linux-kernel - Re: [PATCH v4 00/22] perf: Add infrastructure and support for Intel PT

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Date:	Mon, 01 Sep 2014 18:17:23 +0100
From:	Pawel Moll <pawel.moll@....com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Robert Richter <rric@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>,
	"kan.liang@...el.com" <kan.liang@...el.com>,
	Michael Williams <Michael.Williams@....com>,
	"ralf@...ux-mips.org" <ralf@...ux-mips.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>
Subject: Re: [PATCH v4 00/22] perf: Add infrastructure and support for Intel
 PT

On Mon, 2014-09-01 at 17:30 +0100, Peter Zijlstra wrote:
> On Wed, Aug 20, 2014 at 03:35:57PM +0300, Alexander Shishkin wrote:
> > This patchset adds support for Intel Processor Trace (PT) extension [1] of
> > Intel Architecture that allows the capture of information about software
> > execution flow, to the perf kernel infrastructure.

I'm particularly excited about the "to the perf kernel
infrastructure" :-)

> It would also be good if some other archs can comment on this (the
> generic parts obviously). There is the ARM CoreSight stuff 

We've got Mathieu Poirier at Linaro working on the drivers for CoreSight
components, with the latest (v5) version here:

http://thread.gmane.org/gmane.linux.ports.arm.kernel/351654

but it was mostly intended to have the processor trace decoded using a
separate tool in userspace. I must say that an idea of getting it all
into perf sounds really interesting.

I've copied Mathieu so he can have a look as well. As for me personally,
I'd like to have 48 hours to digest it all. I've just got back from a
very distant time zone and am suffering a monumental jet lag... 

Paweł

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