google/perfetto
Nov 2024 – Mar 2026
15 Months active
Languages Used
C++JavaScriptTypeScriptShellPythonJavaMarkdownProto
Technical Skills
DebuggingKernel TracingPerformance AnalysisPerformance OptimizationSystem ProgrammingUI Development
Ryan
PROFILE
Ryan
Over 15 months, Roman Savitski engineered core tracing and profiling features for the google/perfetto repository, focusing on kernel interaction, memory management, and data visualization. He delivered enhancements such as dynamic ftrace event parsing, kernel thread visualization, and robust memory profiling for Android’s Bionic environment. Using C++, Python, and Protocol Buffers, Roman refactored tracing pipelines for reliability, introduced self-describing protobuf encodings, and improved multi-machine trace fidelity. His work addressed cross-platform build stability, streamlined code formatting, and optimized performance analysis workflows. These contributions deepened trace accuracy, reduced maintenance overhead, and improved developer experience, reflecting a strong command of low-level systems programming.
Overall Statistics
Feature vs Bugs
79%Features
Repository Contributions
87Total
Bugs
10
Commits
87
Features
37
Lines of code
15,388
Activity Months15
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
March 2026
1 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for google/perfetto focused on memory management enhancements for the Bionic environment and improved profiling accuracy. Delivered a new heapprofd_reallocarray hook to enable realloc-based allocations, with an overflow protection path to prevent allocation errors and ensure stable, accurate memory reporting for the new allocation method. This work enhances memory efficiency, reliability, and profiling visibility for Android workloads, supporting better performance analysis and optimization decisions.
1 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for google/perfetto focused on memory management enhancements for the Bionic environment and improved profiling accuracy. Delivered a new heapprofd_reallocarray hook to enable realloc-based allocations, with an overflow protection path to prevent allocation errors and ensure stable, accurate memory reporting for the new allocation method. This work enhances memory efficiency, reliability, and profiling visibility for Android workloads, supporting better performance analysis and optimization decisions.
March 2026
December 2025
1 Commits • 1 Features
Dec 1, 2025December 2025 monthly summary for google/perfetto focused on UI/visualization improvements and kernel thread data presentation. Delivered a significant feature enhancement to kernel thread and thread track visualization, reduced UI clutter by removing an empty summary track, and simplified kernel thread queries. These changes improve diagnosability and user efficiency when analyzing kernel thread performance.
December 2025
1 Commits • 1 Features
Dec 1, 2025December 2025 monthly summary for google/perfetto focused on UI/visualization improvements and kernel thread data presentation. Delivered a significant feature enhancement to kernel thread and thread track visualization, reduced UI clutter by removing an empty summary track, and simplified kernel thread queries. These changes improve diagnosability and user efficiency when analyzing kernel thread performance.
November 2025
7 Commits • 3 Features
Nov 1, 2025November 2025 performance month focused on strengthening tracing reliability, multi-machine behavior, and developer usability for google/perfetto. Delivered major tracing core enhancements with crash-key instrumentation, expanded shared memory footprint, and a controlled default for cross-machine data matching (with opt-in to restore previous behavior). Updated trace descriptors and tracepoints, and aligned ftrace protocol and proto generation to support newer kernels. Implemented TraceConv auto-detection to simplify profile identification and improved UX when multiple profiles are present. Conducted code cleanup by removing unused trace conversion files, reducing maintenance burden. These changes collectively improve trace fidelity, reduce debugging time, and enable safer, scalable multi-machine tracing across devices and emulators.
7 Commits • 3 Features
Nov 1, 2025November 2025 performance month focused on strengthening tracing reliability, multi-machine behavior, and developer usability for google/perfetto. Delivered major tracing core enhancements with crash-key instrumentation, expanded shared memory footprint, and a controlled default for cross-machine data matching (with opt-in to restore previous behavior). Updated trace descriptors and tracepoints, and aligned ftrace protocol and proto generation to support newer kernels. Implemented TraceConv auto-detection to simplify profile identification and improved UX when multiple profiles are present. Conducted code cleanup by removing unused trace conversion files, reducing maintenance burden. These changes collectively improve trace fidelity, reduce debugging time, and enable safer, scalable multi-machine tracing across devices and emulators.
