BT_MINRESERVE
if (vm->vm_nfreetags > BT_MINRESERVE) {
vm->vm_nfreetags <= BT_MINRESERVE &&
while (vm->vm_nfreetags <= BT_MINRESERVE) {
if (vm->vm_nfreetags <= BT_MINRESERVE) {
while (vm->vm_nfreetags <= BT_MINRESERVE && (flags & VM_POPULATING) == 0) {