[PATCH 1/2] perf tools: inject capabilitity for CoreSight traces

Em Tue, Feb 13, 2018 at 03:18:02PM -0700, Mathieu Poirier escreveu:

On 7 February 2018 at 06:57, Robert Walker [off-list ref] wrote:

quoted

Added user space perf functionality to translate CoreSight traces into
instruction events with branch stack.

To invoke the new functionality, use the perf inject
tool with --itrace=il. For example, to translate the ETM trace from
perf.data into last branch records in a new inj.data file:

    $ perf inject --itrace=i100000il128 -i perf.data -o perf.data.new

The 'i' parameter to itrace generates periodic instruction events.  The
period between instruction events can be specified as a number of
instructions suffixed by i (default 100000).
The parameter to 'l' specifies the number of entries in the branch stack
attached to instruction events.
The 'b' parameter to itrace generates events on taken branches.

This patch also fixes the contents of the branch events used in perf report
- previously branch events were generated for each contiguous range of
instructions executed.  These are fixed to generate branch events between
the last address of a range ending in an executed branch instruction and
the start address of the next range.

Based on patches by Sebastian Pop [off-list ref] with additional fixes
and support for specifying the instruction period.

Originally-by: Sebastian Pop [off-list ref]
Signed-off-by: Robert Walker <redacted>

Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org>

Arnaldo - this should probably go through your tree but let me know if
you want to proceed otherwise.

I can pick it, but now I'm waiting for Robert to address your comments,
so haven't processed none of these two.

- Arnaldo
 

Robert - the work in coresight.txt should likely be published on its
own.  That way Arnaldo doesn't have to worry about it.