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

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Date:	Mon, 22 Jun 2015 15:24:44 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH V6 08/17] perf tools: Add Intel PT support

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@...f4 ~]# perf evlist
intel_pt//u
sched:sched_switch
dummy:u
[root@...f4 ~]# perf report
[root@...f4 ~]#  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@...f4 ~]# 
[root@...f4 ~]# 
[root@...f4 ~]# perf report
[root@...f4 ~]# perf evlist
intel_pt//u
sched:sched_switch
dummy:u
[root@...f4 ~]# uname -r
4.1.0-rc8
[root@...f4 ~]# 

I am not getting any "intel_pt//u" event, ideas?

- Arnaldo
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