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Memory management in fault tolerant computer systems utilizing a first and second recording mechanism and a reintegration mechanism

  • US 5,953,742 A
  • Filed: 07/01/1996
  • Issued: 09/14/1999
  • Est. Priority Date: 07/01/1996
  • Status: Expired due to Term
First Claim
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1. A memory management system for a fault tolerant computer system, said memory management system comprising:

  • a first recording mechanism which can be activated to record memory update events;

    a fault input for a fault signal to activate said first recording mechanism in the event of a fault event;

    a second recording mechanism having a capacity to record at least a limited number of memory update events, and to maintain a record of recent memory update events up to a number sufficient to cover the time to activate said first recording mechanism following said fault event, said second recording mechanism comprises a first-in-first-out buffer, an output of said first-in-first-out buffer is connected to said first recording mechanism, and further said first-in-first-out buffer stores up to a predetermined number of update addresses, an address decoder is connected to said output of said first-in-first-out buffer to generate a page signal representative of a memory update address output from said first-in-first-out buffer and said address decoder is responsive to said fault signal to pass said page signal to said first recording mechanism; and

    a memory reintegration mechanism to reintegrate at least parts of memory identified in said first and second recording mechanisms.

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