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
@@ -169,8 +169,8 @@
     &swap_total, 0, sysctl_page_shift, "QU",
     "Total amount of available swap storage.");
 
-static int overcommit = 0;
-SYSCTL_INT(_vm, VM_OVERCOMMIT, overcommit, CTLFLAG_RW, &overcommit, 0,
+int vm_overcommit = 0;
+SYSCTL_INT(_vm, VM_OVERCOMMIT, overcommit, CTLFLAG_RW, &vm_overcommit, 0,
     "Configure virtual memory overcommit behavior. See tuning(7) "
     "for details.");
 static unsigned long swzone;
@@ -190,11 +190,6 @@
     CTLFLAG_RD, &swap_free_completed,
     "Number of deferred frees completed");
 
-/* bits from overcommit */
-#define	SWAP_RESERVE_FORCE_ON		(1 << 0)
-#define	SWAP_RESERVE_RLIMIT_ON		(1 << 1)
-#define	SWAP_RESERVE_ALLOW_NONWIRED	(1 << 2)
-
 static int
 sysctl_page_shift(SYSCTL_HANDLER_ARGS)
 {
@@ -286,7 +281,7 @@
 	prev = atomic_fetchadd_long(&swap_reserved, pincr);
 	r = prev + pincr;
 	s = swap_total;
-	oc = atomic_load_int(&overcommit);
+	oc = atomic_load_int(&vm_overcommit);
 	if (r > s && (oc & SWAP_RESERVE_ALLOW_NONWIRED) != 0) {
 		s += vm_cnt.v_page_count - vm_cnt.v_free_reserved -
 		    vm_wire_count();
diff --git a/sys/vm/vm.h b/sys/vm/vm.h
--- a/sys/vm/vm.h
+++ b/sys/vm/vm.h
@@ -165,6 +165,12 @@
 
 extern int vm_ndomains;
 
+/* bits from overcommit */
+#define	SWAP_RESERVE_FORCE_ON		(1 << 0)
+#define	SWAP_RESERVE_RLIMIT_ON		(1 << 1)
+#define	SWAP_RESERVE_ALLOW_NONWIRED	(1 << 2)
+extern int vm_overcommit;
+
 #ifdef _KERNEL
 struct ucred;
 bool swap_reserve(vm_ooffset_t incr);