[$] AutoFDO and Propeller

Rong Xu andHan Shen described the kernel-optimization techniques that Google uses in the toolchainstrack at the 2024 LinuxPlumbers Conference.They talked about automaticfeedback-directed optimization (AutoFDO), which can be used with the Propelleroptimizer to produce kernels with better performance using profileinformation gathered from real workloads. There is a fair amount ofoverlap between these tools and the BOLTpost-link optimizer, which was the subject of a talk that directly preceded this session.