google/perfetto
Oct 2024 – Apr 2026
14 Months active
Languages Used
PythonSQLBPC++ProtoShellTypeScriptGN
Technical Skills
Performance OptimizationPythonSQLTrace AnalysisBuild System ConfigurationC++ Development
Zimuzo Ezeozue
PROFILE
Zimuzo Ezeozue
Zeze Ozue developed advanced performance analysis and visualization features for the google/perfetto repository over 14 months, focusing on Android profiling, memory analysis, and trace data export. They engineered enhancements such as SVG-based timeline visualizations, privacy-safe string interning, and detailed heap profiling, using C++, TypeScript, and SQL. Zeze improved trace processing pipelines, optimized data parsing for large HPROF files, and integrated D3.js for interactive dashboards. Their work included robust backend logic, UI improvements, and cross-language integration, addressing both reliability and scalability. These contributions enabled more accurate diagnostics, efficient debugging, and scalable analytics for Android workloads, demonstrating strong technical depth and maintainability.
Overall Statistics
Feature vs Bugs
83%Features
Repository Contributions
65Total
Bugs
5
Commits
65
Features
25
Lines of code
22,476
Activity Months14
Your Network
4625 peopleSame Organization
@google.com4392
Benedict OdaiMember
Craig IngramMember
KayyuriMember
Scott SuarezMember
Agent2Agent (A2A) BotMember
Andreas AbelMember
Aadi KapurMember
Aadish GoelMember
Aahil MehtaMember
Shared Repositories
233
Work History
April 2026
1 Commits • 1 Features
Apr 1, 2026April 2026 monthly summary focused on delivering a new Android Logs breakdown feature and enhancing log analysis capabilities in Perfetto. Delivered per-process and per-thread tracking under the existing Android logs summary track, with area selection support and per-process heatmap headers to improve trace readability and debugging efficiency. This work enables faster identification of performance issues across processes and threads in large traces. Commit 7345aad2f382c4083527c6b58a92440ed736612f documents the changes and UI updates.
1 Commits • 1 Features
Apr 1, 2026April 2026 monthly summary focused on delivering a new Android Logs breakdown feature and enhancing log analysis capabilities in Perfetto. Delivered per-process and per-thread tracking under the existing Android logs summary track, with area selection support and per-process heatmap headers to improve trace readability and debugging efficiency. This work enables faster identification of performance issues across processes and threads in large traces. Commit 7345aad2f382c4083527c6b58a92440ed736612f documents the changes and UI updates.
April 2026
March 2026
11 Commits • 3 Features
Mar 1, 2026March 2026 monthly summary for google/perfetto development focused on memory analysis and heap inspection improvements. The team delivered parity-aligned HPROF support with Perfetto, enhanced the HeapDump Explorer UX, and established CI for BigTrace UI builds, delivering tangible business value through improved analysis accuracy, faster debugging workflows, and streamlined PR validation.
March 2026
11 Commits • 3 Features
Mar 1, 2026March 2026 monthly summary for google/perfetto development focused on memory analysis and heap inspection improvements. The team delivered parity-aligned HPROF support with Perfetto, enhanced the HeapDump Explorer UX, and established CI for BigTrace UI builds, delivering tangible business value through improved analysis accuracy, faster debugging workflows, and streamlined PR validation.
February 2026
9 Commits • 1 Features
Feb 1, 2026February 2026: Implemented a cohesive Android Perfetto SDK upgrade focused on enhanced event tracking and diagnostics, delivering richer observability, improved production readiness, and easier debugging. Key features include AndroidTrackEvents for process lifecycle events (start, death, state changes, broadcasts, freezer transitions), a binder-died event for early lifecycle reporting, and sequence IDs for process state changes. Stack/callstack handling was optimized with a builder pattern to attach additional protos and support for passing cached stacks, plus UI-oriented improvements through explicit enums and debugging aids. Added local debugging support via emitDebugCallStack and resolved proto enum patterns for maintainability and javastream alignment. These changes improve TraceProcessor correlation, PID reuse detection, and overall performance visibility.
