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

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Message-ID: <20150603223824.GA25840@krava.redhat.com>
Date:	Thu, 4 Jun 2015 00:38:24 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
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

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])) {
 			ps->id = i;
 			break;
 		}
--
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