linux-kernel - Re: [RFC PATCH 00/20] Coresight integration with perf

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Message-ID: <CANLsYkxEuJuCfYgdQvMLKYJzMrQOg4jP=p62nLmj3Q18Em6wwA@mail.gmail.com>
Date:	Fri, 2 Oct 2015 09:27:51 -0600
From:	Mathieu Poirier <mathieu.poirier@...aro.org>
To:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>, a.p.zijlstra@...llo.nl,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...hat.com>, Jon Corbet <corbet@....net>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Chunyan Zhang <zhang.chunyan@...aro.org>,
	Mike Leach <mike.leach@....com>, Tor Jeremiassen <tor@...com>,
	Al Grant <al.grant@....com>,
	Paweł Moll <pawel.moll@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, linux-doc@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 00/20] Coresight integration with perf

On 1 October 2015 at 22:53, Alexander Shishkin
<alexander.shishkin@...ux.intel.com> wrote:
> Mathieu Poirier <mathieu.poirier@...aro.org> writes:
>
>> On 30 September 2015 at 02:52, Alexander Shishkin
>> <alexander.shishkin@...ux.intel.com> wrote:
>>> Mathieu Poirier <mathieu.poirier@...aro.org> writes:
>>>
>>>> This patchset aims to integrate configuration and control of
>>>> the Coresight tracers with the perf sub-system.
>>>>
>>>> The goal is to use PMUs to represent tracers and the auxiliary
>>>> buffer enhancement to collect processor traces.  As such a lot
>>>> of work is done to move the current Coresight sysFS oriented
>>>> configuration and control commands to perf's AUX API.
>>>>
>>>> For the time being the work concentrates on ETMv3 and ETB1.0
>>>> sink buffers.  Work on ETMv4 and other type of sink buffers
>>>> will follow once a foundation has been established.
>>>>
>>>> Enhancement to the perf command line tool can be found here [1].
>>>> It is based on v4.2 but a rebase to v4.3-rcX will be available
>>>> shortly.
>>>>
>>>> Best regards,
>>>> Mathieu
>>>>
>>>> [1]. https://git.linaro.org/people/mathieu.poirier/coresight.git/shortlog/refs/heads/perf-v4.2
>>>
>>> I had a peek there -- didn't see an actual decoder for the ETM/PTM
>>> binary stream or did I miss it somehow?
>>
>> A stream decoder is not included in this patch set but a couple of
>> people are currently working on it.
>
> Ok, thanks. Can you provide instructions in the next version on how one
> can use this code to get a trace and decode it?

I'm afraid it won't be ready for the next version.  I will publish
instructions as soon as the code is mature enough.

>
> Regards,
> --
> Alex
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