In-class notes for 10/23/2019 (CS 273 (OS), Fall 2019)

______ In-class notes for 10/23/2019 (CS 273 (OS), Fall 2019)

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In-class notes for 10/23/2019

CS 273 (OS), Fall 2019

HW9 due today. Questions?
HW10 due Friday.
- Tasks A-F of project development
  - Tasks A-J are now available, as well as Tasks Q and R. (Feedback welcome...)
- Review questions
Upcoming: implementation of memory management in the kernel; file systems

Paging (Virtual Memory)

Page replacement algorithms
Exercise (at the board)

Assume 8 page frames, two processes with pages A1, A2, ... and B1, B2, ...
How many page faults are needed for
```
A1    A2    A3    A4    A1    A2    A3    A4  
  \  /  \  /  \  /  \  /  \  /  \  /  \  /  \
   B1    B2    B1    B3    B1    B4    B1    B2
```
for FIFO? For NRU? (here, boldface indicates modification of a page)
Segmented memory

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