google/perfetto
Oct 2024 – Oct 2025
11 Months active
Languages Used
C++ProtoJavaPythonBUILDBazelGNGit
Technical Skills
C++Command-line InterfaceIPCSystem ProgrammingTestingTracing
Daniele Di Proietto
PROFILE
Daniele Di Proietto
Daniele Di Proietto contributed to the google/perfetto repository by engineering core tracing infrastructure, focusing on reliability, cross-platform compatibility, and maintainability. Over 11 months, Daniele delivered features such as clone lifecycle tracing, enhanced heap graph analysis, and robust build system integration using C++ and Bazel. He refactored subsystems like Track Event for clearer code organization and improved test stability through targeted debugging and concurrency fixes. His work included protocol buffer schema evolution, static linking support, and enhancements to trace data integrity. These efforts resulted in more reliable performance analysis, safer APIs, and streamlined developer workflows across diverse platforms and toolchains.
Overall Statistics
Feature vs Bugs
65%Features
Repository Contributions
115Total
Bugs
18
Commits
115
Features
33
Lines of code
9,891
Activity Months11
Your Network
4376 people
Work History
October 2025
2 Commits • 1 Features
Oct 1, 2025October 2025 monthly summary for google/perfetto focused on structural improvements to the Track Event subsystem to improve maintainability and build reliability without changing runtime behavior.
2 Commits • 1 Features
Oct 1, 2025October 2025 monthly summary for google/perfetto focused on structural improvements to the Track Event subsystem to improve maintainability and build reliability without changing runtime behavior.
October 2025
August 2025
4 Commits • 1 Features
Aug 1, 2025Performance-focused monthly update for google/perfetto (2025-08). Key deliverables targeted stability, correctness, and build tooling enhancements to improve reliability and cross-platform support in the Perfetto performance analysis suite.
August 2025
4 Commits • 1 Features
Aug 1, 2025Performance-focused monthly update for google/perfetto (2025-08). Key deliverables targeted stability, correctness, and build tooling enhancements to improve reliability and cross-platform support in the Perfetto performance analysis suite.
July 2025
12 Commits • 5 Features
Jul 1, 2025July 2025 performance summary for google/perfetto: Delivered key features and fixes that enhance tracing accuracy, metadata richness, build reliability, and tooling. Implemented Heap Graph root handling to improve startup trace correctness, expanded Protobuf schemas for richer trace context, stabilized Android builds with vendor linkage and perfetto_flags improvements, and improved tracing internals through const-correctness and optimized data source callbacks. Updated documentation and test tooling to ensure reliable traces, including handling traces with extensions. These efforts improve debugging capabilities, reduce integration risk, and enable more actionable performance analysis for end users.
12 Commits • 5 Features
Jul 1, 2025July 2025 performance summary for google/perfetto: Delivered key features and fixes that enhance tracing accuracy, metadata richness, build reliability, and tooling. Implemented Heap Graph root handling to improve startup trace correctness, expanded Protobuf schemas for richer trace context, stabilized Android builds with vendor linkage and perfetto_flags improvements, and improved tracing internals through const-correctness and optimized data source callbacks. Updated documentation and test tooling to ensure reliable traces, including handling traces with extensions. These efforts improve debugging capabilities, reduce integration risk, and enable more actionable performance analysis for end users.
July 2025
June 2025
10 Commits • 3 Features
Jun 1, 2025June 2025 monthly summary for google/perfetto: Delivered targeted tracing/build enhancements, improved Git sync reliability, and extended heap graph parsing to runtime internal objects. Implemented proto and tracing refinements for buffer_seq_id, apply_token, and libstdc++ compatibility; removed temporary dependencies; improved test compatibility. Strengthened Git notes fetch during sync to prevent conflicts, enabling safer, faster integrations. Result: more stable builds, deeper runtime memory insights, and faster issue diagnosis across performance workloads.
