| From: | Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com> |
|---|---|
| To: | Craig Ringer <craig(dot)ringer(at)enterprisedb(dot)com> |
| Cc: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [PATCH] Identify LWLocks in tracepoints |
| Date: | 2021-04-14 13:20:59 |
| Message-ID: | eaff8739-3eb6-12b7-57a8-b85c9700c7dc@enterprisedb.com |
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| Thread: | |
| Lists: | pgsql-hackers |
On 12.04.21 07:46, Craig Ringer wrote:
> > To use systemtap semaphores (the _ENABLED macros) you need to run
> dtrace
> > -g to generate a probes.o then link that into postgres.
> >
> > I don't think we do that. I'll double check soon.
>
> We do that. (It's -G.)
>
>
> Huh. I could've sworn we didn't. My mistake, it's there in
> src/backend/Makefile .
>
> In that case I'll amend the patch to use semaphore guards.
This whole thread is now obviously moved to consideration for PG15, but
I did add an open item about this particular issue
(https://wiki.postgresql.org/wiki/PostgreSQL_14_Open_Items, search for
"dtrace"). So if you could produce a separate patch that adds the
_ENABLED guards targeting PG14 (and PG13), that would be helpful.
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