Chapter 1: Introduction



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Kernel Data Structures

  • Many similar to standard programming data structures
  • Singly linked list
  • Doubly linked list
  • Circular linked list

Kernel Data Structures

  • Binary search tree left <= right
    • Search performance is O(n)
    • Balanced binary search tree is O(lg n)

Kernel Data Structures

  • Hash function can create a hash map
  • Bitmap – string of n binary digits representing the status of n items
  • Linux data structures defined in
  • include files , ,

Computing Environments - Traditional

  • Stand-alone general purpose machines
  • But blurred as most systems interconnect with others (i.e., the Internet)
  • Portals provide web access to internal systems
  • Network computers (thin clients) are like Web terminals
  • Mobile computers interconnect via wireless networks
  • Networking becoming ubiquitous – even home systems use firewalls to protect home computers from Internet attacks

Computing Environments - Mobile

  • Handheld smartphones, tablets, etc
  • What is the functional difference between them and a “traditional” laptop?
  • Extra feature – more OS features (GPS, gyroscope)
  • Allows new types of apps like augmented reality
  • Use IEEE 802.11 wireless, or cellular data networks for connectivity
  • Leaders are Apple iOS and Google Android

Computing Environments – Distributed

  • Distributed computiing
    • Collection of separate, possibly heterogeneous, systems networked together
      • Network is a communications path, TCP/IP most common
        • Local Area Network (LAN)
        • Wide Area Network (WAN)
        • Metropolitan Area Network (MAN)
        • Personal Area Network (PAN)
    • Network Operating System provides features between systems across network
      • Communication scheme allows systems to exchange messages
      • Illusion of a single system

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