OpenXiangShan/XiangShan
Jan 2025 – Jul 2026
3 Months active
Languages Used
MakefileScala
Technical Skills
Cache Coherence ProtocolsCode Ownership ManagementHardware DesignSubmodule ManagementSystem ArchitectureCPU Architecture
Zifei Zhang
PROFILE
Zifei Zhang
Worked on the OpenXiangShan/XiangShan repository, focusing on system architecture, cache coherence protocols, and repository governance. Delivered upgrades to the cache subsystem, including CHI Issue C support and DataCheck features, using Scala and Makefile to enhance data integrity and memory subsystem robustness. Addressed pipeline performance by fixing instruction fusion stalls, improving throughput and aligning stall logic with runtime behavior. Managed code ownership realignment for both MMU and backend modules, streamlining pull request routing and review efficiency. Emphasized maintainability and reliability through submodule management and clear ownership tracking, contributing to more predictable latency and efficient development workflows across hardware design components.
Overall Statistics
Feature vs Bugs
75%Features
Repository Contributions
4Total
Bugs
1
Commits
4
Features
3
Lines of code
191
Activity Months3
Your Network
64 peopleSame Organization
@mails.ucas.edu.cn2
Work History
July 2026
1 Commits • 1 Features
Jul 1, 2026July 2026 | OpenXiangShan/XiangShan: Implemented backend ownership realignment to streamline PR routing and improve governance for backend changes. Reassigned CODEOWNERS from @lewislzh to @Lemover and designated @Lemover as the owner for the yunsuan directory, ensuring correct review coverage and faster PR cycles. This change lays groundwork for clearer accountability and more efficient code reviews across backend components.
1 Commits • 1 Features
Jul 1, 2026July 2026 | OpenXiangShan/XiangShan: Implemented backend ownership realignment to streamline PR routing and improve governance for backend changes. Reassigned CODEOWNERS from @lewislzh to @Lemover and designated @Lemover as the owner for the yunsuan directory, ensuring correct review coverage and faster PR cycles. This change lays groundwork for clearer accountability and more efficient code reviews across backend components.
July 2026
March 2025
1 Commits
Mar 1, 2025Concise monthly summary for 2025-03 focusing on the OpenXiangShan/XiangShan repository. Delivered a targeted pipeline crash/stall fix to improve throughput and reliability in the critical instruction fetch/decode path. The fix ensures fused instructions are treated as NoStall, aligning stall reasoning with actual runtime behavior and reducing unnecessary stalls in the pipeline.
March 2025
1 Commits
Mar 1, 2025Concise monthly summary for 2025-03 focusing on the OpenXiangShan/XiangShan repository. Delivered a targeted pipeline crash/stall fix to improve throughput and reliability in the critical instruction fetch/decode path. The fix ensures fused instructions are treated as NoStall, aligning stall reasoning with actual runtime behavior and reducing unnecessary stalls in the pipeline.
January 2025
2 Commits • 2 Features
Jan 1, 2025Month: 2025-01. Focus: governance and performance improvements in OpenXiangShan/XiangShan. Primary deliverables this month were governance and cache subsystem upgrades that drive maintainability and reliability. Business value: clearer ownership accelerates code reviews and reduces review friction; submodule upgrades unlock advanced cache features and robustness for the memory subsystem, improving overall system stability and performance.
2 Commits • 2 Features
Jan 1, 2025Month: 2025-01. Focus: governance and performance improvements in OpenXiangShan/XiangShan. Primary deliverables this month were governance and cache subsystem upgrades that drive maintainability and reliability. Business value: clearer ownership accelerates code reviews and reduces review friction; submodule upgrades unlock advanced cache features and robustness for the memory subsystem, improving overall system stability and performance.
January 2025
Activity
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Quality Metrics
Correctness95.0%
Maintainability90.0%
Architecture90.0%
Performance90.0%
AI Usage25.0%
Skills & Technologies
Programming Languages
MakefileScala
Technical Skills
CPU ArchitectureCache Coherence ProtocolsCode Ownership ManagementGitHubHardware DesignPipeline OptimizationRepository ManagementSubmodule ManagementSystem Architecture
Repositories Contributed To
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