Re: pgsql: Improve LWLock scalability.

On 2014-12-25 14:13:08 -0500, Tom Lane wrote:
> Andres Freund <andres@anarazel.de> writes:
> > This broke dtrace probes in a trivial way. Looking at the log made me
> > notice though that the probes in lwlock.c generate warnings since the
> > tranche changes went in.
>
> Yeah, dtrace has never behaved very nicely with "const foo *" arguments.
> This is a bug in dtrace, not in our usage of it, and I don't think we
> should de-constify our code to work around the warnings.

Great, agreed.

> > Personally I think at this point we could just rip the probe support
> > out, but I'm not going to fight for that in earnest.
>
> Not without a replacement for the functionality, IMO.

Fine with me, I just always had the impression that nobody uses them - I
very well might be wrong. Personally I just use 'perf probe' to add
tracepoints dynamically, where I need them. I assume others are doing
similar things.

Greetings,

Andres Freund

--
 Andres Freund                       http://www.2ndQuadrant.com/
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