Add clue for ENOMEM hugepage allocation

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/memory.c b/memory.c
index efbea04..46eb852 100644
--- a/memory.c
+++ b/memory.c
@@ -70,6 +70,8 @@
 				log_err("fio: check that you have free huge pages and that hugepage-size is correct.\n");
 			else if (errno == ENOSYS)
 				log_err("fio: your system does not appear to support huge pages.\n");
+			else if (errno == ENOMEM)
+				log_err("fio: no huge pages available, do you need to alocate some? See HOWTO.\n");
 		}
 		
 		return 1;