set_is_seen
setup_sysctl_set(&ns->ipc_set, &set_root, set_is_seen);
setup_sysctl_set(&ns->mq_set, &set_root, set_is_seen);
setup_sysctl_set(&pidns->set, &pid_table_root, set_is_seen);
setup_sysctl_set(&ns->set, &set_root, set_is_seen);