Operating systems notes
Memory Without Abstraction
Before virtual memory: what happens when programs run on raw physical addresses, and why it could not last. Every section is a drawn page beside a clear written explanation, about 15 minutes in all.
- Chapter 20 of 37
- About 15 minutes
- 7 sections
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In this chapter
- The simplest model: one program, all the RAM
- The problems with raw physical addressing
- Running multiple programs: fixed partitions
- Base and limit registers
- Swapping: when programs don’t all fit
- Fragmentation: holes and waste
- Why this had to change, and where we’re headed
Next chapters
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