There's also a tool called exmap <http://www.berthels.co.uk/exmap/>, which does something similar, although perhaps not as comprehensively. There's also a console version for embedded applications, called exmap-console <http://projects.o-hand.com/exmap-console> -- there was an interesting presentation at FOSDEM on it.
I like the Proportional Set Size and Unique Set Size measurements mentioned in the article -- hopefully they will be exposed in top.
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