| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Merlin Moncure <mmoncure(at)gmail(dot)com>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Set hint bits upon eviction from BufMgr |
| Date: | 2011-03-28 14:19:19 |
| Message-ID: | 4651.1301321959@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> On Mon, Mar 28, 2011 at 9:48 AM, Merlin Moncure <mmoncure(at)gmail(dot)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
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