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Date: Thu, 28 May 2009 17:20:39 -0600
From: Joshua Tolley <eggyknap@gmail.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-hackers@postgresql.org
Subject: Re: Dtrace probes documentation
Message-ID: <20090528232039.GD15201@eddie>
References: <20090528220739.GA15201@eddie> <1856.1243549694@sss.pgh.pa.us>
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On Thu, May 28, 2009 at 06:28:14PM -0400, Tom Lane wrote:
> Joshua Tolley <eggyknap@gmail.com> writes:
> > The dtrace probes documentation [1] spells each probe name with dashes
> > ("transaction-start", "transaction-commit", etc.). Yet as far as I can =
see,
> > dtrace only works if you spell the probe names with double underscores
> > ("transaction__start", "transaction__commit", etc.). Why the discrepanc=
y?
>=20
> Read 26.4.3 and .4.  I don't know why they have this bizarre set of
> conventions, but the single-hyphen version is the spelling
> most visible to end users.

I thought it might be something like that. I've been playing with SystemTap,
and found that only the double-underscore version works for ... well, anyth=
ing.
See http://blog.endpoint.com/2009/05/postgresql-with-systemtap.html for
details. Perhaps it's worth noting in the documentation that SystemTap users
will need to use the double-underscore version?

- Josh / eggyknap

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