[$] Tracepoints for the VFS?

Adding tracepoints to some kernel subsystems has been controversial—or
disallowed—due to concerns about the user-space
ABI that they might create. The virtual filesystem (VFS) layer has
long been one of the subsystems that has not allowed any tracepoints, but
that may be changing. At the 2025 Linux Storage, Filesystem, Memory
Management, and BPF Summit (LSFMM+BPF), Ted Ts'o led a discussion about
whether the ABI concerns are outweighed by the utility of tracepoints for
the VFS.