June 2025
10 Commits • 3 Features
Jun 1, 2025June 2025 monthly summary for google/perfetto: Delivered targeted tracing/build enhancements, improved Git sync reliability, and extended heap graph parsing to runtime internal objects. Implemented proto and tracing refinements for buffer_seq_id, apply_token, and libstdc++ compatibility; removed temporary dependencies; improved test compatibility. Strengthened Git notes fetch during sync to prevent conflicts, enabling safer, faster integrations. Result: more stable builds, deeper runtime memory insights, and faster issue diagnosis across performance workloads.
May 2025
11 Commits • 1 Features
May 1, 2025For 2025-05, the Perfetto team focused on stabilizing the build and test tooling, hardening the tracing backend, and delivering clearer display handling. Key outcomes include a new display type differentiation feature, architecture improvements in deobfuscation, targeted tests for engine initialization, and cross-platform reliability fixes that reduce crashes and improve CI stability. These efforts improve product reliability for performance analysis, reduce time-to-ship via more robust presubmit and build tooling, and demonstrate proficiency in C++14/17, MSVC compatibility, and cross-platform testing.
11 Commits • 1 Features
May 1, 2025For 2025-05, the Perfetto team focused on stabilizing the build and test tooling, hardening the tracing backend, and delivering clearer display handling. Key outcomes include a new display type differentiation feature, architecture improvements in deobfuscation, targeted tests for engine initialization, and cross-platform reliability fixes that reduce crashes and improve CI stability. These efforts improve product reliability for performance analysis, reduce time-to-ship via more robust presubmit and build tooling, and demonstrate proficiency in C++14/17, MSVC compatibility, and cross-platform testing.
May 2025
April 2025
26 Commits • 11 Features
Apr 1, 2025April 2025: Focused on delivering business-value improvements to tracing fidelity, API safety, cross-platform stability, and release automation. Key features delivered include tracing service enhancements with clock snapshot emission on trigger/clone and stop_delay_ms recording, API tightening by removing default arguments for trace writer creation, and tracing policy/DataSourceParams improvements enabling more robust buffering and configurability. Build and platform fixes improved Windows compatibility (python usage and venv handling) and Bazel/libstdcxx stability, while prebuilts roll automation and updated CHANGELOGs accelerated release readiness. Major fixes also covered cleanup: removal of obsolete pre-submit checks and housekeeping in tracing-related components. These changes collectively improve trace fidelity, reliability across Windows and Linux, and maintain a safer, more maintainable API for downstream users.
April 2025
26 Commits • 11 Features
Apr 1, 2025April 2025: Focused on delivering business-value improvements to tracing fidelity, API safety, cross-platform stability, and release automation. Key features delivered include tracing service enhancements with clock snapshot emission on trigger/clone and stop_delay_ms recording, API tightening by removing default arguments for trace writer creation, and tracing policy/DataSourceParams improvements enabling more robust buffering and configurability. Build and platform fixes improved Windows compatibility (python usage and venv handling) and Bazel/libstdcxx stability, while prebuilts roll automation and updated CHANGELOGs accelerated release readiness. Major fixes also covered cleanup: removal of obsolete pre-submit checks and housekeeping in tracing-related components. These changes collectively improve trace fidelity, reliability across Windows and Linux, and maintain a safer, more maintainable API for downstream users.
March 2025
2 Commits • 2 Features
Mar 1, 2025March 2025 performance instrumentation and host-build stabilization for google/perfetto. Delivered two core features that enhance observability and build reliability: - Clone operation performance tracing enhancements with a new stdlib table trigger_clone_flush_latency to measure trigger-based clone processing time, plus refactoring of clone_duration to use the stdlib table for granular performance insights. - Static linking support for host builds of libperfetto_c by changing the module type from cc_library_shared to cc_library and updating Android.bp to support the new type, ensuring host builds link statically with libandroid_runtime. - Build tooling improvements to support the new static library type, with updates to tools/gen_android_bp to handle dependencies correctly. Impact: improved observability and performance diagnosis of clone operations, more portable and reliable host builds, and reduced runtime dependencies on the host environment. Technologies/skills demonstrated: C/C++, performance instrumentation, stdlib-backed metrics, Bazel/Android.bp module types, static linking, and build tooling.
