How Linux BPF Iterators Make Kernel Data Accessible

In this episode of The Linux Podcast with Fexingo, Lucas and Luna explore how Linux BPF iterators simplify kernel data access. They trace a concrete example: using BPF iterators to dump all open files across the system, something that traditionally required writing kernel modules or parsing procfs. The conversation covers how iterators differ from classic BPF programs, the role of the iterator context, and why they matter for observability and security tooling. They also discuss the performance trade-offs and practical use cases, like tracking file descriptors for a container. If you've ever wondered how tools like bpftool or systemtap work under the hood, this episode gives you a clear, technical picture without drowning in code. Tune in for a focused, practical look at a powerful Linux feature.

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