But we track tuples because we can compare against the count given by the stats system. I don't know of a way (other than looking at the FSM, or contrib/pgstattuple ) to see how many dead pages exist.
I think making pg_autovacuum dependent of pgstattuple is very good idea.
Probably it might be a good idea to extend pgstattuple to return pages that are excessively contaminated and clean them ASAP. Step by step getting closer to daemonized vacuum.
Shridhar
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