Subject: don't alloc harder for gfp nomemalloc even if nowait

From: Andrea Arcangeli <aarcange@redhat.com>

Not worth throwing away the precious reserved free memory pool for allocations
that can fail gracefully (either through mempool or because they're transhuge
allocations later falling back to 4k allocations).

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
---

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1788,7 +1788,11 @@ gfp_to_alloc_flags(gfp_t gfp_mask)
 	 */
 	alloc_flags |= (gfp_mask & __GFP_HIGH);
 
-	if (!wait) {
+	/*
+	 * Not worth trying to allocate harder for __GFP_NOMEMALLOC
+	 * even if it can't schedule.
+	 */
+	if (!wait && !(gfp_mask & __GFP_NOMEMALLOC)) {
 		alloc_flags |= ALLOC_HARDER;
 		/*
 		 * Ignore cpuset if GFP_ATOMIC (!wait) rather than fail alloc.