Re: Design notes for BufMgrLock rewrite

Tom Lane wrote:
> I'm working on an experimental patch to break up the BufMgrLock along
> the lines we discussed a few days ago --- in particular, using a clock
> sweep algorithm instead of LRU lists for the buffer replacement strategy.
> I started by writing up some design notes, which are attached for
> review in case anyone has better ideas.
>
> One thing I realized quickly is that there is no natural way in a clock
> algorithm to discourage VACUUM from blowing out the cache. I came up
> with a slightly ugly idea that's described below. Can anyone do better?

Uh, is the clock algorithm also sequential-scan proof? Is that
something that needs to be done too?

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