google/perfetto
Apr 2025 – Sep 2025
6 Months active
Languages Used
TypeScriptc++protobufC++JavaScriptProtoPython
Technical Skills
Code RefactoringDebuggingProtocol BuffersSystem InternalsTrace ProcessingAPI Integration
Etienne Pierre-doray
PROFILE
Etienne Pierre-doray
Etienne worked on the google/perfetto repository, delivering a range of tracing and performance analysis features over six months. He enhanced the TrackEvent system with configurable thread time subsampling and dynamic event naming, improving data fidelity and reducing overhead. Using C++, Protocol Buffers, and TypeScript, Etienne implemented privacy-focused APIs, robust ETW integration, and JSON metadata export, aligning with evolving platform requirements. His work included refactoring trace processing, strengthening test coverage, and addressing subtle bugs in event tagging and data handling. These contributions deepened Perfetto’s configurability and reliability, supporting more accurate performance analysis and streamlined integration across Chrome and Windows environments.
Overall Statistics
Feature vs Bugs
67%Features
Repository Contributions
24Total
Bugs
6
Commits
24
Features
12
Lines of code
1,213
Activity Months6
Your Network
537 people
Work History
September 2025
1 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary for google/perfetto. Focused on performance optimization and configurability in tracing. Delivered Perfetto TrackEvent: Thread Time Subsampling feature, introducing a new configuration option to subsample thread time recording based on a minimum elapsed wall time, reducing tracing overhead and enabling configurable behavior. Updated event writing to honor the subsampling setting. All changes landed in a single commit 620b29ac8344431d2b51c3895888bccd48b9896a (PR #2737).
1 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary for google/perfetto. Focused on performance optimization and configurability in tracing. Delivered Perfetto TrackEvent: Thread Time Subsampling feature, introducing a new configuration option to subsample thread time recording based on a minimum elapsed wall time, reducing tracing overhead and enabling configurable behavior. Updated event writing to honor the subsampling setting. All changes landed in a single commit 620b29ac8344431d2b51c3895888bccd48b9896a (PR #2737).
September 2025
August 2025
8 Commits • 4 Features
Aug 1, 20252025-08 Monthly summary for google/perfetto focusing on delivering high-impact features, stabilizing tracing, and aligning with platform-specific requirements. Highlights include privacy-first enhancements, Windows ETW integration, and multi-session support, backed by targeted bug fixes and robust test coverage.
August 2025
8 Commits • 4 Features
Aug 1, 20252025-08 Monthly summary for google/perfetto focusing on delivering high-impact features, stabilizing tracing, and aligning with platform-specific requirements. Highlights include privacy-first enhancements, Windows ETW integration, and multi-session support, backed by targeted bug fixes and robust test coverage.
July 2025
3 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for google/perfetto: Delivered a standardized explicit slow tagging policy for tracing categories across the project, consolidating usage and removing implicit associations. This policy update enhances API/SDK surfaces, improves documentation accuracy, and aligns client expectations with actual tagging behavior. In parallel, fixed a regression in slow tagging for dynamic performance categories to restore correct tagging for categories with the 'disabled-by-default-' prefix, addressing Chrome autoroll and tagging accuracy issues. The combined work reduces tagging confusion, improves trace reliability, and supports more accurate performance analysis across platforms.
3 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for google/perfetto: Delivered a standardized explicit slow tagging policy for tracing categories across the project, consolidating usage and removing implicit associations. This policy update enhances API/SDK surfaces, improves documentation accuracy, and aligns client expectations with actual tagging behavior. In parallel, fixed a regression in slow tagging for dynamic performance categories to restore correct tagging for categories with the 'disabled-by-default-' prefix, addressing Chrome autoroll and tagging accuracy issues. The combined work reduces tagging confusion, improves trace reliability, and supports more accurate performance analysis across platforms.
