commit | 4274a38d629f5190ef2a2f13c67dd5072d8a1b1f | [log] [tgz] |
---|---|---|
author | Hector Dearman <hjd@google.com> | Wed Jul 18 16:14:10 2018 +0100 |
committer | Hector Dearman <hjd@google.com> | Wed Jul 18 15:15:19 2018 +0000 |
tree | 82d01195a36146ae0d17a02d5e836505d2f9be80 | |
parent | 510bbe089b53f4cb281805670ff7586f2aec2e86 [diff] |
perfetto-ui: Increase correctness of build Adding typescript files to inputs means that after removing a typescript file the build fails until gn gen is rerun with an error like: ninja: error: '../../ui/src/foo.ts', needed by 'obj/ui/controller/index.js', missing and no known rule to make it Using depfile is the more correct thing here since depfiles mentioning files that do not exist is not an error. Neither this CL (nor the previous state) address the situation of adding a new typescript file - this doesn't error but changes to the new file won't automatically cause rebuilds until gn gen is run. This is because we generate the dependency list too early, at the gn time instead of at buildtime. The real fix for is to have tsc (or a wrapper) create the depfile. Change-Id: I784e9623fd13491a08ecc9ddd65826d17800e22c
Perfetto is an open-source project for performance instrumentation and tracing of Linux/Android/Chrome platforms and user-space apps.
It consists of:
A portable, high efficiency, user-space tracing library
designed for tracing of multi-process systems, based on zero-alloc zero-copy zero-syscall (on fast-paths) writing of protobufs over shared memory.
OS-wide Linux/Android probes for platform debugging
Web-based frontend
A UI for inspection and analysis of traces (coming soon).
Batch processing of traces
A python / C++ (TBD) library for trace-based metrics (coming soon).
Perfetto is building the next-gen unified tracing ecosystem for:
The goal is to create an open, portable and developer friendly tracing ecosystem for app and platform performance debugging.
Designed for production
Perfetto's tracing library and daemons are designed for use in production. Privilege isolation is a key design goal:
See docs/security-model.md for more details.
Long traces
Pefetto aims at supporting hours-long / O(100GB) traces, both in terms of recording backend and UI frontend.
Interoperability
Perfetto traces (output) and configuration (input) consists of protobuf messages, in order to allow interoperability with several languages.
See docs/trace-format.md for more details.
Composability
As Perfetto is designed both for OS-level tracing and app-level tracing, its design allows to compose several instances of the Perfetto tracing library, allowing to nest multiple layers of tracing and drive then with the same frontend. This allows powerful blending of app-specific and OS-wide trace events. See docs/multi-layer-tracing.md for more details.
Portability
The only dependencies of Perfetto's tracing libraries are C++11 and Protobuf lite (plus google-test, google-benchmark, libprotobuf-full for testing).
Extensibility
Perfetto allows third parties to defined their own protobufs for:
Allowing apps to define their own strongly-typed input and output schema. See docs/trace-format.md for more details.