public static void writeByte(long addr, byte value) {
    unsafe.putByte(addr, value);
  }
This class supports allocating and freeing large amounts of addressable memory (i.e. slabs). It
also supports using an "address" to operate on the memory. Note that this class's implementation
is currently a singleton so all the methods on it are static.
geode-core/src/main/java/org/apache/geode/internal/offheap/AddressableMemoryManager.java