Chad Salinas Operating Systems

Chad Salinas Operating Systems 2

Chad Salinas — Sat, 10 Jan 2009 05:12:26 +0000

How do you determine what state is associated with a process?

How can fork() or execve(…) be used?

Dump uses fork() to rewind.

How do you reduce a process’ privledges?

Contrast fork() with spawning i.e. Windows’ CreateProcess() with 10 args.

What is the function of the Process Control Block (PCB)?

Scheduling Issues(5)

Fairness
Priority
Deadlines
Throughput
Efficiency

Kernel calculates priority for preemption - then context switch based on multiple parms.

What optimizations can be made to make context switches less expensive?

What are the differences between threads and processes?

What are the disadvantages of kernel threads?

CS/EE Abstraction Hierarchy

Chad Salinas — Thu, 08 Jan 2009 04:18:41 +0000

Abstraction hides complexity

Algorithms
C, C++, Java, Python…
Instruction Set Architecture
Functional Units
Logic Gates
Transistors
Electrons

Chad Salinas EE Bag of Tricks

Chad Salinas — Thu, 08 Jan 2009 03:31:30 +0000

EE bag of tricks useful for Operating Systems

Pipelining
Parallelism
Caching
Indirection
Amortization
Out-of-order execution
Speculation

OS Opening

Chad Salinas — Fri, 05 Dec 2008 06:04:12 +0000

1. Put this value in a register.
2. Device does DMA and raises an interrupt

How is your hardware functioning?
How much concurrent programming is involved?
Cover OS evolution.
Protection Mechanisms, i.e. pre-emption
Interposition
Privileged vs. Unprivileged
Protecting CPU
Protecting Memory
Don’t do this: int main() { while(1) fork(); }

Chad Salinas Operating Systems

Chad Salinas Operating Systems 2

CS/EE Abstraction Hierarchy

Chad Salinas EE Bag of Tricks

OS Opening

Overview

Project 1: Threads

Project 2: Multiprogramming

Project 3: Virtual Memory

Project 4: File Systems