[LINUX] [$] Improving pseudo filesystems

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The eventfs filesystem provides an interface to the tracepoints that are available to be used by various Linux tracing tools (e.g. ftrace, perf, uprobes, etc.); it is meant to be a version of the tracefs filesystem that dynamically allocates its entries as needed. The goal is to reduce the memory required for multiple instances of tracefs, as Steven Rostedt described in a session at the 2022 Linux Storage, Filesystem, Memory Management, and BPF Summit. He returned to the 2024 edition of the summit to talk further about how to make pseudo (or virtual) filesystems, such as tracefs/eventfs, more like regular Linux filesystems, where the directory entries (dentries) and inodes are only created (and cached) as needed.

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