[Go] instrumentation

Reference:
GopherCon 2019: Jason Keene - Dynamically Instrumenting Go Programs
http://www.brendangregg.com/blog/2016-03-05/linux-bpf-superpowers.html

Book:
BPF Performance Tools

Probe Effect (be aware)

Types of instrument:

• Static and Always ON
  Logging, metrics, distributed tracing
• Static and Requires Activation
  Leveled logging, pprof, usdt probes( https://lwn.net/Articles/753601 )
• Dynamic Instrumentation
  Debuggers, tracers, uprobes/bpf

Streetlight Effect (where static trace is ON, be aware)

Thus we need dynamic instrumentation.

1. ptrace/debuggers
   GDB ( http://vsdmars.blogspot.com/2018/10/clinux-debugging.html )
2. go-bpf
   https://github.com/iovisor/gobpf