[PATCH v1 00/12] perf tests: Enhancements, speedups, and flakiness fixes

[Ian Rogers <irogers@google.com>]

This patch series introduces a comprehensive set of improvements to the perf
test suite, focusing on execution speed, reliability, and correctness.

It contains the following key updates:
1. Speed optimizations for shell tests (lock contention, off-cpu profiling,
   metrics validation) by scaling down workload durations and using lighter
   system-wide defaults.
2. Fixes for test flakiness in branch stack sampling, BPF counters on hybrid
   systems, Python JIT dump profiling, and trace record/replay.
3. A new robust retry helper (perf_record_with_retry) to ensure reliable
   recording of intermittent events in slow or virtualized environments.
4. Support for sub-second durations in noploop and thloop workloads to
   accelerate tests that only require brief sampling windows.
5. Fixes for terminal width truncation during parallel test execution, ensuring
   the progress output does not wrap or corrupt the screen when test names
   exceed the terminal width (including skipped tests).
6. Restrictions on core PMU bypass parsing to correctly enforce the
   --pmu-filter option.

The combined changes drastically reduce the total runtime of the test suite
while improving the stability of hardware-dependent and sampling-based tests.

Ian Rogers (12):
  perf parse-events: Restrict core PMU bypass to --cputype option
  perf test: Truncate test description to fit terminal width
  perf tests workloads: Support sub-second durations in noploop and
    thloop
  perf tests: Add robust record retry helper and use subsecond workloads
  perf tests: Skip metrics validation if system-wide recording lacks
    permission
  perf tests: Fix Python JIT dump profiling test failure
  perf tests: Fix flakiness in trace record and replay test
  perf tests: Fix flakiness in BPF counters test on hybrid systems
  perf tests: Fix flakiness in branch stack sampling tests
  perf tests: Speed up off-cpu profiling tests
  perf tests: Speed up lock contention analysis shell test
  perf tests: Speed up metrics checking shell tests

 tools/perf/builtin-stat.c                     |   2 +
 tools/perf/tests/builtin-test.c               |  95 +++++++---
 tools/perf/tests/parse-events.c               |  11 +-
 tools/perf/tests/pmu-events.c                 |   6 +-
 tools/perf/tests/shell/jitdump-python.sh      |  66 ++++---
 tools/perf/tests/shell/kvm.sh                 |  61 ++++---
 .../tests/shell/lib/perf_metric_validation.py |  11 +-
 tools/perf/tests/shell/lib/perf_record.sh     |  52 ++++++
 tools/perf/tests/shell/lock_contention.sh     |  30 +--
 tools/perf/tests/shell/pipe_test.sh           |   4 +-
 tools/perf/tests/shell/record.sh              | 172 +++++++++---------
 tools/perf/tests/shell/record_lbr.sh          |  50 +++--
 tools/perf/tests/shell/record_offcpu.sh       |  12 +-
 tools/perf/tests/shell/stat_all_metrics.sh    |  65 ++++---
 tools/perf/tests/shell/stat_all_pfm.sh        |   2 +-
 tools/perf/tests/shell/stat_bpf_counters.sh   |  27 ++-
 tools/perf/tests/shell/stat_metrics_values.sh |   9 +-
 tools/perf/tests/shell/test_brstack.sh        |   6 +-
 tools/perf/tests/shell/trace_record_replay.sh |  18 +-
 tools/perf/tests/workloads/noploop.c          |  15 +-
 tools/perf/tests/workloads/thloop.c           |  14 +-
 tools/perf/util/metricgroup.c                 |   4 +-
 tools/perf/util/parse-events.c                |  22 ++-
 tools/perf/util/parse-events.h                |  17 +-
 24 files changed, 494 insertions(+), 277 deletions(-)
 create mode 100644 tools/perf/tests/shell/lib/perf_record.sh

-- 
2.54.0.1136.gdb2ca164c4-goog