[PATCH 0/4] coresight: Add ETR-PERF polling.

[Daniel Kiss]

This series adds a feature to ETR-PERF that sync the ETR buffer to perf
periodically. This is really handy when the system wide trace is used
because in this case the perf won't sync during the trace. In a per-thread
setup the traced program might not go to the kernel frequvently enought
to collect trace. Polling helps in both usecases. Can be used with strobing.
Tuning polling period is challanging, I'm working on an additional patch
that adds some metrics to help tune the polling period.

Daniel Kiss (4):
  coresight: tmc-etr: Advance buffer pointer in sync buffer.
  coresight: tmc-etr: Track perf handler.
  coresight: etm-perf: Export etm_event_cpu_path.
  coresight: Add ETR-PERF polling.

 .../testing/sysfs-bus-coresight-devices-tmc   |   8 +
 drivers/hwtracing/coresight/Makefile          |   2 +-
 .../hwtracing/coresight/coresight-etm-perf.c  |  10 +-
 .../hwtracing/coresight/coresight-etm-perf.h  |   1 +
 .../coresight/coresight-etr-perf-polling.c    | 316 ++++++++++++++++++
 .../coresight/coresight-etr-perf-polling.h    |  42 +++
 .../hwtracing/coresight/coresight-tmc-core.c  |   2 +
 .../hwtracing/coresight/coresight-tmc-etr.c   |  22 +-
 drivers/hwtracing/coresight/coresight-tmc.h   |   2 +
 9 files changed, 401 insertions(+), 4 deletions(-)
 create mode 100644 drivers/hwtracing/coresight/coresight-etr-perf-polling.c
 create mode 100644 drivers/hwtracing/coresight/coresight-etr-perf-polling.h

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2.25.1