Address space

The address space of a process usually consists of three segments

• Stack
• Data
• Code

Typically, stack and data segments are dynamic.

Address space abstracts physical memory in the following three ways:

• Address independence: Each process has its own memory
• Protection: that only it can access
• Virtual memory: that is large

Multiprogramming allows multiple processes in memory at a time. This is motivated by the observation that most processes would only require a small bit of memory at a time.