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

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Date:	Fri, 19 Jun 2015 13:22:32 -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 01:04:51PM -0300, Arnaldo Carvalho de Melo escreveu:
> 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.

Trying to test something at this point:

[root@...f4 ~]# find /sys -name "*intel_pt*"
/sys/bus/event_source/devices/intel_pt
/sys/devices/intel_pt
[root@...f4 ~]# perf record -e intel_pt//u ls
invalid or unsupported event: 'intel_pt//u'
Run 'perf list' for a list of valid events

 usage: perf record [<options>] [<command>]
    or: perf record [<options>] -- <command> [<options>]

    -e, --event <event>   event selector. use 'perf list' to list
available events
[root@...f4 ~]# uname -a
Linux perf4 4.1.0-rc8 #1 SMP Tue Jun 16 19:47:25 EDT 2015 x86_64 x86_64 x86_64 GNU/Linux
[root@...f4 ~]#

The kernel seems to have the intel_pt stuff and what I have in the
tooling side is at my tmp.perf/pt branch, will continue after lunch.

- Arnaldo
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