Looks like a pretty useful feature all around. While reading the description I 
noticed a few typos:

* Mathieu Poirier [off-list ref] wrote:

+Regardless of the amnout ETM/PTM IP block in a system (usually equal to the
+amount of processor core), the "cs_etm" PMU will be listed only once.

s/amnout/amount

+Tracing limited to user and kernel space can also be used to narrow the amount
+of collected tracers:

s/tracers/traces

+The Coresight PMUs can be configured to work in "full trace" or "snapshot" mode.
+In full trace mode trade acquisition is enable from beginning to end with trace
+data being recorded continuously:

s/trade acquisition/trace acquisition
s/is enable from/is enabled from

+Since this can lead to a significant amount of data and that some device are
+limited in disk space snapshot mode can be used instead.

s/and that some device are limited in disk space/
  and because some devices are limited in disk space

+Trace data collected during trace runs end up in the centennial "perf.data"
+file.

hey, perf isn't 100 years old! :-)

s/centennial/central ?

Also, 'data' is singular in this context, so I think:

s/data collected during trace runs end up in the
 /data collected during trace runs ends up in the

[...] Trace configuration information necessary for trace decoding are also
+embedded in the "perf.data" file.

s/are/is

 Two new headers, 'PERF_RECORD_AUXTRACE_INFO'
+and 'PERF_RECORD_AUXTRACE' have been added to list of event types in order to
+find out where the different sections start.

s/to list of event types
 /to the list of event types

+
+It is worth nothing that a set of metadata information exists for each tracer
+that participated in a trace run. [...]

s/nothing
 /noting

  As such if 5 processors have been engaged,

+5 set of metadata will be found in the perf.data file.

s/5 set of metadata
 /5 sets of metadata

+Metadata information is collected directly from the ETM/PTM management registers
+using the sysFS interface.  Since there is not way for the perf command line
+tool to associate a CPU with a tracer, a symbolic link has been created between
+the cs_etm sysFS event directory and each Coresight tracer:

s/there is not way
 /there is no way

+As with the perf method described above, a coresight sink needs to be identify
+before trace collection can commence.

Btw., 'Coresight' is spelled in two different ways throughout this document: 
capitalized and non-capitalized. Please pick one variant and use it consistently.

 any given moment.  As a generic operation, all device pertaining to the sink
-class will have an "active" entry in sysfs:

s/all device pertaining to
 /all devices pertaining to

Thanks,

	Ingo