[$] The state of system observability with BPF

The 2019 version of the Linux Storage, Filesystem, and Memory-ManagementSummit opened with a plenary talk by Brendan Gregg on observing the stateof Linux systems using BPF. It is, he said, an exciting time; theBPF-based "superpowers" being added to the kernel are growing in capability andmaturity. It is now possible to ask many questions about what is happeningin a production Linux system without the need for kernel modifications oreven basic debugging information.