verify predefined LWLocks have entries in wait_event_names.txt

(new thread)

On Tue, Jan 02, 2024 at 10:34:11AM -0500, Robert Haas wrote:
> On Wed, Dec 27, 2023 at 10:36 AM Nathan Bossart
> <nathandbossart(at)gmail(dot)com> wrote:
>> Thanks! I also noticed that WALSummarizerLock probably needs a mention in
>> wait_event_names.txt.
>
> Fixed.

I think we're supposed to omit the "Lock" suffix in wait_event_names.txt.

> It seems like it would be good if there were an automated cross-check
> between lwlocknames.txt and wait_event_names.txt.

+1. Here's a hastily-thrown-together patch for that. I basically copied
003_check_guc.pl and adjusted it for this purpose. This test only checks
that everything in lwlocknames.txt has a matching entry in
wait_event_names.txt. It doesn't check that everything in the predefined
LWLock section of wait_event_names.txt has an entry in lwlocknames.txt.
AFAICT that would be a little more difficult because you can't distinguish
between the two in pg_wait_events.

Even with this test, I worry that we could easily forget to add entries in
wait_event_names.txt for the non-predefined locks, but I don't presently
have a proposal for how to prevent that.

--
Nathan Bossart
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