slabzone
zone_free_item(slabzone(keg->uk_ipers), slab_tohashslab(slab),
hslab = zone_alloc_item(slabzone(keg->uk_ipers), NULL,
zone_free_item(slabzone(keg->uk_ipers),
total += slabzone(kl->ipers)->uz_keg->uk_rsize;
total += slabzone(keg->uk_ipers)->uz_keg->uk_rsize;