On 19 December 2015 at 10:42, Rabin Vincent [off-list ref] wrote:

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

quoted

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.

You are correct.  The team is working on a trace decoder that will be
embedded in the perf tool suite.

# 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