Re: Review: DTrace probes (merged version)

From: Zdenek Kotala <Zdenek(dot)Kotala(at)Sun(dot)COM>
To: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Robert Lor <Robert(dot)Lor(at)Sun(dot)COM>, Robert Treat <xzilla(at)users(dot)sourceforge(dot)net>, jesus(at)omniti(dot)com
Subject: Re: Review: DTrace probes (merged version)
Date: 2008-07-04 17:42:12
Message-ID: 486E60F4.7080706@sun.com
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Alvaro Herrera napsal(a):
> Zdenek Kotala wrote:
>> Alvaro Herrera napsal(a):
>
>>>> proc-master-start
>>>> proc-master-stop
>>> What's "master" here?
>> Main process - postmaster.
>
> Huh, surely we're not interested in tracking postmaster start?
>

It depends. See following schema example

postgres::proc-master-start
{
tracking = 1
}

syscall:::open:entry
/ tracking == 1/
{
... print file name ...
}

postgres::proc-master-stop
{
tracking = 0
}

It is very useful because it say when you can start and stop monitoring for
example. But I'm not DTrace expert maybe there is different way how to do it.

Zdenek

--
Zdenek Kotala Sun Microsystems
Prague, Czech Republic http://sun.com/postgresql

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