CoreSight May 2016

coresight@lists.linaro.org

3 participants
2 discussions

Abstract for ELC-E 2016 CoreSight presentation

by Mathieu Poirier

Good day all, Here's the first draft of the "abstract" I intend to submit for ELC-E in Berlin. Keeping in mind the 900 character limit (this is already 880), please have a read and get back to me with your thoughts. [Begin] The CoreSight framework available in the Linux kernel has recently been integrated with the Perf core, making HW assisted tracing on ARM systems accessible to developers working on a wide spectrum of products. This presentation will start by giving a brief overview of the CoreSight technology itself before presenting the current solution, from trace collection in kernel space to off system trace decoding. To help with the latter part the Open CoreSight Decoding Library (openCSD) is introduced. OpenCSD is an open source library assisting in the decoding of collected trace data. We will see how it is used with the existing perf tools to provide an end-to-end solution for CoreSight trace decoding. The presentation will conclude with trace acquisition and decoding scenarios, along with tips on how to interpret trace information rendered by the perf tools. [End] Many thanks, Mathieu

8 years, 7 months

[PATCH 0/4] perf tools: miscellaneous fix related to cs-etm

by Mathieu Poirier

Hello Tor, While ramping up on the "perf report" and "perf script" features I fixed a few things and decided to play a little: 1/4: No influence on the current results but good to fix. 2/4: That changes a lot of things when multiple buffers have been collected. 3/4: No change in functionality, just cleanup. 4/4: Enhancement to make the output easier to read. These changes can be found here[1]. If this is good with you I'll push them to gitHub for the 4.7 cycle. Regards, Mathieu [1]. https://git.linaro.org/people/mathieu.poirier/coresight.git/shortlog/refs/h… Mathieu Poirier (4): cs-etm: avoid casting variable cs-etm: account for each trace buffer in the queue cs-etm: removing unecessary structure field cs-etm: associating output packet with CPU they executed on tools/perf/scripts/python/cs-trace-disasm.py | 2 + tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 15 +++- tools/perf/util/cs-etm-decoder/cs-etm-decoder.h | 1 + tools/perf/util/cs-etm.c | 103 +++++++++++++++++++----- tools/perf/util/cs-etm.h | 7 ++ 5 files changed, 106 insertions(+), 22 deletions(-) -- 2.5.0

8 years, 7 months

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CoreSight May 2016