Robert Haas <robertmhaas@gmail.com> writes:
> It looks like the only way anything can ever get put on the free list
> right now is if a relation or database is dropped. That doesn't seem
> too good.
Why not? AIUI the free list is only for buffers that are totally dead,
ie contain no info that's possibly of interest to anybody. It is *not*
meant to substitute for running the clock sweep when you have to discard
a live buffer.
regards, tom lane