Operating Systems 2017F Lecture 22

Video

Lecture 22 Video

Notes

In Class

Lecture 22
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What's left?

* scheduling
* device drivers
* virtual memory
  - page replacement algorithms
    - predict the future (optimal)
    - least recently used
    - one-handed, two-handed clocks
* power management
* security
  - hardening processes so coding errors don't lead to vulnerabilities
    (machine code injection, e.g. buffer overflow attacks)

* virtualization
  - hardware-level  (run multiple kernels)  <-- vmware, openstack
  - OS-level        (run multiple userspaces) <-- containers, web hosting
  - application level (run programs on simulated machines)
     - JVM
     - JavaScript runtime in browsers/node
 
* distributed operating systems