sclass AllThreadsProfiler extends AbstractProfiler {
  toString {
    ret shortClassName(this);
  }

  void stepImpl() {
    Map<Thread, StackTraceElement[]> map = runnableThreadsWithStackTraces();
    lock lock;
    samples++;
    for (t, stackTrace : map)
      if (!isSystemThread(t))
        addSample(stackTrace);
  }
}

Began life as a copy of #1035050