linux-kernel - [PATCH] mm: migrate: Check page_count of THP before migrating accounting fix

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Date:	Wed, 9 Jan 2013 12:04:47 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Hugh Dickins <hughd@...gle.com>, Ingo Molnar <mingo@...nel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH] mm: migrate: Check page_count of THP before migrating
 accounting fix

As pointed out by Hugh Dickins, "mm: migrate: Check page_count of THP
before migrating" can leave nr_isolated_anon elevated, correct it. This
is a fix to mm-migrate-check-page_count-of-thp-before-migrating.patch

Signed-off-by: Mel Gorman <mgorman@...e.de>
---
 mm/migrate.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index f466827..c387786 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1689,8 +1689,11 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
 	if (!isolated || page_count(page) != 2) {
 		count_vm_events(PGMIGRATE_FAIL, HPAGE_PMD_NR);
 		put_page(new_page);
-		if (isolated)
+		if (isolated) {
 			putback_lru_page(page);
+			isolated = 0;
+			goto out;
+		}
 		goto out_keep_locked;
 	}
 
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