google/perfetto
Oct 2024 – Jan 2026
16 Months active
Languages Used
C++GNProtoDockerfilePythonShellBUILDJava
Technical Skills
C++ConcurrencyThread SafetyBuild SystemsC++ DevelopmentCode Refactoring
Kirill Timofeev
PROFILE
Kirill Timofeev
Konstantin Timofeev developed and maintained core features for the google/perfetto repository, focusing on Android tracing, cross-platform build reliability, and CI automation. He engineered robust tracing integrations using C++ and Java, enabling in-process and reboot-trace workflows while improving data integrity and test coverage. His work included build system enhancements with Bazel and GN, JNI-based Android SDK modules, and cross-platform utilities for file I/O and memory management. By automating build configurations and optimizing CI with Bash and Python scripting, Konstantin improved developer productivity and release stability. His contributions demonstrated depth in system programming, code refactoring, and performance optimization across platforms.
Overall Statistics
Feature vs Bugs
71%Features
Repository Contributions
98Total
Bugs
13
Commits
98
Features
32
Lines of code
19,653
Activity Months16
Your Network
4595 peopleSame Organization
@google.com4362
Benedict OdaiMember
Craig IngramMember
KayyuriMember
Scott SuarezMember
Agent2Agent (A2A) BotMember
Andreas AbelMember
Aadi KapurMember
Aadish GoelMember
Aahil MehtaMember
Shared Repositories
233
Work History
January 2026
2 Commits • 2 Features
Jan 1, 2026January 2026 monthly summary for google/perfetto: Focused on cross-platform build reliability and CLI safety improvements. Delivered two high-impact features: (1) MacOS build compatibility by integrating CoreFoundation as a link-time dependency to ensure plugin compatibility across Mac environments; (2) CLI safety enhancement by adding a --no-clobber option to prevent overwriting existing output files, with accompanying tests. These changes improve developer experience, reduce risk of data loss, and broaden platform support for Perfetto.
2 Commits • 2 Features
Jan 1, 2026January 2026 monthly summary for google/perfetto: Focused on cross-platform build reliability and CLI safety improvements. Delivered two high-impact features: (1) MacOS build compatibility by integrating CoreFoundation as a link-time dependency to ensure plugin compatibility across Mac environments; (2) CLI safety enhancement by adding a --no-clobber option to prevent overwriting existing output files, with accompanying tests. These changes improve developer experience, reduce risk of data loss, and broaden platform support for Perfetto.
January 2026
December 2025
5 Commits • 1 Features
Dec 1, 2025Month 2025-12: Performance-oriented feature delivery and reliability improvements across the Perfetto boot tracing workflow, with a focus on maintaining data integrity, expanding test coverage, and improving error handling for production readiness.
December 2025
5 Commits • 1 Features
Dec 1, 2025Month 2025-12: Performance-oriented feature delivery and reliability improvements across the Perfetto boot tracing workflow, with a focus on maintaining data integrity, expanding test coverage, and improving error handling for production readiness.
November 2025
10 Commits • 2 Features
Nov 1, 2025November 2025 monthly summary for google/perfetto: Delivered core features enabling Android reboot-trace workflows and strengthened CI/test reliability, with targeted proto integration to support perfetto reboot report testing. Implementations included safe trace parsing with full TraceConfig extraction and signature validation, plus memory-mapping safety checks that reduce risk in trace uploads. CI/build infra enhancements streamlined test data management and feedback loops, accelerating validation of changes before shipping.
10 Commits • 2 Features
Nov 1, 2025November 2025 monthly summary for google/perfetto: Delivered core features enabling Android reboot-trace workflows and strengthened CI/test reliability, with targeted proto integration to support perfetto reboot report testing. Implementations included safe trace parsing with full TraceConfig extraction and signature validation, plus memory-mapping safety checks that reduce risk in trace uploads. CI/build infra enhancements streamlined test data management and feedback loops, accelerating validation of changes before shipping.
