| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
| Cc: | Jim Nasby <decibel(at)decibel(dot)org>, Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: autovacuum starvation |
| Date: | 2007-05-08 05:29:23 |
| Message-ID: | 23200.1178602163@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Alvaro Herrera <alvherre(at)commandprompt(dot)com> writes:
> We could have the postmaster signal the launcher, but the signal cannot
> contain much useful info because the postmaster does generally not want
> to write in shared memory.
The postmaster already touches/writes in shared memory in pmsignal.c.
The trick here is that whatever it does should be sufficiently
constrained that arbitrarily-bad corruption of shared memory can't
crash or freeze the postmaster. If you can meet that restriction,
feel free to introduce some more signaling knowledge.
regards, tom lane
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