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    Nowhere in the article or on that website is “BPF” defined. I found this page with a definition: Linux Journal – BPF For Observability: Getting Started Quickly.

    BPF is a verified-to-be-safe, fast to switch-to, mechanism, for running code in Linux kernel space to react to events such as function calls, function returns, and trace points in kernel or user space.

    According to that page, BPF was originally an acronym for Berkeley Packet Filter, but is now the whole name of the technology.