Currently some OSContainer functions use direct CGroup V1 implementation details. This should be made more agnostic so as to accommodate for a future CGroup V2-based implementation (See JDK-8230305).

The proposal is dispatch to cgroup version agnostic implementations for the following functions:

  static const char * container_type();
  static jlong memory_limit_in_bytes();
  static jlong memory_and_swap_limit_in_bytes();
  static jlong memory_soft_limit_in_bytes();
  static jlong memory_usage_in_bytes();
  static jlong memory_max_usage_in_bytes();
  static char * cpu_cpuset_cpus();
  static char * cpu_cpuset_memory_nodes();
  static int cpu_quota();
  static int cpu_period();
  static int cpu_shares();

This would allow for support for cgroup v2 without actually changing OSContainer code for those functions.