Re: [PATCH V6 08/17] perf tools: Add Intel PT support

[Adrian Hunter]

On 22/06/2015 9:24 p.m., Arnaldo Carvalho de Melo wrote:
> Em Fri, Jun 19, 2015 at 04:41:56PM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Fri, Jun 19, 2015 at 10:33:43PM +0300, Adrian Hunter escreveu:
> > > On 19/06/2015 7:04 p.m., Arnaldo Carvalho de Melo wrote:
> > > > Em Fri, May 29, 2015 at 04:33:36PM +0300, Adrian Hunter escreveu:
> > > > > Add support for Intel Processor Trace.
> >
> > > > > Intel PT support fits within the new auxtrace infrastructure.
> > > > > Recording is supporting by identifying the Intel PT PMU,
> > > > > parsing options and setting up events.  Decoding is supported
> > > > > by queuing up trace data by cpu or thread and then decoding
> > > > > synchronously delivering synthesized event samples into the
> > > > > session processing for tools to consume.
> >
> > > > So, at this point what commands should I use to test this? I expected to
> > > > be able to have some command here, in this changeset log, telling me
> > > > that what has been applied so far + this "Add Intel PT support", can be
> > > > used in such and such a fashion, obtaining this and that output.
> >
> > > > Now I'll go back and look at the cover letter to see what I can do at
> > > > this point and with access to a Broadwell class machine.
> >
> > > Actually you need the next patch "perf tools: Take Intel PT into use" to do anything.
> >
> > Yeah, saw that, the title of this patch fooled me into thinking that
> > Intel PT support was added :-)
> >
> > Anyway, stopping for a moment to push stuff ready to Ingo, will get back
> > to this after that.
>
> So, got back to it, added that "take it into use" patch and now trying
> to follow that documentation:
>
> [root@perf4 ~]# perf evlist
> intel_pt//u
> sched:sched_switch
> dummy:u
> [root@perf4 ~]# perf report
> [root@perf4 ~]#  perf record -e intel_pt//u -a sleep 10
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.379 MB perf.data ]
> [root@perf4 ~]#
> [root@perf4 ~]#
> [root@perf4 ~]# perf report
> [root@perf4 ~]# perf evlist
> intel_pt//u
> sched:sched_switch
> dummy:u
> [root@perf4 ~]# uname -r
> 4.1.0-rc8
> [root@perf4 ~]#
>
> I am not getting any "intel_pt//u" event, ideas?

Events are synthesized by the decoder.  You should see 'instructions:u' events.

What does perf report --stdio give?
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