From: | Michael Paquier <michael(at)paquier(dot)xyz> |
---|---|
To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
Cc: | Andres Freund <andres(at)anarazel(dot)de>, pgsql-committers(at)lists(dot)postgresql(dot)org |
Subject: | Re: pgsql: Add wait event for fsync of WAL segments |
Date: | 2018-07-03 22:32:20 |
Message-ID: | 20180703223220.GA1672@paquier.xyz |
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Lists: | pgsql-committers pgsql-hackers |
On Tue, Jul 03, 2018 at 04:12:23PM -0400, Alvaro Herrera wrote:
> On 2018-Jul-03, Andres Freund wrote:
>
> > On 2018-07-03 15:13:20 -0400, Alvaro Herrera wrote:
> > > Are the numerical values actually exposed to the world? I thought the
> > > only way to this info was through the system views, which surely expose
> > > the names, not the numbers.
> >
> > There's at least some work at high frequency sampling of these, and I
> > assume that's not going through SQL, but rather C functions.
>
> You're right.
My take is a background worker which connects to shared memory and scans
directly ProcArray entries.
> Anyway, it's not a huge deal to me. If Michael doesn't want to
> backpatch it, it's his call, and I don't have the cycles to do it myself
> right now either. If some other committer cares about it, well ...
New wait events on HEAD are adapted to HEAD in my opinion, so I would
keep the code as it is now. If anybody wishes to back-patch the change,
of course feel free to do so.
--
Michael
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