kmem_anon_desc_t
kmem_anon_desc_t kp;
void *kmem_alloc_swapbacked(kmem_anon_desc_t *kp, vm_size_t size,
void kmem_free_swapbacked(kmem_anon_desc_t *kp);
kmem_alloc_swapbacked(kmem_anon_desc_t *kp, vm_size_t size, vm_subsys_t id)
kmem_free_swapbacked(kmem_anon_desc_t *kp)