umem_depot_alloc
while (reap-- && (mp = umem_depot_alloc(cp, &cp->cache_full)) != NULL)
while (reap-- && (mp = umem_depot_alloc(cp, &cp->cache_empty)) != NULL)
fmp = umem_depot_alloc(cp, &cp->cache_full);
emp = umem_depot_alloc(cp, &cp->cache_empty);