Notes: Operative Systems – Part 10

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NOTIFICATION: These notes are published for educational purposes. Using these notes is under your own responsibility and risk. These notes are given ‘as is’. I do not take responsibilities for how you use them.

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  • I/O handling
  • Shareable versus dedicated devices
  • Programmed I/O
  • Interrupt-driven I/O
  • DMA I/O
  • I/O software layers
  • Device drivers
  • Disk arm scheduling algorithm
  • Elevator (SCAN) algorithm

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Notes: Operative Systems – Part 6

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NOTIFICATION: These notes are published for educational purposes. Using these notes is under your own responsibility and risk. These notes are given ‘as is’. I do not take responsibilities for how you use them.

PDF Content:

  • Least recently used  (LRU) page replacement algorithm
  • Not frequenty used (NFU) algorithm
  • Aging (approximation of LRU) algorithm
  • Working set
  • Current virtual time
  • Page replacement algorithm
  • Clock page replacement algorithm
  • WSClock page replacement algorithm
  • Local vs. Global replacement policies
  • Internal vs. External fragmentation
  • Page size
  • Periodic cleaning policy
  • Thrashing
  • Separation of policy and mechanism
  • Concurrency vs. parallelism
  • Critical sections

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