up-to-date docs on vacuum

[Tomas Vondra <tv@xxxxxxxx>]

Hello,

I'm looking for some 'up-to-date' documentation about the physical 
storage architecture used in postgresql, especially with respect to 
vacuuming and maintenance in general. I've found some basics in the 
documentation, and some interesting articles from 1987 (so I'm not sure 
about it's relevance to the current state). Is there some other 
documentation / articles on this topic or do I have to study the sources?

Tomas