[PATCH libevl v2 0/4] evl-test: stress load and latmus integration

Extend evl-test to exercise the system while the tests run and to
measure latency at the end of a session.

The motivation is to allow running the suite under stress in CI to
surface bugs that only show up under load.
latmus run under that same load and with a latency threshold will allow
the pipeline to spot latency regressions.

Example:

  # run latmus under CPU/memory stress, fail above 200us,
  # keep the latmus report
  evl test --stress-cmd "stress-ng --cpu 4 --vm 2 --vm-bytes 1G" \
           latmus -- -T 60 -A 200

Changes since v1:
 * Introduce a small shell script wrapper in the test dir to add latmus
   to the testsuite instead of calling it in the end after the other tests.

Tobias Schaffner (4):
  evl-test: add stress command support for background load testing
  evl-test: improve help message with detailed usage information
  latmus: send setup messages to stdout instead of stderr
  tests: Add latmus wrapper script for evl-test integration

 latmus/latmus.c   |  4 ++--
 tests/latmus      | 16 +++++++++++++
 tests/meson.build | 11 +++++++++
 utils/evl-test    | 57 ++++++++++++++++++++++++++++++++++++++++++++++-
 4 files changed, 85 insertions(+), 3 deletions(-)
 create mode 100755 tests/latmus

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2.43.0