Motohiro Kosaki
Technical Advisor at Ruby Association
Osaka, Japan
Summary
🤩
Rockstar🎓
Top SchoolMotohiro Kosaki is a seasoned systems engineer and technical advisor in Osaka with 26 years of experience focused on low-level infrastructure, Linux memory management, and language runtime internals. A longtime Ruby core committer and one of the top Linux MM developers, he has led major rewrites (including Ruby's GVL and parts of the Linux VM) and driven platform tuning for HPC and container work. He serves as a Fujitsu Distinguished Engineer and technical advisor to multiple companies while running his own consulting practice, bridging research, product, and open-source communities. Notably, his kernel contributions include hugepage support and core-dump enhancements, and his prolific activity in the ruby and linux trees reflects deep, sustained influence on two foundational ecosystems.
26 years of coding experience
23 years of employment as a software developer
Master's degree, Management of Technology, Master's degree, Management of Technology at Tokyo University of ScienceBS, mathematics, physics, BS, mathematics, physics at Kinki University
Japanese, English
Github Skills (10)
c1710
kernel10
memory-management10
c1110
system-programming10
linux-kernel10
kernel-mode10
virtual-memory10
debug9
debugging9
Programming languages (8)
Github contributions (5)
jonsmirl/mpc5200
Feb 2008 - Jun 2011
Digispeaker
Role in this project:
Back-end Developer
Back-end DeveloperContributions:241 commits in 3 years 4 months
Contributions summary:Motohiro primarily contributed to the memory management subsystem of the Linux kernel. Their work focused on optimizing memory allocation and deallocation, including improvements to the page cache and virtual memory management. They refactored and removed unused functions related to the LRU (Least Recently Used) cache, further streamlining the kernel's memory management. The user also implemented features related to hugepage support and the core dump mechanism, enhancing the system's capabilities.
kosaki/colordiff.py
May 2009 - Jun 2016
Contributions:3 commits, 1 PR, 1 push in 7 years 1 month
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