commit	f30cd9cd488c3b4aef28c8b8de933079a05fdebb	[log] [tgz]
author	Primiano Tucci <primiano@google.com>	Mon Aug 13 01:53:26 2018 +0200
committer	Primiano Tucci <primiano@google.com>	Sun Aug 12 23:54:13 2018 +0000
tree	78d5bdb35d100c218bfc811582b193ebf9c605a4
parent	aaf21fe17828996827fc3d47a9570cd3c14a746e [diff]

UI: Initial clean up and improvements

See preview @ https://primiano-dot-perfetto-ui.appspot.com

Major changes:
 - Make both the OverviewTimeline and the TimeAxis a pure
   canvas-based panel. This removes the need of a full mithril
   redraw when panning horizontally.
 - Ensure that no mithirl redraws happen when panning horizontally,
   and only canvases are redrawn.
 - Make the effects of selections on the overview timeline be
   visible in real-time on the tracks.
 - Make the zoom logic simpler. Following the mouse pointer
   when zooming is too confusing, especially when using the ADWS
   navigation, where the position of the pointer is irrelevant.

Minor changes:
- Switch all time units to seconds and introduce TimeSpan
  for ranges.
- Compute properly trace duration for both chrome and android
  traces.
- Add a notion of total trace time to the state,
  computed by the controller when loading the trace.
- Move the query for the overview timeline to the controller,
  make it work for both chrome and android traces.
- Centralize all animation frames in the raf scheduler and make
  the Animation class be a client of that.
- Simplify PanAndZoomHandler and introduce acceleration factor for
  long presses.

TBR=hjd

Change-Id: I81bdde5734409c4017a53cc24de33c82db0551f0

34 files changed

tree: 78d5bdb35d100c218bfc811582b193ebf9c605a4

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.
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

Kernel tracing: a daemon that converts Kernel Ftrace events into API-stable protobufs, on device, with low overhead.
I/O tracing
Many new probes coming soon: heap profiling, perf sampling, syscall tracing.

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 Stack

Goals

Perfetto is building the next-gen unified tracing ecosystem for:

Android platform tracing (Systrace)
Chrome platform tracing (chrome://tracing)
App-defined user-space tracing (including support for non-Android apps).

The goal is to create an open, portable and developer friendly tracing ecosystem for app and platform performance debugging.

Key features

Designed for production
Perfetto's tracing library and daemons are designed for use in production. Privilege isolation is a key design goal:

The interface for writing trace events are decoupled from the interface for read-back and control and can be subjected to different ACLs.
Despite being based on shared memory, Perfetto is designed to prevent cross-talk between data sources, even in case of arbitrary code execution (memory is shared point-to-point, memory is never shared between processes).
Perfetto daemons are designed following to the principle of least privilege, in order to allow strong sandboxing (via SELinux on Android).

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.

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.