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Subject[PATCH 10/15] mm: numa: Avoid unnecessary work on the failure path
Date
If a PMD changes during a THP migration then migration aborts but the
failure path is doing more work than is necessary.

Signed-off-by: Mel Gorman <mgorman@suse.de>
---
mm/migrate.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 3a87511..e429206 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1774,7 +1774,8 @@ 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;
}

/*
@@ -1848,6 +1849,7 @@ out_dropref:
}
spin_unlock(&mm->page_table_lock);

+out_unlock:
unlock_page(page);
put_page(page);
return 0;
--
1.8.4


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