The data unit contains raw data such as execution code or data section from memory mapped file.Additionally, they can contain a content of the stack or some meta data such a process descriptor.

• 数据单元中存放的构成进程的相关数据（回忆一下操作系统原理中进程的组成部分：进程描述符，堆栈，把可执行文件载入内存后得到的指令序列和数据区）。