request, enable perf tools
This tool comes with the kernel, would be nice to have it enabled.
https://packages.debian.org/stretch/linux-perf-4.9
Seems nice development tool (feel free to ignore, as its unstable)
https://packages.debian.org/stretch/perf-tools-unstable
(from redmine: issue id 7178, created on 2017-04-19, closed on 2019-01-10)