diff --git a/sys/vm/swap_pager.c b/sys/vm/swap_pager.c
--- a/sys/vm/swap_pager.c
+++ b/sys/vm/swap_pager.c
@@ -154,6 +154,8 @@
 static u_long swap_total;
 static int sysctl_page_shift(SYSCTL_HANDLER_ARGS);
 
+static uma_zone_t __read_mostly swap_biozone;
+
 static SYSCTL_NODE(_vm_stats, OID_AUTO, swap, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
     "VM swap stats");
 
@@ -185,6 +187,11 @@
     CTLFLAG_RD, &swap_free_completed,
     "Number of deferred frees completed");
 
+static int __read_mostly swap_reserved_new_bios = 65536;
+SYSCTL_INT(_vm, OID_AUTO, swap_reserved_new_bios, CTLFLAG_RDTUN,
+    &swap_reserved_new_bios, 0,
+    "Number of reserved new swap bios for non-blocking allocation");
+
 static int
 sysctl_page_shift(SYSCTL_HANDLER_ARGS)
 {
@@ -658,6 +665,13 @@
 	if (!uma_zone_reserve_kva(swpctrie_zone, n))
 		printf("Cannot reserve swap pctrie zone, "
 		    "reduce kern.maxswzone.\n");
+
+	/* Initialize the swap bio zone if requested. */
+	if (swap_reserved_new_bios > 0) {
+		swap_biozone = g_io_new_uz("swap_bio");
+		uma_prealloc(swap_biozone, swap_reserved_new_bios);
+		uma_zone_reserve(swap_biozone, swap_reserved_new_bios);
+	}
 }
 
 bool
@@ -2880,20 +2894,20 @@
 	}
 	swapgeom_acquire(cp);
 	mtx_unlock(&sw_dev_mtx);
-	if (bp->b_iocmd == BIO_WRITE)
-		bio = g_new_bio();
-	else
-		bio = g_alloc_bio();
-	if (bio == NULL) {
-		mtx_lock(&sw_dev_mtx);
-		swapgeom_release(cp, sp);
-		mtx_unlock(&sw_dev_mtx);
-		bp->b_error = ENOMEM;
-		bp->b_ioflags |= BIO_ERROR;
-		printf("swap_pager: cannot allocate bio\n");
-		bufdone(bp);
-		return;
-	}
+	if (bp->b_iocmd == BIO_WRITE) {
+		bio = g_new_bio_uz(swap_biozone);
+		if (__predict_false(bio == NULL)) {
+			mtx_lock(&sw_dev_mtx);
+			swapgeom_release(cp, sp);
+			mtx_unlock(&sw_dev_mtx);
+			bp->b_error = ENOMEM;
+			bp->b_ioflags |= BIO_ERROR;
+			printf("swap_pager: cannot allocate bio\n");
+			bufdone(bp);
+			return;
+		}
+	} else
+		bio = g_alloc_bio_uz(swap_biozone);
 
 	bp->b_caller1 = bio;
 	bio->bio_caller1 = sp;