linux-kernel - Re: [PATCHv2 2/8] perf probe: Improve detection of file/function name in the probe pattern

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Message-ID: <20150313020319.GB14092@in.ibm.com>
Date:	Fri, 13 Mar 2015 07:33:19 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	mpe@...erman.id.au
Subject: Re: [PATCHv2 2/8] perf probe: Improve detection of file/function
 name in the probe pattern

On Thu, Mar 12, 2015 at 05:24:14PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Mon, Dec 15, 2014 at 08:20:32PM +0530, Naveen N. Rao escreveu:
> > Currently, perf probe considers patterns including a '.' to be a file.
> > However, this causes problems on powerpc ABIv1 where all functions have
> > a leading '.':
> > 
> >   $ perf probe -F | grep schedule_timeout_interruptible
> >   .schedule_timeout_interruptible
> >   $ perf probe .schedule_timeout_interruptible
> >   Semantic error :File always requires line number or lazy pattern.
> >     Error: Command Parse Error.
> > 
> > Fix this by checking the probe pattern in more detail.
> 
> Masami, can I have your Acked-by or Reviewed-by?

Arnaldo,

FWIW, I have reviewed this code...

Reviewed-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>

> 
> 
> - Arnaldo
> 
> > Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
> > ---
> >  tools/perf/util/probe-event.c | 23 ++++++++++++++++++++---
> >  1 file changed, 20 insertions(+), 3 deletions(-)
> > 
> > diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> > index 28eb141..9943ff3 100644
> > --- a/tools/perf/util/probe-event.c
> > +++ b/tools/perf/util/probe-event.c
> > @@ -999,6 +999,24 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
> >  		arg = tmp;
> >  	}
> >  
> > +	/*
> > +	 * Check arg is function or file name and copy it.
> > +	 *
> > +	 * We consider arg to be a file spec if and only if it satisfies
> > +	 * all of the below criteria::
> > +	 * - it does not include any of "+@%",
> > +	 * - it includes one of ":;", and
> > +	 * - it has a period '.' in the name.
> > +	 *
> > +	 * Otherwise, we consider arg to be a function specification.
> > +	 */
> > +	c = 0;
> > +	if (!strpbrk(arg, "+@%") && (ptr = strpbrk(arg, ";:")) != NULL) {
> > +		/* This is a file spec if it includes a '.' before ; or : */
> > +		if (memchr(arg, '.', ptr-arg))
> > +			c = 1;
> > +	}
> > +
> >  	ptr = strpbrk(arg, ";:+@%");
> >  	if (ptr) {
> >  		nc = *ptr;
> > @@ -1009,10 +1027,9 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
> >  	if (tmp == NULL)
> >  		return -ENOMEM;
> >  
> > -	/* Check arg is function or file and copy it */
> > -	if (strchr(tmp, '.'))	/* File */
> > +	if (c == 1)
> >  		pp->file = tmp;
> > -	else			/* Function */
> > +	else
> >  		pp->function = tmp;
> >  
> >  	/* Parse other options */
> > -- 
> > 2.1.3

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