Em Tue, Feb 13, 2018 at 03:18:02PM -0700, Mathieu Poirier escreveu:
On 7 February 2018 at 06:57, Robert Walker robert.walker@arm.com wrote:
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.newThe '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 s.pop@samsung.com with additional fixes and support for specifying the instruction period.
Originally-by: Sebastian Pop s.pop@samsung.com Signed-off-by: Robert Walker robert.walker@arm.com
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.