Horton

Re: 2nd Level Buffer Cache

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Jim Nasby <jim@nasby.net>, Jeff Janes <jeff.janes@gmail.com>, Kevin Grittner <Kevin.Grittner@wicourts.gov>, rsmogura <rsmogura@softperience.eu>, PG Hackers <pgsql-hackers@postgresql.org>
Date: 2011-03-23T22:12:12Z
Lists: pgsql-hackers 
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