November 2025
October 2025
6 Commits • 3 Features
Oct 1, 2025October 2025 monthly summary for google/perfetto: Delivered targeted tracing improvements, stability fixes, and code maintenance across the Perfetto repository. Emphasized business value through trace size reductions, improved analysis Readability, and safer Android rollout readiness.
October 2025
6 Commits • 3 Features
Oct 1, 2025October 2025 monthly summary for google/perfetto: Delivered targeted tracing improvements, stability fixes, and code maintenance across the Perfetto repository. Emphasized business value through trace size reductions, improved analysis Readability, and safer Android rollout readiness.
September 2025
7 Commits • 4 Features
Sep 1, 2025September 2025 — Google Perfetto: Delivered deeper performance tracing capabilities, expanded system performance visibility, faster validation feedback, and tightened maintenance practices. These efforts provide clearer perf data for debugging, faster CI cycles, and better ownership alignment across the project.
7 Commits • 4 Features
Sep 1, 2025September 2025 — Google Perfetto: Delivered deeper performance tracing capabilities, expanded system performance visibility, faster validation feedback, and tightened maintenance practices. These efforts provide clearer perf data for debugging, faster CI cycles, and better ownership alignment across the project.
September 2025
August 2025
17 Commits • 8 Features
Aug 1, 2025Summary for Perfetto focusing on business value and technical achievements for 2025-08. Delivered kernel track events support enabling visualization of kernel activity on Perfetto tracks, along with extensive UI and documentation improvements. Strengthened stability and build reliability across platforms, including critical fixes for StatusOr use-after-move, Windows include order, and JNI build flags. Introduced per-CPU ftrace statistics and a conservative 5-minute libunwindstack cache purge to balance memory usage in trace processing. Added user-facing feedback for traced_perf compilation status, improving guidance for users. Enhanced UX and data models with a Hypervisor track group, SurfaceFlinger system_content_priority, and deprecation of legacy data sources, accompanied by comprehensive docs updates to reduce maintenance burden and improve developer experience.
August 2025
17 Commits • 8 Features
Aug 1, 2025Summary for Perfetto focusing on business value and technical achievements for 2025-08. Delivered kernel track events support enabling visualization of kernel activity on Perfetto tracks, along with extensive UI and documentation improvements. Strengthened stability and build reliability across platforms, including critical fixes for StatusOr use-after-move, Windows include order, and JNI build flags. Introduced per-CPU ftrace statistics and a conservative 5-minute libunwindstack cache purge to balance memory usage in trace processing. Added user-facing feedback for traced_perf compilation status, improving guidance for users. Enhanced UX and data models with a Hypervisor track group, SurfaceFlinger system_content_priority, and deprecation of legacy data sources, accompanied by comprehensive docs updates to reduce maintenance burden and improve developer experience.
July 2025
8 Commits • 3 Features
Jul 1, 2025July 2025 (2025-07) monthly recap for google/perfetto focused on enhancing ftrace data reliability, control, and maintainability. Delivered dynamic parsing of self-describing ftrace events via a GenericFtraceTracker to manage proto descriptors and enable FtraceTokenizer/FtraceParser to parse and store data correctly. Added a userspace-only ftrace event collection option to give users tighter control over tracing when atrace categories are specified. Reinstated a ftrace cropping workaround to address widespread trace reliance, with ongoing investigation to identify root causes. Completed internal maintenance and docs alignment for ftrace, including proto readability improvements, internal naming consistency (FtraceProcfs -> Tracefs), code cleanup, and updated usage examples to remain accurate with kernel API changes. Overall, these changes improve data accuracy, configurability, and maintainability, delivering tangible business value through better tracing fidelity and reduced maintenance burden.
