[GIT PULL] RTLA: Updates for 7.0

[Steven Rostedt]

Linus,

Real-Time Linux Analysis tooling patches for v7.0

- Remove unused function declarations

  Some functions were removed in recent code consolidation 6.18, but
  their prototypes were not removed from headers. Remove them.

- Set stop threshold after enabling instances

  Prefer recording samples without stopping on them on the start of
  tracing to stopping on samples that are never recorded. This fixes
  flakiness of some RTLA tests and unifies behavior of sample collection
  between tracefs mode and BPF mode.

- Consolidate usage help message implementation

  RTLA tools (osnoise-top, osnoise-hist, timerlat-top, timerlat-hist)
  each implement usage help individually. Move common logic between
  them into a new function to reduce code duplication.

- Add BPF actions feature

  Add option --bpf-action to attach a BPF program (passed as filename of
  its ELF representation) to be executed via BPF tail call at latency
  threshold.

- Consolidate command line option parsing

  Each RTLA tool implements the parsing of command line options
  individually. Now that we have a common structure for parameters,
  unify the parsing of those options common among all four tools into
  one function.

- De-duplicate cgroup common code

  Two functions in utils.c, setting cgroup for comm and setting cgroup
  for pid, duplicate code for constructing the cgroup path. Extract it
  to a new helper function.

- String and error handling fixes and cleanups

  There were several instances of unsafe string and error handling that
  could cause invalid memory access; fix them. Also, remove a few unused
  headers, update .gitignore, and deduplicate code.


Please pull the latest trace-rtla-v7.0 tree, which can be found at:


  git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git
trace-rtla-v7.0

Tag SHA1: ff72806864d3e8be29ce145576bed85a013be3d8
Head SHA1: 6ea8a206108fe8b5940c2797afc54ae9f5a7bbdd


Costa Shulyupin (12):
      tools/rtla: Remove unused function declarations
      tools/rtla: Add common_usage()
      tools/rtla: Add common_parse_options()
      tools/rtla: Consolidate -c/--cpus option parsing
      tools/rtla: Consolidate -C/--cgroup option parsing
      tools/rtla: Consolidate -D/--debug option parsing
      tools/rtla: Consolidate -d/--duration option parsing
      tools/rtla: Consolidate -e/--event option parsing
      tools/rtla: Consolidate -P/--priority option parsing
      tools/rtla: Consolidate -H/--house-keeping option parsing
      tools/rtla: Deduplicate cgroup path opening code
      rtla: Fix parse_cpu_set() bug introduced by strtoi()

Crystal Wood (1):
      rtla: Set stop threshold after all instances are enabled

Tomas Glozar (7):
      rtla/timerlat: Support tail call from BPF program
      rtla/timerlat: Add --bpf-action option
      rtla/timerlat: Add example for BPF action program
      rtla/tests: Test BPF action program
      rtla/tests: Run Test::Harness in verbose mode
      Documentation/rtla: Rename sample/ to example/
      Documentation/rtla: Document --bpf-action option

Wander Lairson Costa (10):
      rtla: Introduce for_each_action() helper
      rtla: Replace atoi() with a robust strtoi()
      rtla: Use standard exit codes for result enum
      rtla: Remove redundant memset after calloc
      rtla: Remove unused headers
      rtla: Fix NULL pointer dereference in actions_parse
      rtla: Add generated output files to gitignore
      rtla: Make stop_tracing variable volatile
      rtla: Ensure null termination after read operations in utils.c
      rtla: Fix parse_cpu_set() return value documentation

----
 .../tools/rtla/common_timerlat_options.txt         |  20 ++-
 tools/tracing/rtla/.gitignore                      |   4 +
 tools/tracing/rtla/Makefile                        |  19 ++-
 tools/tracing/rtla/example/timerlat_bpf_action.c   |  16 +++
 .../rtla/{sample => example}/timerlat_load.py      |   0
 tools/tracing/rtla/src/actions.c                   |  17 +--
 tools/tracing/rtla/src/actions.h                   |   5 +
 tools/tracing/rtla/src/common.c                    | 140 ++++++++++++++++++++-
 tools/tracing/rtla/src/common.h                    |  10 +-
 tools/tracing/rtla/src/osnoise.c                   |  17 +--
 tools/tracing/rtla/src/osnoise.h                   |   8 --
 tools/tracing/rtla/src/osnoise_hist.c              |  76 ++---------
 tools/tracing/rtla/src/osnoise_top.c               |  90 +++----------
 tools/tracing/rtla/src/timerlat.bpf.c              |  25 +++-
 tools/tracing/rtla/src/timerlat.c                  |  29 ++---
 tools/tracing/rtla/src/timerlat.h                  |   2 +-
 tools/tracing/rtla/src/timerlat_bpf.c              |  66 ++++++++++
 tools/tracing/rtla/src/timerlat_bpf.h              |   7 +-
 tools/tracing/rtla/src/timerlat_hist.c             |  80 +++---------
 tools/tracing/rtla/src/timerlat_top.c              |  80 +++---------
 tools/tracing/rtla/src/trace.c                     |   1 -
 tools/tracing/rtla/src/utils.c                     | 100 +++++++++------
 tools/tracing/rtla/src/utils.h                     |  10 +-
 tools/tracing/rtla/tests/bpf/bpf_action_map.c      |  25 ++++
 tools/tracing/rtla/tests/engine.sh                 |   1 -
 tools/tracing/rtla/tests/timerlat.t                |  15 +++
 26 files changed, 507 insertions(+), 356 deletions(-)
 create mode 100644 tools/tracing/rtla/example/timerlat_bpf_action.c
 rename tools/tracing/rtla/{sample => example}/timerlat_load.py (100%)
 create mode 100644 tools/tracing/rtla/tests/bpf/bpf_action_map.c
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