| From: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Kuntal Ghosh <kuntalghosh(dot)2007(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>, Craig Ringer <craig(at)2ndquadrant(dot)com>, Kevin Grittner <kgrittn(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru>, PostgreSQL mailing lists <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: exposing wait events for non-backends (was: Tracking wait event for latches) |
| Date: | 2017-03-15 02:57:56 |
| Message-ID: | CAB7nPqRwfHiaR1Ocrg69G9ZG6LGDOmnt8H2h1syyLdL0jsRT5w@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Mar 15, 2017 at 4:52 AM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> On Tue, Mar 14, 2017 at 7:22 AM, Kuntal Ghosh
> <kuntalghosh(dot)2007(at)gmail(dot)com> wrote:
>> I do have extended localBackendStatusTable with slots for non-backend
>> processes. But, I've renamed it as localProcStatusTable since it
>> includes all processes. I'll keep the variable name as
>> localBackendStatusTable in the updated patch to avoid any confusion.
>> I've extended BackendStatusArray to store auxiliary processes.
>> Backends use slots indexed in the range from 1 to MaxBackends
>> (inclusive), so we use MaxBackends + AuxProcType + 1 as the index of
>> the slot for an auxiliary process.
>
> I think the subject of this the thread, for which I'm probably to
> blame, is bad terminology. The processes we're talking about exposing
> in pg_stat_activity here are really backends, too, I think. They're
> just ... special backends. So I would tend to avoid any backend ->
> process type of renaming.
FWIW, my impression on the matter matches what is written in this paragraph.
--
Michael
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