8 Commits • 3 Features
Jul 1, 2025July 2025 (2025-07) monthly recap for google/perfetto focused on enhancing ftrace data reliability, control, and maintainability. Delivered dynamic parsing of self-describing ftrace events via a GenericFtraceTracker to manage proto descriptors and enable FtraceTokenizer/FtraceParser to parse and store data correctly. Added a userspace-only ftrace event collection option to give users tighter control over tracing when atrace categories are specified. Reinstated a ftrace cropping workaround to address widespread trace reliance, with ongoing investigation to identify root causes. Completed internal maintenance and docs alignment for ftrace, including proto readability improvements, internal naming consistency (FtraceProcfs -> Tracefs), code cleanup, and updated usage examples to remain accurate with kernel API changes. Overall, these changes improve data accuracy, configurability, and maintainability, delivering tangible business value through better tracing fidelity and reduced maintenance burden.
July 2025
June 2025
2 Commits • 1 Features
Jun 1, 2025June 2025: Delivered Ftrace Clock Handling Enhancements for google/perfetto, focusing on local clock synchronization, clock-type handling, and improved snapshot fidelity. Also added support for secondary ftrace instances to improve multi-instance tracing. This work enhances trace accuracy, bundle integrity, and debugging reliability across devices and use cases.
June 2025
2 Commits • 1 Features
Jun 1, 2025June 2025: Delivered Ftrace Clock Handling Enhancements for google/perfetto, focusing on local clock synchronization, clock-type handling, and improved snapshot fidelity. Also added support for secondary ftrace instances to improve multi-instance tracing. This work enhances trace accuracy, bundle integrity, and debugging reliability across devices and use cases.
May 2025
2 Commits • 1 Features
May 1, 2025May 2025 monthly summary focusing on key accomplishments and business value for google/perfetto. The month prioritized standardized code formatting and protobuf compatibility improvements to reduce maintenance burden and improve contributor onboarding.Within google/perfetto, two high-impact items were completed: uniform code formatting and protobuf field option remediation.
2 Commits • 1 Features
May 1, 2025May 2025 monthly summary focusing on key accomplishments and business value for google/perfetto. The month prioritized standardized code formatting and protobuf compatibility improvements to reduce maintenance burden and improve contributor onboarding.Within google/perfetto, two high-impact items were completed: uniform code formatting and protobuf field option remediation.
May 2025
April 2025
6 Commits • 4 Features
Apr 1, 2025April 2025 — Performance-focused contributions in google/perfetto: delivered efficient self-describing protobuf encoding for generic ftrace events, reduced CI friction with clang-format-based tab handling, updated docs for protobuf-based synthetic track events, and performed proto maintenance for readability and maintainability. Impact includes improved data encoding efficiency, streamlined CI, and better maintainability across protos.
April 2025
6 Commits • 4 Features
Apr 1, 2025April 2025 — Performance-focused contributions in google/perfetto: delivered efficient self-describing protobuf encoding for generic ftrace events, reduced CI friction with clang-format-based tab handling, updated docs for protobuf-based synthetic track events, and performed proto maintenance for readability and maintainability. Impact includes improved data encoding efficiency, streamlined CI, and better maintainability across protos.
March 2025
20 Commits • 7 Features
Mar 1, 2025March 2025 performance summary for google/perfetto: Delivered core profiling enhancements, improved sampling accuracy, and stronger kernel-thread tracing; tightened the proto/build pipeline; and restructured tests to improve CI reliability. These changes increase data accuracy, core-specific profiling capabilities, and maintainability, enabling faster performance insights for developers and platform teams.
20 Commits • 7 Features
Mar 1, 2025March 2025 performance summary for google/perfetto: Delivered core profiling enhancements, improved sampling accuracy, and stronger kernel-thread tracing; tightened the proto/build pipeline; and restructured tests to improve CI reliability. These changes increase data accuracy, core-specific profiling capabilities, and maintainability, enabling faster performance insights for developers and platform teams.