9 Commits • 1 Features
Feb 1, 2026February 2026: Implemented a cohesive Android Perfetto SDK upgrade focused on enhanced event tracking and diagnostics, delivering richer observability, improved production readiness, and easier debugging. Key features include AndroidTrackEvents for process lifecycle events (start, death, state changes, broadcasts, freezer transitions), a binder-died event for early lifecycle reporting, and sequence IDs for process state changes. Stack/callstack handling was optimized with a builder pattern to attach additional protos and support for passing cached stacks, plus UI-oriented improvements through explicit enums and debugging aids. Added local debugging support via emitDebugCallStack and resolved proto enum patterns for maintainability and javastream alignment. These changes improve TraceProcessor correlation, PID reuse detection, and overall performance visibility.
February 2026
January 2026
3 Commits • 3 Features
Jan 1, 2026Performance review month: 2026-01 for google/perfetto focused on expanding memory profiling insights, broadening trace format support, and accelerating interval-time analyses to scale with larger traces. Delivered three major features with concrete user value, improved reliability with tests, and demonstrated strong cross-cutting technical skills across data processing, UI, SQL, and parser layers. Overall impact: richer diagnostics, faster trace processing, and a foundation for scalable analytics.
January 2026
3 Commits • 3 Features
Jan 1, 2026Performance review month: 2026-01 for google/perfetto focused on expanding memory profiling insights, broadening trace format support, and accelerating interval-time analyses to scale with larger traces. Delivered three major features with concrete user value, improved reliability with tests, and demonstrated strong cross-cutting technical skills across data processing, UI, SQL, and parser layers. Overall impact: richer diagnostics, faster trace processing, and a foundation for scalable analytics.
December 2025
3 Commits • 1 Features
Dec 1, 2025December 2025 monthly summary for google/perfetto. Focused on introducing privacy-safe string interning for event arguments via InternedData, starting with AndroidJobName. Implemented proto updates, C ABI changes, and Java SDK exposure to enable app-controlled strings with improved privacy and efficiency. The feature was subsequently relanded to broaden ABI exposure, but a crash caused by improper handling of FieldString types necessitated reverting the feature to preserve stability. This work establishes groundwork for privacy-preserving data handling with potential performance benefits and demonstrates strong cross-language integration, testing discipline, and rollback readiness. Key engineering activities included proto/ABI/SDK changes, JNI exposure, cross-language coordination, and Bazel-based testing within CI workflows.
3 Commits • 1 Features
Dec 1, 2025December 2025 monthly summary for google/perfetto. Focused on introducing privacy-safe string interning for event arguments via InternedData, starting with AndroidJobName. Implemented proto updates, C ABI changes, and Java SDK exposure to enable app-controlled strings with improved privacy and efficiency. The feature was subsequently relanded to broaden ABI exposure, but a crash caused by improper handling of FieldString types necessitated reverting the feature to preserve stability. This work establishes groundwork for privacy-preserving data handling with potential performance benefits and demonstrates strong cross-language integration, testing discipline, and rollback readiness. Key engineering activities included proto/ABI/SDK changes, JNI exposure, cross-language coordination, and Bazel-based testing within CI workflows.
December 2025
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.
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.
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.
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
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.
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.
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.
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
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.
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.
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.
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
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.
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.
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.
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
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.
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.
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Quality Metrics
Correctness92.0%
Maintainability88.4%
Architecture88.4%
Performance84.2%
AI Usage24.6%
Skills & Technologies
Programming Languages
BPBashC++GNJavaJavaScriptProtoProtoBufPythonSCSS
Technical Skills
Android DevelopmentAndroid SDKAndroid developmentBackend DevelopmentBuild System ConfigurationC++C++ DevelopmentC++ ProgrammingC++ developmentCI/CDCode RefactoringCommand-line toolsData EngineeringData ParsingData Visualization
Repositories Contributed To
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