Robert Haas <[email protected]> writes:
> On Wed, Nov 29, 2017 at 11:17 PM, Tom Lane <[email protected]> wrote:
>> The thing that makes me uncomfortable about this is that we used to have a
>> catcache size limitation mechanism, and ripped it out because it had too
>> much overhead (see commit 8b9bc234a). I'm not sure how we can avoid that
>> problem within a fresh implementation.
> At the risk of beating a dead horse, I still think that the amount of
> wall clock time that has elapsed since an entry was last accessed is
> very relevant.
While I don't object to that statement, I'm not sure how it helps us
here. If we couldn't afford DLMoveToFront(), doing a gettimeofday()
during each syscache access is surely right out.
regards, tom lane
