linux-kernel - Re: [PATCH -perf/perf/core 5/6] perf probe: Add variable filter support

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Message-ID: <20110117120721.GB3902@ghostprotocols.net>
Date:	Mon, 17 Jan 2011 10:07:21 -0200
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Franck Bui-Huu <vagabon.xyz@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, 2nddept-manager@....hitachi.co.jp,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Chase Douglas <chase.douglas@...onical.com>
Subject: Re: [PATCH -perf/perf/core  5/6] perf probe: Add variable filter
	support

Em Fri, Jan 14, 2011 at 11:42:05AM +0900, Masami Hiramatsu escreveu:
> (2011/01/14 6:18), Franck Bui-Huu wrote:
> > I'm wondering if the different syntax below could be simpler:
> > 
> >    $ perf probe add <probe>
> >    $ perf probe del <probe>
> >    $ perf probe show       
> >    $ perf probe list <line>
> >            ...       --vars[=<pattern>] [--externs] <probe>
> >            ...       --funcs[=<pattern>]
 
> Hm, well, if no one complains about changing the syntax of perf probe,
> it may make things simple (maybe we'll also have to drop "perf probe
> <PROBE>" syntax). Nowadays we already have perf-kvm, perf-sched, etc.
> which use sub-sub commands.
 
> IMHO, for avoiding confusion old options and "perf-list", below
> sub-sub commands are more suitable.
 
>    $ perf probe add <probe>
>    $ perf probe del <probe>
>    $ perf probe list
>    $ perf probe lines <line>
>    $ perf probe vars [--filter=<pattern>|-F <pattern>] [--extern] <probe>
>    $ perf probe funcs [--filter=<pattern>|-F <pattern>]

Right, and when packaging, we can do just like Ingo and Thomas are doing
with 'perf trace', create a hardlink and if argv[0] is 'probe', that is
an alias to 'perf probe', so we would do it just like:

$ probe add <probe>
$ probe del <probe>
$ probe list
$ probe lines <line>
$ probe vars [--filter=<pattern>|-F <pattern>] [--extern] <probe>
$ probe funcs [--filter=<pattern>|-F <pattern>]

[root@...icio ~]# probe
bash: probe: command not found...

Also google told me that there was an /sbin/probe utility, but that was
a long time ago, in the kernel-pcmcia-cs package, nowadays we have
pcmciautils and it doesn't have this command, so I think it is up for
grabs :-)

So I think that the 'probe funcs' makes sense, will apply that patch in
perf/core.

- Arnaldo
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