[$] A look at "BPF Performance Tools"
BPF has exploded within the Linux world
over the last few years, growing
from its networking roots into the go-to tool for running custom
in-kernel programs. Its role seems to expand with every kernel release
into diverse areas such as security and device control. But none of that
is the focus of a relatively new book from Brendan Gregg, BPF
Performance Tools; it looks, instead, at how BPF provides visibility into
the guts of the kernel. Finding performance bottlenecks of
various sorts on (generally large) production systems is an area where BPF
and the tool set that has grown up around it can excel; Gregg's book
describes that landscape in great depth.