google/perfetto
Nov 2024 – May 2025
2 Months active
Languages Used
gnprotosqlC++MarkdownPython
Technical Skills
data processingmetric definitionperformance analysisBuild Systems (GN)Embedded SystemsKernel Development
Masami Hiramatsu
PROFILE
Masami Hiramatsu
Over a two-month period, contributed to google/perfetto by developing two core features focused on performance analysis and system reliability. Built the Perfetto Chrome Histogram Summary metric, introducing a new proto definition and SQL query to process and aggregate Chrome histogram data, enabling statistical insights into trace events for data-driven optimization. Later, implemented the linux.frozen_ftrace data source, allowing Perfetto to read ftrace data from previous boot sessions via a persistent ring buffer for robust post-crash analysis. Enhanced data integrity by adding lifecycle cleanup to erase trace data after reading. Work leveraged C++, Protocol Buffers, and system programming expertise.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
3Total
Bugs
0
Commits
3
Features
2
Lines of code
788
Activity Months2
Your Network
4951 peopleSame Organization
@google.com4703
Benedict OdaiMember
Craig IngramMember
KayyuriMember
Scott SuarezMember
Agent2Agent (A2A) BotMember
Andreas AbelMember
Aadi KapurMember
Aadish GoelMember
Aahil MehtaMember
Shared Repositories
248
Work History
May 2025
2 Commits • 1 Features
May 1, 2025Month: May 2025 – Delivered a new data source for post-crash analysis in Perfetto and hardened cross-boot data integrity. Implemented linux.frozen_ftrace to read ftrace data from the previous boot stored in a persistent ring buffer, enabling reliable post-crash/system-behavior analysis. Added lifecycle cleanup to erase trace data after reading, preventing re-reading in subsequent boots and improving data integrity for Perfetto AOT and crash workflows.
2 Commits • 1 Features
May 1, 2025Month: May 2025 – Delivered a new data source for post-crash analysis in Perfetto and hardened cross-boot data integrity. Implemented linux.frozen_ftrace to read ftrace data from the previous boot stored in a persistent ring buffer, enabling reliable post-crash/system-behavior analysis. Added lifecycle cleanup to erase trace data after reading, preventing re-reading in subsequent boots and improving data integrity for Perfetto AOT and crash workflows.
May 2025
November 2024
1 Commits • 1 Features
Nov 1, 2024Month: 2024-11 — concise monthly summary focusing on business value and technical achievements for google/perfetto. This period delivered a new metric: Perfetto Chrome Histogram Summary, enabling statistical insights into Chrome histogram events within trace data. Work included a new proto definition for histogram summaries and a SQL query to process and aggregate histogram data, establishing a foundation for data-driven performance analysis across Chrome deployments.
November 2024
1 Commits • 1 Features
Nov 1, 2024Month: 2024-11 — concise monthly summary focusing on business value and technical achievements for google/perfetto. This period delivered a new metric: Perfetto Chrome Histogram Summary, enabling statistical insights into Chrome histogram events within trace data. Work included a new proto definition for histogram summaries and a SQL query to process and aggregate histogram data, establishing a foundation for data-driven performance analysis across Chrome deployments.
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Quality Metrics
Correctness100.0%
Maintainability100.0%
Architecture100.0%
Performance86.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++MarkdownPythongnprotosql
Technical Skills
Build Systems (GN)Embedded SystemsKernel DevelopmentKernel TracingPerformance AnalysisProtocol BuffersSystem Programmingdata processingmetric definitionperformance analysis
Repositories Contributed To
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