| commit | fb0df370034487da05c9530575924b06b62f3dcb | [log] [tgz] |
|---|---|---|
| author | Hector Dearman <hjd@google.com> | Fri Dec 15 14:12:00 2017 +0000 |
| committer | Hector Dearman <hjd@google.com> | Fri Dec 15 14:12:00 2017 +0000 |
| tree | bc4da11d69bd760628d3f48e8a3cc09ca5f1d63f | |
| parent | 77af1339a9fb654ed0e54c12c0448073e54d3279 [diff] |
ftrace_reader: Add dynamic parser (part 5/5) In the fifth and final part of this change we start inferring the ftrace types from the types listed in the format files. This makes us robust against changes to the width of fields in the raw binary format. To summarise the overall state after this CL: - We have auto-generated protos for a small number ftrace events. These live in protos/ftrace/ - We hardcoded information (proto field ids, proto field types, and the name of the field in the ftrace format files) about these protos into event_info.cc where we can read it at runtime. - We combine this information with information (field size, field offset) acquired at initialization to build a ProtoTranslationTable. - We use this table to parse the raw trace buffer in cpu_reader. We are robust against the following kinds of changes: The version of Linux we happen to be running on: - has new fields (we ignore them) - has missing fields, compared to the proto (we ignore them) - has a field who's offset has changed (transparent to consumer) - has a field who's size has changed (consumer will cast) - has a field who's type has changed (we ignore it) - the fields have been reordered (transparent to consumer) Bug: 70328826 Change-Id: I8b3442bf1da9305909b9977a656d9f29b631ccf4
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
Android is the platform targeted in the first milestones. Right now Linux desktop and OSX are maintained best-effort.
All dependent libraries are self-hosted and pulled by the tools/install-build-deps script.
The only requirements on the host are python, git and a compiler (preferably clang, gcc is maintained best-effort):$ sudo apt-get update && sudo apt-get install git clang python
Then:$ git clone https://android.googlesource.com/platform/external/perfetto.git
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.
If you are a chromium developer and have depot_tools installed you can avoid the tools/ prefix below and just use gn/ninja from depot_tools.
$ tools/install-build-deps to install third-party build deps (NDK etc)
$ tools/gn args out/android to generate build files and enter in the editor:
target_os = "android" # Leave empty for local testing target_cpu = "arm" or "arm64" # Only when building for Android
(See the Build Configurations section below for more)
$ tools/ninja -C out/android all
TODO. The plan is to autogenerate the Android.bp build files from the master GN build files (or temporarily maintain both until we can autogenerate them).
$ tools/ninja -C out/default (tracing_unittests | tracing_benchmarks) $ out/default/tracing_unittests --gtest_help
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
The following GN args are supported:
target_os = "android" | "linux" | "mac":
Defaults to the current host, set “android” to build for Android.
target_cpu = "arm" | "arm64" | "x86" | "x64":
Defaults to "arm" when target_os == "android", "x64" when targeting the host. 32-bit host builds are not supported.
is_debug = true | false:
Toggles Debug (default) / Release mode.
is_clang = true | false:
Use Clang (default) / GCC. It requires clang 3.5+ to be installed on the host. Clang is the default compiler on Mac (% having installed Xcode). On Linux: sudo apt-get update && sudo apt-get install clang
cc = "gcc" / cxx = "g++":
Uses a different compiler binary (default: autodetected depending on is_clang).
is_asan = true:
Enables Address Sanitizer
is_lsan = true:
Enables Leak Sanitizer
(Linux/Mac only)
is_msan = true:
Enables Memory Sanitizer
(Linux only)
is_tsan = true:
Enables Thread Sanitizer
(Linux/Mac only)
is_ubsan = true:
Enables Undefined Behavior Sanitizer