diff options
| -rw-r--r-- | mm/compaction.c | 9 |
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); |