kern->metadata->conf->attr.subbuf_size
== default_get_metadata_subbuf_size() &&
kern->metadata->conf->attr.num_subbuf
== DEFAULT_METADATA_SUBBUF_NUM &&
kern->metadata->conf->attr.switch_timer_interval
kern->metadata->conf->attr.subbuf_size
== default_get_metadata_subbuf_size() &&
kern->metadata->conf->attr.num_subbuf
== DEFAULT_METADATA_SUBBUF_NUM &&
kern->metadata->conf->attr.switch_timer_interval