCJwyo3dQAYmE3oXBBDMDa5GkePfQ_Sct_YUt5=_1-ovw@mail.gmail.com>
Date:	Thu, 24 Nov 2011 20:38:14 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] 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@...il.com>
---

--- 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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