July 2025
June 2025
6 Commits • 3 Features
Jun 1, 2025June 2025 performance summary for google/perfetto: Focused on improving observability with TrackEvent system enhancements, ETW data correctness, and JSON-based metadata export. The changes delivered more reliable data pipelines, unified data sources, and improved interoperability with downstream tools. This period also strengthened tracing fidelity and debugging efficiency across ETW-powered workflows.
June 2025
6 Commits • 3 Features
Jun 1, 2025June 2025 performance summary for google/perfetto: Focused on improving observability with TrackEvent system enhancements, ETW data correctness, and JSON-based metadata export. The changes delivered more reliable data pipelines, unified data sources, and improved interoperability with downstream tools. This period also strengthened tracing fidelity and debugging efficiency across ETW-powered workflows.
May 2025
4 Commits • 3 Features
May 1, 2025Month: 2025-05 — Performance-driven monthly summary for google/perfetto focusing on business value and technical accomplishments. Key features delivered include: (1) ChromeConfig: event_package_name_filter_enabled feature introduced to enable filtering of event package names, reducing reliance on trace_config and simplifying event name processing. (2) ScenarioConfig: added optional scenario_description field to provide UI-friendly descriptions for scenarios. (3) TrackEvent API tests: added tests for multiple category configurations (enabled, disabled, tags) to cover upcoming API changes and ensure robustness. Major bug fixed: ETW thread ID privacy fix in trace processor, replacing erased thread IDs with -1 to avoid misinterpretation as idle and ensure accurate trace processing. Overall impact: improves data privacy and accuracy of trace data, enhances UI clarity and API stability, and reduces risk for upcoming changes. Technologies/skills demonstrated: C++, protobuf/config proto changes, trace processing correctness, test automation and coverage, and performance-focused code changes. Business value emphasis: more reliable trace data, safer rollout of API changes, and better developer and user-facing descriptions.
4 Commits • 3 Features
May 1, 2025Month: 2025-05 — Performance-driven monthly summary for google/perfetto focusing on business value and technical accomplishments. Key features delivered include: (1) ChromeConfig: event_package_name_filter_enabled feature introduced to enable filtering of event package names, reducing reliance on trace_config and simplifying event name processing. (2) ScenarioConfig: added optional scenario_description field to provide UI-friendly descriptions for scenarios. (3) TrackEvent API tests: added tests for multiple category configurations (enabled, disabled, tags) to cover upcoming API changes and ensure robustness. Major bug fixed: ETW thread ID privacy fix in trace processor, replacing erased thread IDs with -1 to avoid misinterpretation as idle and ensure accurate trace processing. Overall impact: improves data privacy and accuracy of trace data, enhances UI clarity and API stability, and reduces risk for upcoming changes. Technologies/skills demonstrated: C++, protobuf/config proto changes, trace processing correctness, test automation and coverage, and performance-focused code changes. Business value emphasis: more reliable trace data, safer rollout of API changes, and better developer and user-facing descriptions.
May 2025
April 2025
2 Commits
Apr 1, 2025April 2025 monthly summary for google/perfetto: Focused on reliability and data accuracy in Chrome tracing and ETW processing for Perfetto. Delivered two critical bug fixes that improve histogram data integrity and ETW robustness, resulting in more reliable performance analysis and faster issue resolution across Chrome and Windows pipelines.
April 2025
2 Commits
Apr 1, 2025April 2025 monthly summary for google/perfetto: Focused on reliability and data accuracy in Chrome tracing and ETW processing for Perfetto. Delivered two critical bug fixes that improve histogram data integrity and ETW robustness, resulting in more reliable performance analysis and faster issue resolution across Chrome and Windows pipelines.
Activity
Loading activity data...
Quality Metrics
Correctness93.0%
Maintainability90.0%
Architecture88.8%
Performance83.4%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++JavaScriptProtoPythonTypeScriptc++protobuf
Technical Skills
API DesignAPI DevelopmentAPI IntegrationBug FixingC++Code RefactoringData ExportDebuggingEvent Tracing for Windows (ETW)Event TrackingFull Stack DevelopmentJSONJavaScriptMetadata HandlingPerformance Analysis
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline