heapprofd: fork model mode-select groundwork

This patch introduces:
 * the flags necessary for heapprofd to start as a "child" for a given
   process.
 * logic to fork-exec heapprofd in malloc hook initialization.

If using the fork model, both the hook & private heapprofd exit without
doing much for now.

On user builds (based on "ro.build.type" sysprop), we always select the
fork model. On userdebug/eng, we consult a secondary sysprop,
"heapprofd.userdebug.mode", and use fork if it's set to "fork".

Aside: note that I'm proposing userdebug mode-selection to be global in
nature (not per-datasource).

Bug: 120185246
Change-Id: I9afbc725a2a626c40a0af358536e001a280e53a9
9 files changed
tree: 83653217b7ce5315d8d15999a247f7912774d61c
  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.gn
  20. codereview.settings
  21. heapprofd.rc
  22. MODULE_LICENSE_APACHE2
  23. NOTICE
  24. OWNERS
  25. perfetto.rc
  26. PRESUBMIT.py
  27. README.chromium
  28. README.md
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.