Re: Set hint bits upon eviction from BufMgr

Robert Haas <robertmhaas@gmail.com> writes:
> On Mon, Mar 28, 2011 at 9:48 AM, Merlin Moncure <mmoncure@gmail.com> wrote:
>> I was thinking about setting a
>> flag in the buffer (BM_HEAP) that gets set by the loader which flags
>> the buffer for later inspection. �Is there a simpler way to do this?

> Hmm.  That's slightly crufty, but it might be OK.  At least, I don't
> have a better idea.

The major problem with all of this is that the bgwriter has no idea
which buffers contain heap pages.  And I'm not convinced it's a good
idea to try to let it know that.  If we get to the point where bgwriter
is trying to do catalog accesses, we are in for a world of pain.
(Can you say "modularity violation"?  How about "deadlock"?)
        regards, tom lane