google/perfetto
Oct 2024 – Feb 2026
9 Months active
Languages Used
JavaprotobufC++ProtoBPGNPythonSQL
Technical Skills
Build System ConfigurationConfiguration ManagementSystem TracingBuild SystemsC++C++ Development
Kean Mariotti
PROFILE
Kean Mariotti
Kean Mariotti contributed to the google/perfetto repository by designing and implementing core tracing, memory management, and observability features across Android and C++ systems. He developed persistent input event tracing, a production-ready slab allocator, and a dynamic Protocol Buffer Virtual Machine, each improving runtime efficiency and configurability. His work included flattening window manager hierarchies for analytics, enhancing multi-user support in input method protos, and optimizing ProtoVM serialization for performance. Using C++, Java, and Protocol Buffers, Kean integrated robust error handling, build system improvements, and unit testing, demonstrating depth in low-level programming and system integration while addressing stability and maintainability.
Overall Statistics
Feature vs Bugs
78%Features
Repository Contributions
23Total
Bugs
4
Commits
23
Features
14
Lines of code
11,958
Activity Months9
Your Network
4618 peopleSame Organization
@google.com4385
Benedict OdaiMember
Craig IngramMember
KayyuriMember
Scott SuarezMember
Agent2Agent (A2A) BotMember
Andreas AbelMember
Aadi KapurMember
Aadish GoelMember
Aahil MehtaMember
Shared Repositories
233
Work History
February 2026
6 Commits • 4 Features
Feb 1, 2026February 2026 (2026-02) monthly summary for google/perfetto focused on cross-stack ProtoVM integration, performance-oriented optimizations, and build reliability improvements. The work advances tracing provenance, configurability, and visualization while delivering tangible performance and stability gains across the tracing stack.
6 Commits • 4 Features
Feb 1, 2026February 2026 (2026-02) monthly summary for google/perfetto focused on cross-stack ProtoVM integration, performance-oriented optimizations, and build reliability improvements. The work advances tracing provenance, configurability, and visualization while delivering tangible performance and stability gains across the tracing stack.
February 2026
December 2025
2 Commits • 1 Features
Dec 1, 2025December 2025: Focused on fine-grained tracing instrumentation and stability for the Perfetto repository. Implemented granular input method tracing configuration and ensured proto-level config is integrated into the build, while restoring javastream protos allowlist entries to fix compatibility. These changes improve diagnostics precision, tracing coverage, and maintainability across Java streams, enabling faster performance analysis and fewer regressions.
December 2025
2 Commits • 1 Features
Dec 1, 2025December 2025: Focused on fine-grained tracing instrumentation and stability for the Perfetto repository. Implemented granular input method tracing configuration and ensured proto-level config is integrated into the build, while restoring javastream protos allowlist entries to fix compatibility. These changes improve diagnostics precision, tracing coverage, and maintainability across Java streams, enabling faster performance analysis and fewer regressions.
November 2025
3 Commits • 2 Features
Nov 1, 2025Monthly summary for 2025-11 focusing on google/perfetto. Deliverables targeted improvements in tracing observability, testability, and data resilience across key components.
3 Commits • 2 Features
Nov 1, 2025Monthly summary for 2025-11 focusing on google/perfetto. Deliverables targeted improvements in tracing observability, testability, and data resilience across key components.
November 2025
September 2025
2 Commits • 1 Features
Sep 1, 2025September 2025 highlights for google/perfetto: Delivered the Intrinsic Window Manager Hierarchy feature by introducing a flattened WindowContainer data model, enabling traversal, element extraction, and computation of visibility and screen positions. Implemented new C++ data-processing components, updated build configurations, and added unit tests to validate hierarchy parsing and analytics. This work enhances window layout debugging, profiling analytics, and aligns with our goals to improve observability and developer productivity across the project.
September 2025
2 Commits • 1 Features
Sep 1, 2025September 2025 highlights for google/perfetto: Delivered the Intrinsic Window Manager Hierarchy feature by introducing a flattened WindowContainer data model, enabling traversal, element extraction, and computation of visibility and screen positions. Implemented new C++ data-processing components, updated build configurations, and added unit tests to validate hierarchy parsing and analytics. This work enhances window layout debugging, profiling analytics, and aligns with our goals to improve observability and developer productivity across the project.
June 2025
4 Commits • 2 Features
Jun 1, 2025June 2025 (2025-06) monthly summary for google/perfetto: Delivered two targeted feature sets that improve multi-user operation safety and telemetry observability. Key changes include InputMethodManagerServiceProto enhancements for multi-user support and startup guard, and observability/instrumentation improvements to surfaceflinger tracing and Perfetto IME protos with Java streaming support. The work was accompanied by refactors to enable safer startup in tests and broader data collection across IME protos, enabling faster debugging and better operational visibility.
