Extension trait for external crates to implement which provides start/stop hooks when profiling (but not when benchmarking) functions.
fn start_profiling(&mut self, benchmark_id: &str, benchmark_dir: &Path)
This function is called when Criterion.rs starts profiling a particular benchmark. It provides the stringified benchmark ID and a path to a directory where the profiler can store its data.
fn stop_profiling(&mut self, benchmark_id: &str, benchmark_dir: &Path)
This function is called after Criterion.rs stops profiling a particular
benchmark. The benchmark ID and directory are the same as in the call
start, provided for convenience.