From: Konstantin Khlebnikov <k.khlebnikov@xxxxxxxxxxx> LRU-lock isn't required for balloon page isolation. This check makes migration of some ballooned pages mostly impossible because isolate_migratepages_range() drops LRU lock periodically. Signed-off-by: Konstantin Khlebnikov <k.khlebnikov@xxxxxxxxxxx> Cc: stable <stable@xxxxxxxxxxxxxxx> # v3.8 --- mm/compaction.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/compaction.c b/mm/compaction.c index 73466e1..ad58f73 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -643,7 +643,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn, */ if (!PageLRU(page)) { if (unlikely(balloon_page_movable(page))) { - if (locked && balloon_page_isolate(page)) { + if (balloon_page_isolate(page)) { /* Successfully isolated */ goto isolate_success; } -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx"> email@xxxxxxxxx </a>