GetMemoryClassSize returns size in bytes for a given memory class.

GetMemoryClassType returns the minimum memory class type that can hold a device of a given size.

PoolAllocator implements a memory allocation strategy similar to buddy-malloc https://github.com/evanw/buddy-malloc/blob/master/buddy-malloc.c We borrow the idea of spanning a tree of fixed size regions on top of a contiguous memory space.

Allocator is an interface for memory allocation.

MappedRegion represents a memory block with an offset.