Lists: | pgsql-hackers |
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From: | Joshua Tolley <eggyknap(at)gmail(dot)com> |
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To: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Dtrace probes documentation |
Date: | 2009-05-28 22:07:39 |
Message-ID: | 20090528220739.GA15201@eddie |
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Lists: | pgsql-hackers |
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 discrepancy?
Obvious patch attached, in case this needs to be changed.
- Josh / eggyknap
1: http://www.postgresql.org/docs/8.4/static/dynamic-trace.html
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dtrace-probes | text/plain | 18.6 KB |
From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Joshua Tolley <eggyknap(at)gmail(dot)com> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Dtrace probes documentation |
Date: | 2009-05-28 22:28:14 |
Message-ID: | 1856.1243549694@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Joshua Tolley <eggyknap(at)gmail(dot)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 discrepancy?
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.
regards, tom lane
From: | Joshua Tolley <eggyknap(at)gmail(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Dtrace probes documentation |
Date: | 2009-05-28 23:20:39 |
Message-ID: | 20090528232039.GD15201@eddie |
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Lists: | pgsql-hackers |
On Thu, May 28, 2009 at 06:28:14PM -0400, Tom Lane wrote:
> Joshua Tolley <eggyknap(at)gmail(dot)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 discrepancy?
>
> 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, anything.
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
From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | Joshua Tolley <eggyknap(at)gmail(dot)com> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Dtrace probes documentation |
Date: | 2009-05-31 20:07:40 |
Message-ID: | 14260.1243800460@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Joshua Tolley <eggyknap(at)gmail(dot)com> writes:
> On Thu, May 28, 2009 at 06:28:14PM -0400, Tom Lane wrote:
>> 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, anything.
> 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?
I think a better solution is to persuade the Systemtap guys that they
ought to accept the single-hyphen spelling. I've put in a request for
that, we'll see what they think ...
regards, tom lane
From: | fche(at)redhat(dot)com (Frank Ch(dot) Eigler) |
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To: | pgsql-hackers(at)postgresql(dot)org, Joshua Tolley <eggyknap(at)gmail(dot)com> |
Subject: | Re: Dtrace probes documentation |
Date: | 2009-06-01 17:15:40 |
Message-ID: | y0mws7v98oz.fsf@fche.csb |
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Lists: | pgsql-hackers |
Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> writes:
> [...]
>> 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?
>
> I think a better solution is to persuade the Systemtap guys that they
> ought to accept the single-hyphen spelling. [...]
Will do: http://sourceware.org/PR10225.
- FChE