March 2025
February 2025
3 Commits
Feb 1, 2025February 2025 monthly summary for google/perfetto. Delivered three targeted bug fixes across the tracing pipeline to improve robustness, cross-compiler consistency, and data integrity, without changing core functionality. Highlights include: Breakpad parser cross-compiler error handling fix; Proto generation: kprobe_event ID skipping fix; Ftrace parser TGID handling normalization for DPU tracing mark write events. Commits implemented: 0d854f007653b31635c203068b3c5c0729d65d29; f8977d9b891f18393ed9f06ffac7454c39a04fbc; c020e64c5f6f558682b5dc01098d678009d715fe.
February 2025
3 Commits
Feb 1, 2025February 2025 monthly summary for google/perfetto. Delivered three targeted bug fixes across the tracing pipeline to improve robustness, cross-compiler consistency, and data integrity, without changing core functionality. Highlights include: Breakpad parser cross-compiler error handling fix; Proto generation: kprobe_event ID skipping fix; Ftrace parser TGID handling normalization for DPU tracing mark write events. Commits implemented: 0d854f007653b31635c203068b3c5c0729d65d29; f8977d9b891f18393ed9f06ffac7454c39a04fbc; c020e64c5f6f558682b5dc01098d678009d715fe.
January 2025
2 Commits
Jan 1, 2025January 2025 monthly summary for google/perfetto focused on core robustness and correctness fixes in perf tracing to improve stability and data accuracy across kernel versions and usage scenarios.
2 Commits
Jan 1, 2025January 2025 monthly summary for google/perfetto focused on core robustness and correctness fixes in perf tracing to improve stability and data accuracy across kernel versions and usage scenarios.
January 2025
December 2024
1 Commits • 1 Features
Dec 1, 2024Month: 2024-12 — Performance engineering monthly summary for google/perfetto. Key feature delivered: Kernel Symbolization Visibility on Release Builds. Enabled tracing tools (traced_probes and traced_perf) to inherit a file descriptor to /proc/kallsyms from init, with a locking mechanism to handle concurrent reads, improving visibility of kernel symbols on restricted builds. Commit 061d1aa2dc70787c88a7d31e2fe5dee9621db703 documents: traced_probes, traced_perf: allow kernel symbolisation on release builds with init's assistance.
December 2024
1 Commits • 1 Features
Dec 1, 2024Month: 2024-12 — Performance engineering monthly summary for google/perfetto. Key feature delivered: Kernel Symbolization Visibility on Release Builds. Enabled tracing tools (traced_probes and traced_perf) to inherit a file descriptor to /proc/kallsyms from init, with a locking mechanism to handle concurrent reads, improving visibility of kernel symbols on restricted builds. Commit 061d1aa2dc70787c88a7d31e2fe5dee9621db703 documents: traced_probes, traced_perf: allow kernel symbolisation on release builds with init's assistance.
November 2024
4 Commits
Nov 1, 2024Month: 2024-11 focused on improving Perfetto's tracing reliability and UI data correctness in the google/perfetto repository. The work emphasizes data integrity, reduced data gaps, and accurate visualization, delivering tangible business value for developers relying on precise trace data.
4 Commits
Nov 1, 2024Month: 2024-11 focused on improving Perfetto's tracing reliability and UI data correctness in the google/perfetto repository. The work emphasizes data integrity, reduced data gaps, and accurate visualization, delivering tangible business value for developers relying on precise trace data.
November 2024
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Quality Metrics
Correctness92.6%
Maintainability91.2%
Architecture89.8%
Performance86.8%
AI Usage21.0%
Skills & Technologies
Programming Languages
CC++JavaJavaScriptMakefileMarkdownN/AProtoPythonSQL
Technical Skills
Android DevelopmentAndroid InternalsBug FixingBuild AutomationBuild SystemBuild SystemsBuild Systems (GN/BP)C++C++ DevelopmentC++ developmentCI/CDChangelog ManagementCode CleanupCode FormattingCode Generation
Repositories Contributed To
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