linux-kernel - Re: [PATCH] perf: fix wrong hw

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Message-ID: <20120627190725.GA1380@krava.redhat.com>
Date:	Wed, 27 Jun 2012 21:07:25 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	Jovi Zhang <bookjovi@...il.com>, mingo@...hat.com,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf: fix wrong hw_breakpoint documentation

On Wed, Jun 27, 2012 at 01:15:57PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Wed, Jun 27, 2012 at 05:59:34PM +0900, Namhyung Kim escreveu:
> > Hi, Jovi
> > 
> > On Wed, 27 Jun 2012 16:39:19 +0800, Jovi Zhang wrote:
> > > From f5f9c3a064482cf3d0fb7ed788c66630bddbfc79 Mon Sep 17 00:00:00 2001
> > > From: Jovi Zhang <bookjovi@...il.com>
> > > Date: Wed, 27 Jun 2012 16:09:21 +0800
> > > Subject: [PATCH] perf: fix wrong hw_breakpoint documentation
> > >
> > > read-write access hw_breakpoint event is passed as 'mem:addr',
> > > 'mem:0x1000:rw' is parsed as invalid argument currently.
> > >
> > 
> > It should be a bug in event parser. I guess the patch below will fix it:
> 
> Jiri,
> 
> 	Ack? If so, Namhyung, can you send a patch with his Ack?
> 
> - Arnaldo
>  
> > 
> > diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
> > index 488362e14133..aafca33a8a09 100644
> > --- a/tools/perf/util/parse-events.l
> > +++ b/tools/perf/util/parse-events.l
> > @@ -76,7 +76,7 @@ num_hex               0x[a-fA-F0-9]+
> >  num_raw_hex    [a-fA-F0-9]+
> >  name           [a-zA-Z_*?][a-zA-Z0-9_*?]*
> >  modifier_event [ukhpGH]{1,8}
> > -modifier_bp    [rwx]
> > +modifier_bp    [rwx]+
> >  
> >  %%
> >  

we could have it more precise with

-modifier_bp    [rwx]
+modifier_bp    [rwx]{1,3}

and fail parse_breakpoint_type function for nonsense types
aaand automated tests updated ;)

jirka
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