November 2025
October 2025
4 Commits • 2 Features
Oct 1, 2025October 2025 (2025-10) monthly summary for google/perfetto. Delivered enhancements to tracing session cloning and configuration, along with a Windows-specific fix, driving improved data integrity, session clonability, and cross-platform reliability. The work aligns with performance observability goals and reduces manual debugging in production by ensuring complete trace data is preserved in cloned sessions and by providing configurable flush behavior.
October 2025
4 Commits • 2 Features
Oct 1, 2025October 2025 (2025-10) monthly summary for google/perfetto. Delivered enhancements to tracing session cloning and configuration, along with a Windows-specific fix, driving improved data integrity, session clonability, and cross-platform reliability. The work aligns with performance observability goals and reduces manual debugging in production by ensuring complete trace data is preserved in cloned sessions and by providing configurable flush behavior.
September 2025
5 Commits • 2 Features
Sep 1, 2025September 2025: Focused on cross-platform reliability, developer experience, and Windows CI stability. Delivered a cross-platform file I/O utility, updated documentation to align with current tooling recommendations, and fixed Windows-specific test naming and file-size behavior, resulting in improved maintainability, faster onboarding, and more stable CI.
5 Commits • 2 Features
Sep 1, 2025September 2025: Focused on cross-platform reliability, developer experience, and Windows CI stability. Delivered a cross-platform file I/O utility, updated documentation to align with current tooling recommendations, and fixed Windows-specific test naming and file-size behavior, resulting in improved maintainability, faster onboarding, and more stable CI.
September 2025
August 2025
13 Commits • 3 Features
Aug 1, 2025August 2025 — Delivered major CI enhancements for google/perfetto: migrated CI caching and artifact management to Google Cloud Storage, improved reliability and WASM toolchain support, and cleaned up CI processes for maintainability. These changes reduced CI build times, improved artifact handling when builds fail, and strengthened the overall development workflow.
August 2025
13 Commits • 3 Features
Aug 1, 2025August 2025 — Delivered major CI enhancements for google/perfetto: migrated CI caching and artifact management to Google Cloud Storage, improved reliability and WASM toolchain support, and cleaned up CI processes for maintainability. These changes reduced CI build times, improved artifact handling when builds fail, and strengthened the overall development workflow.
July 2025
9 Commits • 3 Features
Jul 1, 2025July 2025 monthly summary for google/perfetto focusing on business value: 1) Conflict-free Android SDK integration via jarjar-ed modules; 2) Tracing performance improvements via priority boosting; 3) CI reliability and speed enhancements through optimized caching; 4) Stable CI cache behavior with a critical typo fix that restores the build-tools cache.
9 Commits • 3 Features
Jul 1, 2025July 2025 monthly summary for google/perfetto focusing on business value: 1) Conflict-free Android SDK integration via jarjar-ed modules; 2) Tracing performance improvements via priority boosting; 3) CI reliability and speed enhancements through optimized caching; 4) Stable CI cache behavior with a critical typo fix that restores the build-tools cache.
July 2025
June 2025
2 Commits • 2 Features
Jun 1, 2025June 2025 performance summary for google/perfetto: Focused on improving cross-module consistency and build reliability by centralizing common macros and automating build target defaults. This month emphasized maintainability, faster iteration, and stronger guarantees around cross-module usage and Android.bp build configurations.
June 2025
2 Commits • 2 Features
Jun 1, 2025June 2025 performance summary for google/perfetto: Focused on improving cross-module consistency and build reliability by centralizing common macros and automating build target defaults. This month emphasized maintainability, faster iteration, and stronger guarantees around cross-module usage and Android.bp build configurations.
