Index: sys/vm/swap_pager.c
===================================================================
--- sys/vm/swap_pager.c	(revision 238711)
+++ sys/vm/swap_pager.c	(working copy)
@@ -1804,6 +1804,7 @@
 static void
 swp_pager_meta_build(vm_object_t object, vm_pindex_t pindex, daddr_t swapblk)
 {
+	static volatile int exhausted;
 	struct swblock *swap;
 	struct swblock **pswap;
 	int idx;
@@ -1847,7 +1848,9 @@
 			mtx_unlock(&swhash_mtx);
 			VM_OBJECT_UNLOCK(object);
 			if (uma_zone_exhausted(swap_zone)) {
-				printf("swap zone exhausted, increase kern.maxswzone\n");
+				if (atomic_cmpset_rel_int(&exhausted, 0, 1))
+					printf("swap zone exhausted, "
+					    "increase kern.maxswzone\n");
 				vm_pageout_oom(VM_OOM_SWAPZ);
 				pause("swzonex", 10);
 			} else
@@ -1856,6 +1859,9 @@
 			goto retry;
 		}
 
+		if (atomic_cmpset_rel_int(&exhausted, 1, 0))
+			printf("swap zone ok\n");
+
 		swap->swb_hnext = NULL;
 		swap->swb_object = object;
 		swap->swb_index = pindex & ~(vm_pindex_t)SWAP_META_MASK;