VirtualSpaceList
	
	// Returns a root chunk.
	// Chunk gets one of four colors.
	// Adjusts commit counters. Observes Limits.
	MetaChunk* allocate_root_chunk_space()	


	// purge empty nodes
	void purge();

------------------------------------------------------------------------

ChunkManager

	// 1:1 direct get
	get_chunk(level, preferred_color)

	// get a chunk from the freelist, with allowed tolerance (e.g. return a chunk
	// smaller or larger than level).
	get_fuzzy(level, preferred_color)

	// get a chunk from the freelist, splitting a larger chunk if needed
	split_larger_and_get_chunk(level, preferred_color)

	// Allocate space for a new root chunk from the virtualspacelist
	// split it, add unused parts to freelist
	// return requested chunk
	refill_and_get_chunk(level)

public

	// Uncommit all chunks, depending on size rules. To be called
	// during metaspace gc.
	void uncommit_free_chunks();

	

-------------------------------------------------------------------------

??? :: 




https://ci.sapmachine.io/


https://bit.ly/2Xmi7BT







---------------------

Idea: chunk coloring. Split free chunks into 4 groups, and code preference into ClassLoaderMetaspace





// Counters need to be accessible from both backingSpace and from Metachunk.
class Accountant

	reserved
	commit

	// check limits (MaxMetaspaceSize and GC threshold).
	//  if not even min is possible, returns 0
	//  if min is possible but not preferred, returns min and increases commit counter
	//  if preferred is possible, returns preferred and increases commit counter
	size_t try_inc_committed(size_t min, size_t preferred)
		- all under expand lock

	// check limits (MaxMetaspaceSize and GC threshold).
	//  if not even min is possible, returns 0
	//  if min is possible but not preferred, returns min and increases commit counter
	//  if preferred is possible, returns preferred and increases commit counter
	size_t try_inc_committed_locked(size_t min, size_t preferred)
		- all under expand lock

	void dec_committed(size_t size)
		- all under expand lock

	get_reserved_nolock()
	reserved_lock()

	get_comitted_nolock()
	comitted_lock()


ClassSpaceAccountant
NonClassSpaceAccountant.