tracing: Use process start time as unique identifier

Use the process start time hashed with the process id as the unique
identifier for a process. This ensures that if there are two independent
copies of the Perfetto SDK in the same process (e.g., one in the app and
another in a system framework), events emitted by each will be
consistently interleaved on common thread and process tracks.

Bug: b/178314761
Change-Id: Icccfd6813da6ed8bf9a6d8fbf9c41d964b65b5fb
2 files changed
tree: 892ab318bf08e036c8fa6c51418199f543e85910
  1. .github/
  2. bazel/
  3. build_overrides/
  4. buildtools/
  5. debian/
  6. docs/
  7. examples/
  8. gn/
  9. include/
  10. infra/
  11. protos/
  12. src/
  13. test/
  14. tools/
  15. ui/
  16. .clang-format
  17. .clang-tidy
  18. .gitattributes
  19. .gitignore
  20. .gn
  21. .style.yapf
  22. Android.bp
  23. Android.bp.extras
  24. BUILD
  25. BUILD.extras
  26. BUILD.gn
  27. CHANGELOG
  28. codereview.settings
  29. DIR_METADATA
  30. heapprofd.rc
  31. LICENSE
  32. METADATA
  33. MODULE_LICENSE_APACHE2
  34. OWNERS
  35. perfetto.rc
  36. PerfettoIntegrationTests.xml
  37. PRESUBMIT.py
  38. README.chromium
  39. README.md
  40. TEST_MAPPING
  41. traced_perf.rc
  42. WORKSPACE
README.md

Perfetto - System profiling, app tracing and trace analysis

Perfetto is a production-grade open-source stack for performance instrumentation and trace analysis. It offers services and libraries and for recording system-level and app-level traces, native + java heap profiling, a library for analyzing traces using SQL and a web-based UI to visualize and explore multi-GB traces.

See https://perfetto.dev/docs or the /docs/ directory for documentation.