Subject: use compaction for all allocation orders

From: Andrea Arcangeli <aarcange@redhat.com>

It makes no sense not to enable compaction for small order pages as we don't
want to end up with bad order 2 allocations and good and graceful order 9
allocations.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
---

diff --git a/mm/compaction.c b/mm/compaction.c
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -579,7 +579,7 @@ unsigned long try_to_compact_pages(struc
 	 * made because an assumption is made that the page allocator can satisfy
 	 * the "cheaper" orders without taking special steps
 	 */
-	if (order <= PAGE_ALLOC_COSTLY_ORDER || !may_enter_fs || !may_perform_io)
+	if (!order || !may_enter_fs || !may_perform_io)
 		return rc;
 
 	count_vm_event(COMPACTSTALL);