google/perfetto
Oct 2024 – Oct 2025
9 Months active
Languages Used
PythonSQLBPC++ProtoShellTypeScriptGN
Technical Skills
Performance OptimizationPythonSQLTrace AnalysisBuild System ConfigurationC++ Development
Zimuzo Ezeozue
PROFILE
Zimuzo Ezeozue
Zeze Ozue contributed to the google/perfetto repository by building advanced performance analysis and visualization features for Android workloads. Over nine months, Zeze engineered trace data export pipelines, modular SVG generation, and D3-based chart integration, enabling interactive dashboards and improved trace analysis. Their work included robust HPROF parsing in C++ for scalable heap profiling, SQL-based data transformation for SVG exports, and TypeScript-driven frontend enhancements. Zeze’s technical approach emphasized maintainability, composability, and data fidelity, addressing edge cases in parsing and visualization. The depth of engineering is reflected in cross-stack improvements, from backend data processing to frontend UI, supporting reliable performance insights.
Overall Statistics
Feature vs Bugs
80%Features
Repository Contributions
38Total
Bugs
4
Commits
38
Features
16
Lines of code
9,220
Activity Months9
Your Network
4376 people
Work History
October 2025
1 Commits • 1 Features
Oct 1, 2025Month: 2025-10 – Key features delivered: BigTrace Visualization: D3 Library Integration; Added D3 library and type definitions to project dependencies to support building D3-based chart widgets for the BigTrace UI (commit 855c2d408b13430a2e0a05218b431acc58798610). Major bugs fixed: No major bugs fixed this month (no bug-fix commits recorded in the provided data). Overall impact and accomplishments: Established frontend groundwork for richer performance dashboards, enabling more expressive visual analysis and faster issue detection, which enhances user decision making. Technologies/skills demonstrated: D3.js integration, TypeScript typings, frontend dependency management, UI widget development.
1 Commits • 1 Features
Oct 1, 2025Month: 2025-10 – Key features delivered: BigTrace Visualization: D3 Library Integration; Added D3 library and type definitions to project dependencies to support building D3-based chart widgets for the BigTrace UI (commit 855c2d408b13430a2e0a05218b431acc58798610). Major bugs fixed: No major bugs fixed this month (no bug-fix commits recorded in the provided data). Overall impact and accomplishments: Established frontend groundwork for richer performance dashboards, enabling more expressive visual analysis and faster issue detection, which enhances user decision making. Technologies/skills demonstrated: D3.js integration, TypeScript typings, frontend dependency management, UI widget development.
October 2025
September 2025
2 Commits • 1 Features
Sep 1, 2025Performance-focused month for google/perfetto: introduced flexible SVG counter scaling and stabilized SVG generation. Delivered user-visible visualization improvements and code-quality improvements through SQL refactor.
September 2025
2 Commits • 1 Features
Sep 1, 2025Performance-focused month for google/perfetto: introduced flexible SVG counter scaling and stabilized SVG generation. Delivered user-visible visualization improvements and code-quality improvements through SQL refactor.
August 2025
3 Commits • 1 Features
Aug 1, 2025Aug 2025 monthly summary focusing on SVG export enhancements and label rendering stabilizations in google/perfetto. Delivered a modular, composable SVG generation pipeline with improved counter track visuals, large-number formatting, SVG path-based rendering, and axis labeling, enabling clearer performance visualizations. Fixed label rendering by replacing incompatible string casts in to_svg.sql (cast_string!()), resolving rendering issues across dashboards. These changes reduce maintenance risk, improve developer experience for trace analysis, and lay groundwork for future performance metric visualizations.
3 Commits • 1 Features
Aug 1, 2025Aug 2025 monthly summary focusing on SVG export enhancements and label rendering stabilizations in google/perfetto. Delivered a modular, composable SVG generation pipeline with improved counter track visuals, large-number formatting, SVG path-based rendering, and axis labeling, enabling clearer performance visualizations. Fixed label rendering by replacing incompatible string casts in to_svg.sql (cast_string!()), resolving rendering issues across dashboards. These changes reduce maintenance risk, improve developer experience for trace analysis, and lay groundwork for future performance metric visualizations.
August 2025
June 2025
1 Commits • 1 Features
Jun 1, 2025June 2025 performance summary for google/perfetto: Delivered Trace Data SVG Export and Interactive Timeline Visualization. Implemented an exporter that exports trace data (thread slices and states) to SVG and established a pipeline to convert raw interval data into visual SVG elements with positioning, scaling, and styling for interactive timelines. This work improves data portability, enables visualization in dashboards, and strengthens troubleshooting workflows. No major bugs fixed this month; focus was on delivering the feature and ensuring clean integration with the tracing stack. Technologies demonstrated include C++, SVG rendering, data transformation pipelines, algorithmic layout, and collaboration through code reviews.
June 2025
1 Commits • 1 Features
Jun 1, 2025June 2025 performance summary for google/perfetto: Delivered Trace Data SVG Export and Interactive Timeline Visualization. Implemented an exporter that exports trace data (thread slices and states) to SVG and established a pipeline to convert raw interval data into visual SVG elements with positioning, scaling, and styling for interactive timelines. This work improves data portability, enables visualization in dashboards, and strengthens troubleshooting workflows. No major bugs fixed this month; focus was on delivering the feature and ensuring clean integration with the tracing stack. Technologies demonstrated include C++, SVG rendering, data transformation pipelines, algorithmic layout, and collaboration through code reviews.
May 2025
4 Commits • 2 Features
May 1, 2025May 2025 monthly performance summary for google/perfetto focused on ART HPROF support and HPROF parsing improvements in Trace Processor.
