New Patches Work to Optimize Code Generation for Linux Context Switching
12 days ago
- #Context Switching
- #Linux
- #Performance Optimization
- Xie Yuanbin posted three patches to optimize compiler code generation during context switching in Linux.
- The patches focus on modifying inline attributes of functions without changing code logic to improve performance.
- Key issue identified: finish_task_switch() is not inlined at O2 optimization, impacting performance due to its position in a hot code path.
- Modern CPU vulnerabilities and mitigations (e.g., Spectre V2) exacerbate performance degradation during context switching.
- Performance improvements: 11% drop in context switch time on Intel CPUs, 44% with Spectre V2 mitigations; 8% and 35% improvements for LLVM Clang-built kernels.
- The patches aim to make functions called during context switching always inline to mitigate performance issues.