Re: [HACKERS] exposing wait events for non-backends (was: Trackingwait event for latches)

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От Robert Haas
Тема Re: [HACKERS] exposing wait events for non-backends (was: Trackingwait event for latches)
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Msg-id CA+TgmoYES5nhkEGw9nZXU8_FhA8XEm8NTm3-SO+3ML1B81Hkww@mail.gmail.com
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Ответы Re: [HACKERS] exposing wait events for non-backends (was: Trackingwait event for latches)  ("David G. Johnston" <david.g.johnston@gmail.com>)
Re: [HACKERS] exposing wait events for non-backends (was: Trackingwait event for latches)  (Robert Haas <robertmhaas@gmail.com>)
Re: [HACKERS] exposing wait events for non-backends (was: Trackingwait event for latches)  (Alvaro Herrera <alvherre@2ndquadrant.com>)
Список pgsql-hackers
On Tue, Oct 4, 2016 at 11:59 AM, Robert Haas <robertmhaas@gmail.com> wrote:
> On Mon, Oct 3, 2016 at 8:43 PM, Michael Paquier
> <michael.paquier@gmail.com> wrote:
>> The rest looks good to me. Thanks for the feedback and the time!
>
> Thanks for the fixes.  I committed this with an additional compile
> fix, but the buildfarm turned up a few more problems that my 'make
> check-world' didn't find.  Hopefully those are fixed now, but we'll
> see.

So, one of the problems in this patch as committed is that for any
process that doesn't show up in pg_stat_activity, there's no way to
see the wait event information.  That sucks.  I think there are
basically two ways to fix this:

1. Show all processes that have a PGPROC in pg_stat_activity,
including auxiliary processes and whatnot, and use some new field in
pg_stat_activity to indicate the process type.

2. Add a second view, say pg_stat_system_activity, to show the
processes that don't appear in pg_stat_activity.  A bunch of columns
could likely be omitted, but there would be some duplication, too.

Preferences?

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company



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