Taming the Effects of Compiler Optimizations on BPF Tracing

Explore the challenges and potential solutions for BPF tracing programs affected by compiler optimizations in this Linux Plumbers Conference talk. Dive into the complexities of BPF Compile Once - Run Everywhere (CO-RE) and its impact on kernel observability. Learn how compiler optimizations can lead to functions disappearing from BPF Type Format (BTF), making them difficult to trace. Discover the issues arising from maintaining BPF tracing programs across kernel versions, including changes in function names and loss of tracing capabilities. Examine a proposed solution to address these problems and improve the reliability of BPF tracing across different kernel versions and compiler updates.