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-rw-r--r--mm/compaction.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/mm/compaction.c b/mm/compaction.c
index 37b3799d948c..212f41c6278b 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -584,6 +584,15 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
continue;
}
+ /*
+ * Migration will fail if an anonymous page is pinned in memory,
+ * so avoid taking lru_lock and isolating it unnecessarily in an
+ * admittedly racy check.
+ */
+ if (!page_mapping(page) &&
+ page_count(page) > page_mapcount(page))
+ continue;
+
/* Check if it is ok to still hold the lock */
locked = compact_checklock_irqsave(&zone->lru_lock, &flags,
locked, cc);