On Tue, Feb 2, 2016 at 10:49 AM, Andres Freund <and...@anarazel.de> wrote:
> I'm doubtful that anything that does the victim buffer search while
> holding the extension lock will actually scale in a wide range of
> scenarios. The copy scenario here probably isn't too bad because the
> copy ring buffes are in use, and because there's no reads increasing the
> usagecount of recent buffers; thus a victim buffers are easily found.

I agree that's an avenue we should try to explore.  I haven't had any
time to think much about how it should be done, but it seems like it
ought to be possible somehow.

Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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