priority 1 for "never fork"
maybe we want default priority in the middle... -10 to +10 or somesuch


-- Dynamically adjusting the number of running spmt helpers.

  -- Need some way to decrease the number of running spmt helpers when
     new non-spmt Java parents are created.
     -- background native that manages spmt helper natives
     -- wakes up on Java parent creation and termination
     -- increments/decrements number of running spmt helpers
     
-- Figure out CLHLock details...
  -- allocate 64-byte chunks on native startup and shutdown.
  -- need these for both spmt and non-spmt natives
  -- need to make sure they aren't shared between natives.
  -- okay to free() the memory on shutdown, even though it might not
     be the memory we originally started with.
  -- the natives don't need to know about each other, all transmission
     of pointers is done through the tail field.
    -- tail field needs to go somewhere globally visible.
    -- _svmt_JavaVM struct is a good place.
  -- need a QNode struct
    -- use an _svmt_word field instead of a jboolean
    -- union of jbyte[OPTERON_AMD64_CACHE_LINE_SIZE] and _svmt_word
 
-- bitmapped heap instead of SableVM in object header words

-- don't waste so much time with the callsite and methodcall tables
   (lookups occur at every invoke).

-- maybe use size of allocated memory as a stopping threshold