4 Commits • 2 Features
May 1, 2025May 2025 monthly performance summary for google/perfetto focused on ART HPROF support and HPROF parsing improvements in Trace Processor.
May 2025
March 2025
16 Commits • 2 Features
Mar 1, 2025March 2025 performance summary for google/perfetto: Delivered substantial feature enhancements and reliability improvements across Android Binder tracing, heap/flamegraph visualization, and data parsing. Binder tracing received a reason_type breakdown and improved transaction display, with stability fixes that unblock the binder plugin and prevent crashes. Heap/flamegraph tooling gained disaggregated heap dumps, expanded flamegraph options including dominator-tree and root-level menus, a new memory-mapping data source, and general UI/perf optimizations. A parsing robustness improvement fixed SQL value handling by introducing a toSqlValue-based approach, preventing data-type errors from numeric strings and BigInts. These changes improved data fidelity, reduced troubleshooting time, and enhanced profiling capabilities for Android workloads.
March 2025
16 Commits • 2 Features
Mar 1, 2025March 2025 performance summary for google/perfetto: Delivered substantial feature enhancements and reliability improvements across Android Binder tracing, heap/flamegraph visualization, and data parsing. Binder tracing received a reason_type breakdown and improved transaction display, with stability fixes that unblock the binder plugin and prevent crashes. Heap/flamegraph tooling gained disaggregated heap dumps, expanded flamegraph options including dominator-tree and root-level menus, a new memory-mapping data source, and general UI/perf optimizations. A parsing robustness improvement fixed SQL value handling by introducing a toSqlValue-based approach, preventing data-type errors from numeric strings and BigInts. These changes improved data fidelity, reduced troubleshooting time, and enhanced profiling capabilities for Android workloads.
February 2025
3 Commits • 3 Features
Feb 1, 2025February 2025 — google/perfetto: Delivered focused observability, documentation, and UX improvements that enhance Android performance analysis and profiling workflows. Implemented Android Message Queue Tracing: new tracing events in android_track_event with protobuf fields for thread names, message codes, and delays to enable granular analysis of message queue operations. Updated Heap Profiling Documentation: clarified --heaps usage and recommended profiling with com.android.art and libc.malloc to ensure accurate heap insights. UI cleanup in thread state panel: removed the slow 'Critical path' button to reduce rendering overhead, while preserving 'Critical path lite' and full functionality via the command palette.
3 Commits • 3 Features
Feb 1, 2025February 2025 — google/perfetto: Delivered focused observability, documentation, and UX improvements that enhance Android performance analysis and profiling workflows. Implemented Android Message Queue Tracing: new tracing events in android_track_event with protobuf fields for thread names, message codes, and delays to enable granular analysis of message queue operations. Updated Heap Profiling Documentation: clarified --heaps usage and recommended profiling with com.android.art and libc.malloc to ensure accurate heap insights. UI cleanup in thread state panel: removed the slow 'Critical path' button to reduce rendering overhead, while preserving 'Critical path lite' and full functionality via the command palette.
February 2025
December 2024
6 Commits • 4 Features
Dec 1, 2024December 2024 performance summary for google/perfetto: Four major telemetry/analytics enhancements delivered to improve data integrity, visibility, and performance analysis. Android broadcast telemetry was enriched with record_id and process_queue_id and corresponding tests; a new pixel.camera module with pixel_camera_frames table was added to break down camera graph execution slices by node, port group, and frame, with build/config updates; Android Binder Transactions analytics gained a granular interface column and a client/server latency breakdown table, with tests; systrace parser now tracks thread identifiers in atrace counter events and includes utid/end_utid in async trace events for richer thread-level performance insights. These changes are supported by targeted commits and updated test coverage, enabling more reliable reporting and faster debugging across Android workloads.
December 2024
6 Commits • 4 Features
Dec 1, 2024December 2024 performance summary for google/perfetto: Four major telemetry/analytics enhancements delivered to improve data integrity, visibility, and performance analysis. Android broadcast telemetry was enriched with record_id and process_queue_id and corresponding tests; a new pixel.camera module with pixel_camera_frames table was added to break down camera graph execution slices by node, port group, and frame, with build/config updates; Android Binder Transactions analytics gained a granular interface column and a client/server latency breakdown table, with tests; systrace parser now tracks thread identifiers in atrace counter events and includes utid/end_utid in async trace events for richer thread-level performance insights. These changes are supported by targeted commits and updated test coverage, enabling more reliable reporting and faster debugging across Android workloads.
October 2024
2 Commits • 1 Features
Oct 1, 2024October 2024 monthly summary for google/perfetto focused on Android startup analytics enhancements and performance improvements. Delivered a new startup insight metric and optimized data processing, while addressing an optimization bottleneck in the startup_breakdown module to improve reliability and efficiency for profiling Android startup latency.
2 Commits • 1 Features
Oct 1, 2024October 2024 monthly summary for google/perfetto focused on Android startup analytics enhancements and performance improvements. Delivered a new startup insight metric and optimized data processing, while addressing an optimization bottleneck in the startup_breakdown module to improve reliability and efficiency for profiling Android startup latency.
October 2024
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Quality Metrics
Correctness92.6%
Maintainability92.2%
Architecture89.2%
Performance84.4%
AI Usage20.0%
Skills & Technologies
Programming Languages
BPC++GNJavaScriptProtoPythonSQLShellTypeScriptc++
Technical Skills
Android DevelopmentBackend DevelopmentBuild System ConfigurationC++C++ DevelopmentCode RefactoringCommand-line toolsData EngineeringData ParsingData VisualizationDatabaseDatabase Schema DesignDebuggingDocumentationFile Parsing
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