zsd_lookup_zone_byid
zone = zsd_lookup_zone_byid(ctl, zoneid);
prev_zone = zsd_lookup_zone_byid(ctl, prev_zoneid);
zone = zsd_lookup_zone_byid(ctl,
zone = zsd_lookup_zone_byid(ctl, proc->zspr_zoneid);
zone = zsd_lookup_zone_byid(ctl, vmusage[i].vmu_id);