linux-kernel - Re: [PATCH V7 00/24] Coresight integration with perf

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Date:	Sat, 19 Dec 2015 18:42:31 +0100
From:	Rabin Vincent <rabin@....in>
To:	Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:	gregkh@...uxfoundation.org, alexander.shishkin@...ux.intel.com,
	zhang.chunyan@...aro.org, mike.leach@....com, tor@...com,
	al.grant@....com, fainelli@...adcom.com,
	linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V7 00/24] Coresight integration with perf

On Fri, Dec 18, 2015 at 01:58:56PM -0700, Mathieu Poirier wrote:
> 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.

These patches allow the trace to be recorded with perf, but what do you
use to actually get something useful out of the resulting perf.data?
AFAICS it can't be processed by perf script or the other perf tools.

# echo 1 > /sys/bus/coresight/devices/54162000.etb/enable_sink

# perf record -e cs_etm// true 
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.032 MB perf.data ]

# perf script
0x188 [0x80]: failed to process type: 70
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