2 Commits • 2 Features
Mar 1, 2025March 2025 performance instrumentation and host-build stabilization for google/perfetto. Delivered two core features that enhance observability and build reliability: - Clone operation performance tracing enhancements with a new stdlib table trigger_clone_flush_latency to measure trigger-based clone processing time, plus refactoring of clone_duration to use the stdlib table for granular performance insights. - Static linking support for host builds of libperfetto_c by changing the module type from cc_library_shared to cc_library and updating Android.bp to support the new type, ensuring host builds link statically with libandroid_runtime. - Build tooling improvements to support the new static library type, with updates to tools/gen_android_bp to handle dependencies correctly. Impact: improved observability and performance diagnosis of clone operations, more portable and reliable host builds, and reduced runtime dependencies on the host environment. Technologies/skills demonstrated: C/C++, performance instrumentation, stdlib-backed metrics, Bazel/Android.bp module types, static linking, and build tooling.
March 2025
January 2025
18 Commits • 1 Features
Jan 1, 2025January 2025 performance summary for google/perfetto: Delivered release readiness for the v49.0 cycle with external build compatibility in focus, implemented a critical API stability fix for C Data Source handling during postponed stops, and completed broad stability and portability improvements (MSVC/Windows and cross-compiler build-system friendliness). These efforts reduce external integration risk, improve data emission reliability, and strengthen cross-platform engineering discipline.
January 2025
18 Commits • 1 Features
Jan 1, 2025January 2025 performance summary for google/perfetto: Delivered release readiness for the v49.0 cycle with external build compatibility in focus, implemented a critical API stability fix for C Data Source handling during postponed stops, and completed broad stability and portability improvements (MSVC/Windows and cross-compiler build-system friendliness). These efforts reduce external integration risk, improve data emission reliability, and strengthen cross-platform engineering discipline.
December 2024
15 Commits • 2 Features
Dec 1, 2024In December 2024, Perfetto delivered several high-impact tracing enhancements and reliability improvements for multi-platform usage. Key features delivered include clone lifecycle tracing with a new clone duration metric, and service/SDK enhancements adding kprobes with ftrace support and NamedTrack capability. Critical fix for SnapshotLifecycleEvent typos improved event logging reliability. Build system stability and cross-platform fixes strengthened Bazel workflows and Windows/NaCl compatibility, reducing integration risk. These changes collectively improve observability, performance analysis, and developer experience, delivering business value by enabling faster root cause analysis and broader platform support.
15 Commits • 2 Features
Dec 1, 2024In December 2024, Perfetto delivered several high-impact tracing enhancements and reliability improvements for multi-platform usage. Key features delivered include clone lifecycle tracing with a new clone duration metric, and service/SDK enhancements adding kprobes with ftrace support and NamedTrack capability. Critical fix for SnapshotLifecycleEvent typos improved event logging reliability. Build system stability and cross-platform fixes strengthened Bazel workflows and Windows/NaCl compatibility, reducing integration risk. These changes collectively improve observability, performance analysis, and developer experience, delivering business value by enabling faster root cause analysis and broader platform support.