May 2025
2 Commits • 1 Features
May 1, 2025May 2025 performance summary for google/perfetto: Delivered two core improvements focused on testability and trace reliability. (1) Exported the android_track_event proto as a separate target in BUILD and Android.bp to enable AndroidMessageQueue test parsing; (2) Implemented predefined_tracepoints.cc to filter inaccessible hardcoded atrace events, improving trace data reliability and accuracy. Updated proto definitions and dependencies to support these changes. These efforts reduced test flakiness, improved data fidelity, and strengthened end-to-end tracing for Android performance pipelines across the Perfetto project.
2 Commits • 1 Features
May 1, 2025May 2025 performance summary for google/perfetto: Delivered two core improvements focused on testability and trace reliability. (1) Exported the android_track_event proto as a separate target in BUILD and Android.bp to enable AndroidMessageQueue test parsing; (2) Implemented predefined_tracepoints.cc to filter inaccessible hardcoded atrace events, improving trace data reliability and accuracy. Updated proto definitions and dependencies to support these changes. These efforts reduced test flakiness, improved data fidelity, and strengthened end-to-end tracing for Android performance pipelines across the Perfetto project.
May 2025
April 2025
3 Commits • 2 Features
Apr 1, 2025April 2025 monthly summary for google/perfetto. Key features delivered: 1) Codebase cleanup to support formatting standardization and JNI naming upgrades, including excluding Java files from clang-format in preparation for google-java-format and renaming JNI functions to align with the new dev.perfetto.sdk package. Commits documenting these changes: 55ffcd5c9f98448119cb89a68124111440da529c and ab2d284059567dca5f9878669f6f1de057d13888. 2) Automatic native memory cleanup in the Android Java SDK using java.lang.ref.Cleaner, along with a minimum SDK bump to 33 and new Java/C++ bindings to ensure native allocations are freed when Java objects are garbage collected. Commit: 7c128b7b2af212705dd5e2907764afd8e4203845.
April 2025
3 Commits • 2 Features
Apr 1, 2025April 2025 monthly summary for google/perfetto. Key features delivered: 1) Codebase cleanup to support formatting standardization and JNI naming upgrades, including excluding Java files from clang-format in preparation for google-java-format and renaming JNI functions to align with the new dev.perfetto.sdk package. Commits documenting these changes: 55ffcd5c9f98448119cb89a68124111440da529c and ab2d284059567dca5f9878669f6f1de057d13888. 2) Automatic native memory cleanup in the Android Java SDK using java.lang.ref.Cleaner, along with a minimum SDK bump to 33 and new Java/C++ bindings to ensure native allocations are freed when Java objects are garbage collected. Commit: 7c128b7b2af212705dd5e2907764afd8e4203845.
March 2025
11 Commits • 5 Features
Mar 1, 2025March 2025 monthly summary for google/perfetto: This period focused on delivering JNI-based Android integration, expanding test infrastructure, stabilizing CI/build automation, and improving code quality. Delivered end-to-end Android JNI integration for Perfetto, enhanced test coverage with self-instrumented Android tests, and streamlined build tooling to accelerate validation and releases. Addressed critical build reliability issues and raised the Java SDK's testing capabilities to cover new annotations, while enforcing consistent formatting across the Android codebase.
11 Commits • 5 Features
Mar 1, 2025March 2025 monthly summary for google/perfetto: This period focused on delivering JNI-based Android integration, expanding test infrastructure, stabilizing CI/build automation, and improving code quality. Delivered end-to-end Android JNI integration for Perfetto, enhanced test coverage with self-instrumented Android tests, and streamlined build tooling to accelerate validation and releases. Addressed critical build reliability issues and raised the Java SDK's testing capabilities to cover new annotations, while enforcing consistent formatting across the Android codebase.
March 2025
February 2025
13 Commits • 3 Features
Feb 1, 2025Feb 2025 (2025-02) monthly summary for google/perfetto focused on delivering Android Java SDK integration improvements, stronger test tooling, and early attempts at CriticalNative support, with a rollback to maintain build stability.
