linux-kernel - Re: [PATCH 7/7] ftrace, perf: Add filter support for function trace event

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Date:	Thu, 22 Dec 2011 13:55:58 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	rostedt@...dmis.org, mingo@...hat.com, paulus@...ba.org,
	acme@...stprotocols.net, a.p.zijlstra@...llo.nl,
	linux-kernel@...r.kernel.org, aarapov@...hat.com
Subject: Re: [PATCH 7/7] ftrace, perf: Add filter support for function trace
 event

On Wed, Dec 21, 2011 at 11:07:58PM +0100, Frederic Weisbecker wrote:
> On Wed, Dec 21, 2011 at 07:56:31PM +0100, Jiri Olsa wrote:
> > Adding support to filter function trace event via perf
> > interface. It is now possible to use filter interface
> > in the perf tool like:
> > 
> >   perf record -e ftrace:function --filter="(ip == mm_*)" ls
> > 
> > The filter syntax is restricted to the the 'ip' field only,
> > and following operators are accepted '==' '!=' '||', ending
> > up with the filter strings like:
> > 
> >   "ip == f1 f2 ..." || "ip != f3 f4 ..." ...
> 
> Having the functions seperated like this sort of violates the
> grammar of the filtering interface.
> 
> The typical way to do this would have been to stringify the
> functions: ip == "f1 f2"
> 
> I feel a bit uncomfortable with "ip == f1 f2" scheme but perhaps
> we can live with that. Especially as otherwise that would
> require us to type "ip == \"f1 f2\"" for the whole filtering expression.

ugh, just realized there's a problem with this in the patch actually,
and it's not working as expected. I'll send out new version soon.. 

thanks,
jirka

> 
> Thoughts?
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