linux-kernel - Re: [PATCHv2 0/9] perf stat: Separate shadow counters code

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Date:	Wed, 3 Jun 2015 19:42:00 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	David Ahern <dsahern@...il.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCHv2 0/9] perf stat: Separate shadow counters code

Em Thu, Jun 04, 2015 at 12:38:24AM +0200, Jiri Olsa escreveu:
> On Wed, Jun 03, 2015 at 07:24:53PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Wed, Jun 03, 2015 at 07:07:05PM -0300, Arnaldo Carvalho de Melo escreveu:
> > > Em Wed, Jun 03, 2015 at 04:25:50PM +0200, Jiri Olsa escreveu:
> > > > hi,
> > > > sending cleanup/move of shadow counters. I need it
> > > > for my other changes of stat scripting, but I think
> > > > it can stand alone as a cleanup.
> > > > 
> > > > v2 changes:
> > > >   - move evsel id into 'struct perf_stat'
> > > >     and change the id functions namespace
> > > 
> > > Thanks, applied.
> > 
> > 15: struct perf_event_attr setup                             :sh: line 1: 27101 Segmentation fault      (core dumped) PERF_TEST_ATTR=/tmp/tmptb9pWi /home/acme/bin/perf stat -o /tmp/tmptb9pWi/perf.data kill > /dev/null 2>&1
> > sh: line 1: 27104 Segmentation fault      (core dumped) PERF_TEST_ATTR=/tmp/tmpWgRK9D /home/acme/bin/perf stat -o /tmp/tmpWgRK9D/perf.data -d kill > /dev/null 2>&1
> > sh: line 1: 27107 Segmentation fault      (core dumped) PERF_TEST_ATTR=/tmp/tmpmCOyBe /home/acme/bin/perf stat -o /tmp/tmpmCOyBe/perf.data -dd kill > /dev/null 2>&1
> > sh: line 1: 27110 Segmentation fault      (core dumped) PERF_TEST_ATTR=/tmp/tmpJP9x2e /home/acme/bin/perf stat -o /tmp/tmpJP9x2e/perf.data -ddd kill > /dev/null 2>&1
> >  Ok
> > 
> > Can you please check?
> 
> arghh.. sry, I remember running tests :-\ really ;-)
> it's the -d default events that do not set evsel->name

> attached patch fixes it, but I'll send v3 for the first patch
> 
> thanks,
> jirka
> 
> 
> ---
> diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
> index d22791d02db0..dba762da5679 100644
> --- a/tools/perf/util/stat.c
> +++ b/tools/perf/util/stat.c
> @@ -88,7 +88,7 @@ void perf_stat_evsel_id_init(struct perf_evsel *evsel)
>  	/* ps->id is 0 hence PERF_STAT_EVSEL_ID__NONE by default */
>  
>  	for (i = 0; i < PERF_STAT_EVSEL_ID__MAX; i++) {
> -		if (!strcmp(evsel->name, id_str[i])) {
> +		if (evsel->name && !strcmp(evsel->name, id_str[i])) {

Why not use perf_evsel__name() then?

>  			ps->id = i;
>  			break;
>  		}
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