From: Tom Lane <tgl@sss.pgh.pa.us>
To: Robert Haas <robertmhaas@gmail.com>
cc: Simon Riggs <simon@2ndquadrant.com>,
        "Andrey M. Borodin" <x4mmm@yandex-team.ru>,
        PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Subject: Re: Our naming of wait events is a disaster.
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Comments: In-reply-to Robert Haas <robertmhaas@gmail.com>
	message dated "Tue, 12 May 2020 16:10:18 -0400"
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Date: Tue, 12 May 2020 17:17:09 -0400
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Robert Haas <robertmhaas@gmail.com> writes:
> On Tue, May 12, 2020 at 4:00 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> Said user-facing documentation largely fails to explain that the
>> set of wait events can be enlarged by extensions; that needs to
>> be fixed, too.

> Is that true? How can they do that? I thought they were stuck with
> PG_WAIT_EXTENSION.

Extensions can definitely add new LWLock tranches, and thereby
enlarge the set of names in that category.  I haven't figured out
whether there are other avenues.

			regards, tom lane