December 2024
November 2024
12 Commits • 4 Features
Nov 1, 20242024-11 Monthly Summary — google/perfetto Key features and fixes delivered this month reflect a focus on reliability, data integrity, and maintainability, with measurable business value in test stability, trace quality, and developer productivity: - Test stability improvements for HeapprofdJavaCtsTest: introduced a NoopActivity to reduce process forking contention and disabled JIT in test apps to improve reliability and determinism. Commits: a36fea4d858352b0bfe106d028faeec273b0b842; 6d76517f199ebefcee3bce93346d6ce446c1d3d7. - Trace data integrity and completeness: ensured parent tracks are emitted before children and isolated incremental state per data source instance to fix incomplete trace data and cross-instance interference. Commits: 3179af13ebac4785ddc3832017d3fd99f4c2143b; a26171ee5e88c21e899fa46eb7bdcad8ac33e72d. - Thread-safety enhancements and API hygiene: added thread-safety annotations and converted GlobalState to a class; annotate PerfettoDsImpl guards for safer multithreading. Commits: 5ac4baad2095486e8e742de94bbd1a4bca72e230; e1fe418051da5af178c624380aa28faac269abd2. - Build system and test isolation improvements: hardened setup by restricting libperfetto_c headers exposure and isolating test dependencies to prevent unintended coupling. Commits: 5212a65ae25e72336a00e3f79287fc4e3062771f; 740dd926ed5ccfa96d09bc8565b7c9b507e11bd4. - Code cleanup and readability improvements: cleanup dead code and rename for clarity (remove unused macro; rename PageHeader::layout to header_bitmap). Commits: 5ea57a9daa99de33d1f87995baeaf018a6ebb83b; d08ebe3da022e6d84bfdc682009fcb3a19f1a84c. - Diagnostic logging enhancements: add detailed shared memory buffer statistics on stalls and improve logging messages to aid diagnostics. Commits: e34abf37f1541783b49276f08b463a66c82fe82a; d6ac03ff9b62f889b143a691e1a913395db84f87. Top 3-5 achievements: - Stability and reliability improvements for HeapprofdJavaCtsTest - Trace data integrity with per-instance isolation - Thread-safety and API hygiene enhancements Overall impact and accomplishments: - Increased test determinism and reliability, reducing debugging time and flaky behavior. - More robust trace data: correct parent-child emission order and per-source isolation. - Safer multithreading posture across core components, reducing race conditions in production integrations. - Cleaner build/test infrastructure leading to faster iteration and fewer regressions. - Enhanced diagnostics enabling faster issue detection and troubleshooting. Technologies/skills demonstrated: - Java concurrency considerations and thread-safety annotations - Build hygiene with Bazel: header exposure controls and test isolation - Data-trace design: per-instance incremental state and hierarchical emission guarantees - Instrumentation and logging: improved diagnostics for shared memory and stalls
November 2024
12 Commits • 4 Features
Nov 1, 20242024-11 Monthly Summary — google/perfetto Key features and fixes delivered this month reflect a focus on reliability, data integrity, and maintainability, with measurable business value in test stability, trace quality, and developer productivity: - Test stability improvements for HeapprofdJavaCtsTest: introduced a NoopActivity to reduce process forking contention and disabled JIT in test apps to improve reliability and determinism. Commits: a36fea4d858352b0bfe106d028faeec273b0b842; 6d76517f199ebefcee3bce93346d6ce446c1d3d7. - Trace data integrity and completeness: ensured parent tracks are emitted before children and isolated incremental state per data source instance to fix incomplete trace data and cross-instance interference. Commits: 3179af13ebac4785ddc3832017d3fd99f4c2143b; a26171ee5e88c21e899fa46eb7bdcad8ac33e72d. - Thread-safety enhancements and API hygiene: added thread-safety annotations and converted GlobalState to a class; annotate PerfettoDsImpl guards for safer multithreading. Commits: 5ac4baad2095486e8e742de94bbd1a4bca72e230; e1fe418051da5af178c624380aa28faac269abd2. - Build system and test isolation improvements: hardened setup by restricting libperfetto_c headers exposure and isolating test dependencies to prevent unintended coupling. Commits: 5212a65ae25e72336a00e3f79287fc4e3062771f; 740dd926ed5ccfa96d09bc8565b7c9b507e11bd4. - Code cleanup and readability improvements: