[$] BPF: what's good, what's coming, and what's needed

The 2019 Linux Storage, Filesystem, and Memory-Management Summit differedsomewhat from its predecessors in that it contained a fourth trackdedicated to the BPF virtual machine. LWN was unable to attend most ofthose sessions, but a couple of BPF-related talks were a part of thebroader program. Among those was a plenary talk by Dave Miller, describedas "a wholistic view" of why BPF is successful, its current state, andwhere things are going.