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gerrit-public.fairphone.software / platform / external / perfetto / 5013971489bcdbdc6ad55a4a974c61c4107d2ce4
commit5013971489bcdbdc6ad55a4a974c61c4107d2ce4[log] [tgz]
authorHector Dearman <hjd@google.com>Fri Feb 23 15:43:41 2018 +0000
committerHector Dearman <hjd@google.com>Mon Feb 26 14:07:37 2018 +0000
tree5a9afa410c675f92f3271df7ee92d5901027748e
parent25b14a4a255135d0bdb8551e502eb606cae829a3 [diff]
ftrace_reader: Add FtraceConfigMuxer

Move the logic for handling enabling/disabling/adjusting ftrace
settings into a new class: FtraceConfigMuxer.

Ftrace is a bunch of globaly modifiable persistent state.
Given a number of FtraceConfig's we need to find the best union of all
the settings to make eveyone happy while also watching out for anybody
messing with the ftrace settings at the same time as us.

Specifically FtraceConfigMuxer takes in a *requested* FtraceConfig
(|RequestConfig|), makes a best effort attempt to modify the ftrace
debugfs files to honor those settings without interupting other perfetto
traces already in progress or other users of ftrace, then returns an
FtraceConfigId representing that config or zero on failure.

To see which settings we actually managed to set you can call |GetConfig|
and when you are finished with a config you can signal that with
|RemoveConfig|.

Bug: 73049510
Change-Id: I774ced0341c29ba8274c08170abbecc922dacb62
12 files changed
tree: 5a9afa410c675f92f3271df7ee92d5901027748e
  1. build_overrides/
  2. buildtools/
  3. debian/
  4. docs/
  5. gn/
  6. include/
  7. infra/
  8. protos/
  9. src/
  10. test/
  11. tools/
  12. .clang-format
  13. .gitignore
  14. .gn
  15. .travis.yml
  16. Android.bp
  17. Android.bp.extras
  18. BUILD.gn
  19. codereview.settings
  20. MODULE_LICENSE_APACHE2
  21. NOTICE
  22. OWNERS
  23. perfetto.rc
  24. PRESUBMIT.py
  25. README.chromium
  26. README.md
README.md

Perfetto - Performance instrumentation and logging for POSIX platforms

This project is meant to be built both as part of the Android tree and from a standalone checkout

For internal docs see this page

Supported platforms

Android is the platform targeted in the first milestones. Right now Linux desktop and OSX are maintained best-effort.

Contributing

This project uses Android AOSP Gerrit for code reviews and uses the Google C++ style. Currently targets -std=c++11.

You can use both git cl upload from Chromium depot tools or Android repo to upload patches.

git cl is quite convenient as it supports code auto-formatting via git cl format.

See https://source.android.com/source/contributing for more details about external contributions and CLA signing.

Build instructions

See docs/build_instructions.md

Running Perfetto

See docs/running_perfetto.md

Continuous integration

Continuous build and test coverage is available at perfetto-ci.appspot.com. Trybots: CLs uploaded to gerrit are automatically submitted to TravisCI within one minute and made available on the CI page above. The relevant code lives in the infra/ directory.

Run tests

On the host (Linux / OSX)

$ tools/ninja -C out/default (tracing_unittests | tracing_benchmarks)
$ out/default/tracing_unittests --gtest_help

On Android

Either connect a device in ADB mode or use the bundled emulator.

To start the emulator:
$ tools/run_android_emulator (arm | arm64) &

To run the tests (either on the emulator or physical device):
$ tools/run_android_test out/default tracing_unittests