Virtual Memory
Page tables (PTs) revisited ...
- a virtual address space with K pages needs K PT entries
- since K may be large, do not want to store whole PT
- especially since working set tells us n < K needed at once
Alternative strategy: multi-level page tables
Effective because not all pages in virtual address space are required
(e.g. the pages between the top of the heap and the bottom of the stack)
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