4 Commits • 2 Features
Jun 1, 2025June 2025 (2025-06) monthly summary for google/perfetto: Delivered two targeted feature sets that improve multi-user operation safety and telemetry observability. Key changes include InputMethodManagerServiceProto enhancements for multi-user support and startup guard, and observability/instrumentation improvements to surfaceflinger tracing and Perfetto IME protos with Java streaming support. The work was accompanied by refactors to enable safer startup in tests and broader data collection across IME protos, enabling faster debugging and better operational visibility.
June 2025
May 2025
1 Commits • 1 Features
May 1, 2025Month 2025-05 — Production-ready Slab Allocator Refactor for Protovm in google/perfetto. Implemented 4KB slab alignment, hash-map based mapping of blocks to slabs, intrusive lists for O(1) slab access, and automatic deallocation of empty slabs to optimize memory usage. These changes reduce memory fragmentation, stabilize performance under production load, and lower production risk. Commit reference: 10d3010763fc0fe0fca99952bfef0806fa25726c (protovm: slab allocator towards production quality (#1348)).
May 2025
1 Commits • 1 Features
May 1, 2025Month 2025-05 — Production-ready Slab Allocator Refactor for Protovm in google/perfetto. Implemented 4KB slab alignment, hash-map based mapping of blocks to slabs, intrusive lists for O(1) slab access, and automatic deallocation of empty slabs to optimize memory usage. These changes reduce memory fragmentation, stabilize performance under production load, and lower production risk. Commit reference: 10d3010763fc0fe0fca99952bfef0806fa25726c (protovm: slab allocator towards production quality (#1348)).
April 2025
3 Commits • 2 Features
Apr 1, 2025April 2025 performance summary for google/perfetto. Delivered core data-structure enhancement and a new dynamic proto runtime, with a targeted bug fix improving memory allocation reliability. These efforts advance runtime efficiency, reduce schema dependency, and set foundation for incremental trace updates while preserving code health.
3 Commits • 2 Features
Apr 1, 2025April 2025 performance summary for google/perfetto. Delivered core data-structure enhancement and a new dynamic proto runtime, with a targeted bug fix improving memory allocation reliability. These efforts advance runtime efficiency, reduce schema dependency, and set foundation for incremental trace updates while preserving code health.
April 2025
March 2025
1 Commits • 1 Features
Mar 1, 2025In March 2025, shipped the Input Event Tracing Data Source for Perfetto, expanding persistent tracing capabilities and enabling detailed input event capture across selected system packages. This update includes a dedicated trace buffer and new tracing rules to target input events from specific apps, improving debugging, performance analysis, and issue reproduction for the Android input subsystem. No major bug fixes were recorded this month; efforts focused on feature delivery and integration with the existing tracing framework. The change is captured in the google/perfetto repo with commit 8621d28dd6e338eb8edf592a2364d73c3d9a2ecf.
March 2025
1 Commits • 1 Features
Mar 1, 2025In March 2025, shipped the Input Event Tracing Data Source for Perfetto, expanding persistent tracing capabilities and enabling detailed input event capture across selected system packages. This update includes a dedicated trace buffer and new tracing rules to target input events from specific apps, improving debugging, performance analysis, and issue reproduction for the Android input subsystem. No major bug fixes were recorded this month; efforts focused on feature delivery and integration with the existing tracing framework. The change is captured in the google/perfetto repo with commit 8621d28dd6e338eb8edf592a2364d73c3d9a2ecf.
October 2024
1 Commits
Oct 1, 2024October 2024 monthly summary for google/perfetto focusing on the Perfetto Winscope Lite SDK versioning stabilization and related bug fix.
1 Commits
Oct 1, 2024October 2024 monthly summary for google/perfetto focusing on the Perfetto Winscope Lite SDK versioning stabilization and related bug fix.
October 2024
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Quality Metrics
Correctness94.0%
Maintainability90.0%
Architecture93.0%
Performance89.2%
AI Usage23.4%
Skills & Technologies
Programming Languages
BPC++GNJavaProtoProtoBufPythonSQLprotoprotobuf
Technical Skills
API designAlgorithm DesignAllocator DesignAndroid DevelopmentAndroid developmentBuild System ConfigurationBuild SystemsBuild Systems (Soong/Bazel)C++C++ DevelopmentC++ developmentConfiguration ManagementData ParsingData StructuresError Handling
Repositories Contributed To
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