trace_processor: add support for JSON metric output

This supports the use-case of consumers who do not want to depend on protobuf to
consume the output of the trace processor. Instead, they can use their
favourite JSON parsing library along with considering the proto schema
to read the metric values.

We implement this dep-free as we want to remove jsoncpp support eventually.

Bug: 139461901
Change-Id: I993feaf80d0af2170fbd85d55be780de9fe2a5d0
9 files changed
tree: 6a5e7b3c48059c92f94c33604b6e3029aa502030
  1. build_overrides/
  2. buildtools/
  3. debian/
  4. docs/
  5. gn/
  6. include/
  7. infra/
  8. protos/
  9. src/
  10. test/
  11. tools/
  12. ui/
  13. .clang-format
  14. .gitignore
  15. .gn
  16. .travis.yml
  17. Android.bp
  18. Android.bp.extras
  19. BUILD
  20. BUILD.extras
  21. BUILD.gn
  22. codereview.settings
  23. heapprofd.rc
  24. MODULE_LICENSE_APACHE2
  25. NOTICE
  26. OWNERS
  27. perfetto.rc
  28. PRESUBMIT.py
  29. README.chromium
  30. README.md
  31. TEST_MAPPING
README.md

Perfetto - Performance instrumentation and tracing

Perfetto is an open-source project for performance instrumentation and tracing of Linux/Android/Chrome platforms and user-space apps.

See www.perfetto.dev for docs.

Bugs

  • For bugs affecting Android or the tracing internals use the internal bug tracker (go/perfetto-bugs).
  • For bugs affecting Chrome use http://crbug.com, Component:Speed>Tracing label:Perfetto.