JDK-8292984 started this clean-up, but there are still cases where cgroupSubsystem-related classes call host/machine specific functions. One example is os::Linux::active_processor_count().

In src/hotspot/os/linux/cgroupSubsystem_linux.cpp I see this code in CgroupSubsystem::active_processor_count:

  cpu_count = os::Linux::active_processor_count();
  result = CgroupUtil::processor_count(contrl->controller(), cpu_count);

The same is true in CgroupUtil::adjust_controller for os::Linux::physical_memory():

  julong phys_mem = static_cast<julong>(os::Linux::physical_memory());
  char* limit_cg_path = nullptr;
  jlong limit = mem->read_memory_limit_in_bytes(phys_mem);

We should clean this up.