Linux systems can have large filesystems; trying to keep up with the
stream of
fanotify filesystem-monitoring notifications for them can be a struggle. Fanotify is one of a few ways to monitor accesses to filesystems provided by the kernel.
Song Liu led a discussion
on how to improve in-kernel filtering of fanotify events to a joint
session of the filesystem and BPF tracks at the 2025 Linux Storage, Filesystem, Memory-Management, and BPF Summit. He wants to combine the best parts of a few different approaches to efficiently filter filesystem events.
https://lwn.net/Articles/1018493/
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