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fuchsia/third_party/github.com/google/perfetto/refs/heads/upstream/dev/zezeozue/d3-decl
commit
11199315dd5b2839ae392df4191c21e8304dd81e
[log]
author
Zimuzo Ezeozue <zezeozue@google.com>
Mon Feb 09 15:54:56 2026 +0000
committer
Zimuzo Ezeozue <zezeozue@google.com>
Tue Feb 10 10:19:14 2026 +0000
tree
e491ae04bf0091addf87cb97ed2ccac8da9f71d6
parent
1f512c9800ce50e8aa7f12aa0961aa2f8569a4ea [diff]
ui: Declarative D3 charting components

Features:
- 4 chart types: histogram, bar (simple/grouped/stacked), CDF, scatter
- Stateless, Mithril-native components with loader pattern
- Interactive brush selection for data filtering
- Cross-chart filtering with Filter coordination
- In-memory data loaders with SQL support foundation
- Configurable axis and legend rendering
- Correlation coefficient display for scatter plots

Architecture:
- Loaders handle data preparation and transformation
- Chart components remain stateless for Mithril compatibility
- BrushHandler provides reusable brush interaction logic
- AxisRenderer and LegendRenderer provide shared rendering utilities
- FilterUtils enables cross-chart filter synchronization
- ChartUtils provides color schemes and layout calculations

Components:
- Histogram with configurable bucket count and brush selection
- SimpleBarChart for basic categorical data visualization
- GroupedBarChart for side-by-side category comparisons
- StackedBarChart for cumulative category visualization
- CDFChart with multi-series support and color grouping
- ScatterPlot with correlation analysis and interactive selection

Plugin:
- DeclarativeChartsPage for exploring chart components
- WidgetsPage integration with d3_decl_charts_demo
- Interactive demo with filter synchronization between charts and tables

Test: Manual
Change-Id: I144b0763c66eb49322f656321499cf221b83d230
35 files changed
tree: e491ae04bf0091addf87cb97ed2ccac8da9f71d6
  1. .github/
  2. bazel/
  3. build_overrides/
  4. buildtools/
  5. contrib/
  6. docs/
  7. examples/
  8. gn/
  9. include/
  10. infra/
  11. protos/
  12. python/
  13. src/
  14. test/
  15. third_party/
  16. tools/
  17. ui/
  18. CLAUDE.md ⇨ docs/AGENTS.md
  19. GEMINI.md ⇨ docs/AGENTS.md
  20. .bazelignore
  21. .bazelrc
  22. .bazelversion
  23. .clang-format
  24. .clang-tidy
  25. .git-blame-ignore-revs
  26. .gitallowed
  27. .gitattributes
  28. .gitignore
  29. .gn
  30. .style.yapf
  31. Android.bp
  32. Android.bp.extras
  33. BUILD
  34. BUILD.extras
  35. BUILD.gn
  36. CHANGELOG
  37. CONTRIBUTORS.txt
  38. DIR_METADATA
  39. heapprofd.rc
  40. LICENSE
  41. meson.build
  42. METADATA
  43. MODULE.bazel
  44. MODULE.bazel.lock
  45. MODULE_LICENSE_APACHE2
  46. OWNERS
  47. OWNERS.github
  48. perfetto.rc
  49. perfetto_flags.aconfig
  50. PerfettoIntegrationTests.xml
  51. persistent_cfg.pbtxt
  52. README.chromium
  53. README.md
  54. TEST_MAPPING
  55. traced_perf.rc
  56. WORKSPACE
README.md

Perfetto - System profiling, app tracing and trace analysis

Perfetto is an open-source suite of SDKs, daemons and tools which use tracing to help developers understand the behaviour of complex systems and root-cause functional and performance issues on client and embedded systems.

It is a production-grade tool that is the default tracing system for the Android operating system and the Chromium browser.

Core Components

Perfetto is not a single tool, but a collection of components that work together:

  • High-performance tracing daemons: For capturing tracing information from many processes on a single machine into a unified trace file.
  • Low-overhead tracing SDK: A C++17 library for direct userspace-to-userspace tracing of timings and state changes in your application.
  • Extensive OS-level probes: For capturing system-wide context on Android and Linux (e.g. scheduling states, CPU frequencies, memory profiling, callstack sampling).
  • Browser-based UI: A powerful, fully local UI for visualizing and exploring large, multi-GB traces on a timeline. It works in all major browsers, requires no installation, and can open traces from other tools.
  • SQL-based analysis library: A powerful engine that allows you to programmatically query traces using SQL to automate analysis and extract custom metrics.

Why Use Perfetto?

Perfetto was designed to be a versatile and powerful tracing system for a wide range of use cases.

  • For Android App & Platform Developers: Debug and root-cause functional and performance issues like slow startups, dropped frames (jank), animation glitches, low memory kills, and ANRs. Profile both Java/Kotlin and native C++ memory usage with heap dumps and profiles.
  • For C/C++ Developers (Linux, macOS, Windows): Use the Tracing SDK to instrument your application with custom trace points to understand its execution flow, find performance bottlenecks, and debug complex behavior. On Linux, you can also perform detailed CPU and native heap profiling.
  • For Linux Kernel & System Developers: Get deep insights into kernel behavior. Perfetto acts as an efficient userspace daemon for ftrace, allowing you to visualize scheduling, syscalls, interrupts, and custom kernel tracepoints on a timeline.
  • For Chromium Developers: Perfetto is the tracing backend for chrome://tracing. Use it to debug and root-cause issues in the browser, V8, and Blink.
  • For Performance Engineers & SREs: Analyze and visualize a wide range of profiling and tracing formats, not just Perfetto's. Use the powerful SQL interface to programmatically analyze traces from tools like Linux perf, macOS Instruments, Chrome JSON traces, and more.

Getting Started

We‘ve designed our documentation to guide you to the right information as quickly as possible, whether you’re a newcomer to performance analysis or an experienced developer.

  1. New to tracing? If you're unfamiliar with concepts like tracing and profiling, start here:

  2. Ready to dive in? Our “Getting Started” guide is the main entry point for all users. It will help you find the right tutorials and documentation for your specific needs:

  3. Want the full overview? For a comprehensive look at what Perfetto is, why it's useful, and who uses it, see our main documentation page:

Debian Distribution

For users interested in the Debian distribution of Perfetto, the official source of truth and packaging efforts are maintained at Debian Perfetto Salsa Repository

Community & Support

Have questions? Need help?

We follow Google's Open Source Community Guidelines.