thp: use compaction for all allocation orders

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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/compaction.c b/mm/compaction.c
index 60d52a7..6d592a0 100644 (file)
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -578,7 +578,7 @@ unsigned long try_to_compact_pages(struct zonelist *zonelist,
         * 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);