Re: Tracking wait event for latches

From: Michael Paquier <michael(dot)paquier(at)gmail(dot)com>
To: Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru>, PostgreSQL mailing lists <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Tracking wait event for latches
Date: 2016-09-28 06:54:28
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On Wed, Sep 28, 2016 at 3:40 PM, Thomas Munro
<thomas(dot)munro(at)enterprisedb(dot)com> wrote:
> On Wed, Sep 28, 2016 at 6:25 PM, Michael Paquier
> <michael(dot)paquier(at)gmail(dot)com> wrote:
>> wait-event-set-v8.patch
> Ok, I'm just about ready to mark this as 'Ready for Committer'.


> Just a couple of things:
> + pgstat_report_wait_start((uint8) classId, (uint16) eventId);
> Unnecessary casts.


> + <row>
> + <entry morerows="5"><literal>Client</></entry>
> + <entry><literal>SecureRead</></entry>
> + <entry>Waiting to read data from a secure connection.</entry>
> + </row>
> + <row>
> + <entry><literal>SecureWrite</></entry>
> + <entry>Waiting to write data to a secure connection.</entry>
> + </row>
> I think we want to drop the word 'secure' from the description lines
> in this patch. Then I think we plan to make a separate patch that
> will rename the functions themselves and the corresponding wait points
> to something more generic?

Robert mentioned ClientRead/ClientWrite upthread. I still think that
SecureRead/SecureWrite is better as it respects the routine name where
the wait point is, and that's consistent with the rest.

> I'm assuming that my suggestions for making WE_WAL_SENDER_WAIT_WAL and
> WE_WAL_SENDER_MAIN have a dynamically chosen class ID would also be
> material for another patch, but it doesn't matter much because those
> processes won't show up yet anyway.

WAL senders do show up since 8299471 because they are counted as in
max_connections. That's pretty cool combined with this patch.

I am sending a new patch to save 30s to the committer potentially
looking at this patch.

Attachment Content-Type Size
wait-event-set-v9.patch application/x-patch 35.1 KB

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