Computer Science 322
Operating Systems

Mount Holyoke College
Spring 2008

Lecture 21: Memory Management: Paging
Date: Friday, April 4, 2008

Agenda

Announcements
- Reminder: our second exam is scheduled for April 14-16.
Lecture assignment recap
Memory management
- Contiguous allocation
  - hardware support: limit and base/relocation registers
  - first-fit/best-fit/worst-fit
- Fragmentation
  - external: waste between allocated chunks
  - internal: waste within allocated chunks
  - reduce external fragmentation with a compaction operation
- Paging
  - break up logical memory into pages, physical memory into frames
  - page size: the size of these pages/frames
  - can allow virtual memory

Lecture Assignment

No new lecture assignment for Monday. Wrap up your shells if you have not already done so!