Robert Haas <robertmhaas@gmail.com> writes:
> OK, so this is getting simpler, but I'm wondering why we need
> dlist_move_tail() at all. It is a well-known fact that maintaining
> LRU ordering is expensive and it seems to be unnecessary for our
> purposes here.
Yeah ... LRU maintenance was another thing that used to be in the
catcache logic and was thrown out as far too expensive. Your idea
of just using a clock sweep instead seems plausible.
regards, tom lane
