linux-kernel - [PATCH 07/18] mm: numa: Avoid unnecessary work on the failure path

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Message-Id: <1386690695-27380-8-git-send-email-mgorman@suse.de>
Date:	Tue, 10 Dec 2013 15:51:25 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Alex Thorlton <athorlton@....com>, Rik van Riel <riel@...hat.com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>, Mel Gorman <mgorman@...e.de>
Subject: [PATCH 07/18] mm: numa: Avoid unnecessary work on the failure path

If a PMD changes during a THP migration then migration aborts but the
failure path is doing more work than is necessary.

Cc: stable@...r.kernel.org
Signed-off-by: Mel Gorman <mgorman@...e.de>
Reviewed-by: Rik van Riel <riel@...hat.com>
---
 mm/migrate.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index be787d5..a987525 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1780,7 +1780,8 @@ fail_putback:
 		putback_lru_page(page);
 		mod_zone_page_state(page_zone(page),
 			 NR_ISOLATED_ANON + page_lru, -HPAGE_PMD_NR);
-		goto out_fail;
+
+		goto out_unlock;
 	}
 
 	/*
@@ -1854,6 +1855,7 @@ out_dropref:
 	}
 	spin_unlock(ptl);
 
+out_unlock:
 	unlock_page(page);
 	put_page(page);
 	return 0;
-- 
1.8.4

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