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"How does this work? It's just a shell script!" Linux's ftrace facility turns out to be surprisingly capable... and there are a whole load of neat scripts that use it in perf-tools.
to debugging ftrace linux perf performance tracing ... on 14 October 2016
Ftrace: The hidden light switch [LWN.net]
Using Linux's function tracer to investigate a kernel performance problem. I was looking at this again recently because I'd like to know when exactly bash is getting called...
to ftrace kernel linux performance tracing ... on 03 October 2014
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tasty by Adam Sampson.