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

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Message-ID: <55886F7A.30702@intel.com>
Date:	Mon, 22 Jun 2015 23:26:34 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
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

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@...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?

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

What does perf report --stdio give?
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