February 2025
13 Commits • 3 Features
Feb 1, 2025Feb 2025 (2025-02) monthly summary for google/perfetto focused on delivering Android Java SDK integration improvements, stronger test tooling, and early attempts at CriticalNative support, with a rollback to maintain build stability.
January 2025
4 Commits • 1 Features
Jan 1, 2025January 2025 monthly summary for google/perfetto. Delivered Android Perfetto tracing integration and GN tooling improvements, enhancing in-app observability and build reliability. Key outcomes include enabling in-process tracing in the Android app with Bazel/Blaze build support, creation of C++ libraries and JNI/Java wrappers, migrated example usage to the Perfetto C API, and addition of tracing session utilities; APK linkage was updated to robustly include Perfetto native dependencies in Google3 via conditional -llog. Also fixed a GN tooling issue by making Target.__repr__ JSON-serializable (serializing only dependency names and transitive_deps). These contributions improve production observability, debugging capabilities, and tooling robustness for the project.
4 Commits • 1 Features
Jan 1, 2025January 2025 monthly summary for google/perfetto. Delivered Android Perfetto tracing integration and GN tooling improvements, enhancing in-app observability and build reliability. Key outcomes include enabling in-process tracing in the Android app with Bazel/Blaze build support, creation of C++ libraries and JNI/Java wrappers, migrated example usage to the Perfetto C API, and addition of tracing session utilities; APK linkage was updated to robustly include Perfetto native dependencies in Google3 via conditional -llog. Also fixed a GN tooling issue by making Target.__repr__ JSON-serializable (serializing only dependency names and transitive_deps). These contributions improve production observability, debugging capabilities, and tooling robustness for the project.
January 2025
December 2024
7 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for google/perfetto: Focused on stabilizing CI and Bazel tooling, aligning JDK versions in CI for Android SDK, and fixing a build issue caused by a missing include. These improvements reduce CI noise, improve cross-platform reliability, and enhance developer productivity.
December 2024
7 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for google/perfetto: Focused on stabilizing CI and Bazel tooling, aligning JDK versions in CI for Android SDK, and fixing a build issue caused by a missing include. These improvements reduce CI noise, improve cross-platform reliability, and enhance developer productivity.
November 2024
7 Commits • 2 Features
Nov 1, 2024Monthly overview for 2024-11 focusing on google/perfetto. Highlights: features delivered, bugs fixed, impact, and technologies demonstrated. Key deliverables include thread-safety annotations in standalone Perfetto builds, clone-trigger metadata in traces, and stabilization/refactoring of PerfettoCmdlineTest.
7 Commits • 2 Features
Nov 1, 2024Monthly overview for 2024-11 focusing on google/perfetto. Highlights: features delivered, bugs fixed, impact, and technologies demonstrated. Key deliverables include thread-safety annotations in standalone Perfetto builds, clone-trigger metadata in traces, and stabilization/refactoring of PerfettoCmdlineTest.
November 2024
October 2024
1 Commits
Oct 1, 2024Monthly summary for 2024-10 focusing on key accomplishments and business value; highlights the thread-safety improvement in Perfetto's UnixTaskRunner and its impact on reliability and maintainability.
October 2024
1 Commits
Oct 1, 2024Monthly summary for 2024-10 focusing on key accomplishments and business value; highlights the thread-safety improvement in Perfetto's UnixTaskRunner and its impact on reliability and maintainability.
Activity
Loading activity data...
Quality Metrics
Correctness94.8%
Maintainability91.4%
Architecture91.4%
Performance85.6%
AI Usage20.4%
Skills & Technologies
Programming Languages
BPBUILDBashBazelBlueprintC++DockerfileGNGNIJava
Technical Skills
Android DevelopmentAndroid Development Environment SetupAndroid NDKAndroid SDKAndroid TestingAndroid developmentBash ScriptingBazelBazel Build SystemBug FixingBuild CachingBuild SystemBuild System ConfigurationBuild System ManagementBuild Systems
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline