They also forked Android to do similar profiling improvement [1] and even wrote a paper on that [2]. It's an impressive achievement and I hope they tried to upstream it as well.

The Android ART profiler today is still kinda limited (too high overhead or too imprecise) so we tend to switch over to simpleperf [3]. However I think there are things that only in-langue profilers can do.

  [1] https://eng.uber.com/nanoscope/
  [2] https://2018.splashcon.org/details/vmil-2018/9/Profiling-Android-Applications-with-Nanoscope
  [3] https://developer.android.com/ndk/guides/simpleperf