linux-kernel - Re: [PATCH V7 6/8] perf,tools: Dump per-sample freq/CPU%/CORE

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Date:	Mon, 31 Aug 2015 17:33:39 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Kan Liang <kan.liang@...el.com>, jolsa@...nel.org,
	a.p.zijlstra@...llo.nl, luto@...nel.org, mingo@...hat.com,
	eranian@...gle.com, ak@...ux.intel.com, mark.rutland@....com,
	adrian.hunter@...el.com, namhyung@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V7 6/8] perf,tools: Dump per-sample freq/CPU%/CORE_BUSY%
 in report -D

Em Mon, Aug 31, 2015 at 01:19:40PM +0200, Jiri Olsa escreveu:
> On Fri, Aug 28, 2015 at 05:48:07AM -0400, Kan Liang wrote:
> 
> SNIP
> 
> >  
> >  static struct machine *machines__find_for_cpumode(struct machines *machines,
> > @@ -1079,11 +1101,12 @@ static int machines__deliver_event(struct machines *machines,
> >  
> >  	switch (event->header.type) {
> >  	case PERF_RECORD_SAMPLE:
> > -		dump_sample(evsel, event, sample);
> >  		if (evsel == NULL) {
> >  			++evlist->stats.nr_unknown_id;
> >  			return 0;
> >  		}
> > +		dump_sample(evsel, event, sample);
> > +
> 
> could you submit this hunk separately.. seems like we could
> segfault in dump_sample if there's evsel == NULL, right?

Right, this one should be submitted separately, if there is a test right
after we use a pointer, I wouldn't even think about reading
dump_sample() code :-)

- Arnaldo
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