perf-event2 is used at run time in 4 crates (of which 3 optionally). It's used only as a dev dependency in 1 crate.

Depender (with downloads and own rev deps) perf-event2 version
4.8K 2 shumai optional ^0.7.4
rezolus ^0.7.4
quick_perf_event ^0.7.4
future-profiler optional ^0.7