[$] A look at "BPF Performance Tools"

BPF has exploded within the Linux worldover the last few years, growing from its networking roots into the go-to tool for running customin-kernel programs. Its role seems to expand with every kernel releaseinto diverse areas such as security and device control. But none of thatis the focus of a relatively new book from Brendan Gregg, BPFPerformance Tools; it looks, instead, at how BPF provides visibility intothe guts of the kernel. Finding performance bottlenecks ofvarious sorts on (generally large) production systems is an area where BPFand the tool set that has grown up around it can excel; Gregg's bookdescribes that landscape in great depth.