1. If a struct is a field of heap allocated object, it will be allocated and garbage collected. Only if it only exists on stack (i.e., in method body), GC is not used.
As far as I can tell, it won't be allocated on it's own, since it is stored in the garbage collected object as a value field. So using a freelist would actually increase the overhead. You have to manage the freelist and do the allocation of the containing object.
