linux-kernel - Re: Does perf inject preserve call chain data?

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Date:	Fri, 08 Jun 2012 09:44:56 -0700
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	David Ahern <dsahern@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>, ak@...ux.intel.com,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: Does perf inject preserve call chain data?

On Fri, 2012-06-08 at 11:38 -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, May 22, 2012 at 03:58:40PM -0600, David Ahern escreveu:
> > On 5/22/12 12:49 PM, Tim Chen wrote:
> > >Arnaldo,
> > >
> > >Wonder if perf inject munged the call chain data from perf record?
> > >
> > >When I do
> > >perf record -a -g -o - sleep 5 |perf inject -v -b  | perf report  -g -i -
> > >I get a complain from perf report
> > >
> > >Warning:
> > >Selected -g but no callchain data. Did you call 'perf record' without -g?
> > >
> > 
> > I believe the root cause is that the event list is not written to
> > the pipe. Using Arnaldo's git repo as of today (has fixes from
> > Stephane) this hack shows the info is there and can be processed.
> 
> How things stand here? Tim, did this fix things for you? If so, David,
> please resend with a proper subject line and a Tested-by: Tim, ok?
> 
> Thanks,
> 
> - Arnaldo
>  

It didn't fix things for me when I was testing on a westmere-ex machine.
I got

# ./perf record -a -g -o - sleep 5 |perf inject -v -b  | perf report -g  -i -
incompatible file format
incompatible file formatincompatible file formatselected -g but no callchain data. Did you call perf record without -g?

Testing was done on 3.5.0-rc1.

Tim

> > 
> > diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
> > index d58e414..60f3f17 100644
> > --- a/tools/perf/builtin-report.c
> > +++ b/tools/perf/builtin-report.c
> > @@ -256,7 +257,7 @@ static int perf_report__setup_sample_type(struct
> > perf_report *rep)
> >                     "'perf record' without -g?\n");
> >             return -EINVAL;
> >         }
> > -       if (symbol_conf.use_callchain) {
> > +       if (!self->fd_pipe && symbol_conf.use_callchain) {
> >             ui__warning("Selected -g but no callchain data. Did "
> >                     "you call 'perf record' without -g?\n");
> >             return -1;
> > 
> > A proper solution is needed.
> > 
> > David


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