Improving dynamic update for operating systems

  • Authors:
  • Andrew Baumann;Jonathan Appavoo

  • Affiliations:
  • University of New South Wales;IBM T.J. Watson Research Center

  • Venue:
  • Proceedings of the twentieth ACM symposium on Operating systems principles
  • Year:
  • 2005

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Abstract

Modern operating systems are subject to a constant stream of patches and updates: to fix bugs, improve performance, or add features. Dynamic update offers significantly increased availability for operating systems, and enables administrators to avoid a difficult choice between the cost of down time and the risk of remaining unpatched. However, an operating system kernel is a unique environment for dynamic update; it is generally event-driven, multi-threaded, and involves a high degree of concurrency and asynchrony. It also provides a very restricted runtime environment. Existing dynamic update mechanisms are generally unsuited for use with operating-system code, either because they do not support concurrency [11, 13], require the system to be implemented in a specific language [1, 7, 9], or rely on a higher level of runtime support than is feasible within a traditional OS [5, 6].