cleanup dead code and rename for clarity (remove unused macro; rename PageHeader::layout to header_bitmap). Commits: 5ea57a9daa99de33d1f87995baeaf018a6ebb83b; d08ebe3da022e6d84bfdc682009fcb3a19f1a84c. - Diagnostic logging enhancements: add detailed shared memory buffer statistics on stalls and improve logging messages to aid diagnostics. Commits: e34abf37f1541783b49276f08b463a66c82fe82a; d6ac03ff9b62f889b143a691e1a913395db84f87. Top 3-5 achievements: - Stability and reliability improvements for HeapprofdJavaCtsTest - Trace data integrity with per-instance isolation - Thread-safety and API hygiene enhancements Overall impact and accomplishments: - Increased test determinism and reliability, reducing debugging time and flaky behavior. - More robust trace data: correct parent-child emission order and per-source isolation. - Safer multithreading posture across core components, reducing race conditions in production integrations. - Cleaner build/test infrastructure leading to faster iteration and fewer regressions. - Enhanced diagnostics enabling faster issue detection and troubleshooting. Technologies/skills demonstrated: - Java concurrency considerations and thread-safety annotations - Build hygiene with Bazel: header exposure controls and test isolation - Data-trace design: per-instance incremental state and hierarchical emission guarantees - Instrumentation and logging: improved diagnostics for shared memory and stalls
October 2024
3 Commits • 2 Features
Oct 1, 2024October 2024 focused on enhancing developer experience and SDK integration for google/perfetto. Key features delivered include: (1) Clone Tracing Sessions by Name: added ability to clone sessions by a unique session name via CLI flag --clone-by-name and updated IPC/service logic to support name-based cloning; (2) Export ProcessDescriptor and TrackDescriptor Proto Headers for SDK Access: updated header visibility to expose proto headers to SDK users, improving accessibility from SDKs. Major bugs fixed: No explicit major bugs reported in the provided data. Overall impact and accomplishments: Improved session management and cloning workflows, enabling reproducible testing and easier session sharing; enhanced SDK integration by exposing core proto headers, reducing integration friction for SDK consumers. This work strengthens the reliability of Perfetto’s tracing workflow and broadens the adoption vector for SDK-based tooling. Technologies/skills demonstrated: IPC/service architecture updates, CLI flag parsing and command integration, header visibility and Protobuf descriptor exposure, SDK-facing API accessibility, version-controlled feature delivery.
3 Commits • 2 Features
Oct 1, 2024October 2024 focused on enhancing developer experience and SDK integration for google/perfetto. Key features delivered include: (1) Clone Tracing Sessions by Name: added ability to clone sessions by a unique session name via CLI flag --clone-by-name and updated IPC/service logic to support name-based cloning; (2) Export ProcessDescriptor and TrackDescriptor Proto Headers for SDK Access: updated header visibility to expose proto headers to SDK users, improving accessibility from SDKs. Major bugs fixed: No explicit major bugs reported in the provided data. Overall impact and accomplishments: Improved session management and cloning workflows, enabling reproducible testing and easier session sharing; enhanced SDK integration by exposing core proto headers, reducing integration friction for SDK consumers. This work strengthens the reliability of Perfetto’s tracing workflow and broadens the adoption vector for SDK-based tooling. Technologies/skills demonstrated: IPC/service architecture updates, CLI flag parsing and command integration, header visibility and Protobuf descriptor exposure, SDK-facing API accessibility, version-controlled feature delivery.
October 2024
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Quality Metrics
Correctness95.0%
Maintainability94.0%
Architecture93.4%
Performance89.4%
AI Usage20.2%
Skills & Technologies
Programming Languages
BPBUILDBashBazelCC++GNGitJavaMarkdown
Technical Skills
API DesignAndroid DevelopmentAndroid developmentBazelBuild SystemBuild System ConfigurationBuild SystemsBuild ToolsC++C++ DevelopmentC++ Standard LibraryC++ build configurationC++20CI/CDCode Cleanup
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