Keeping Track of Duplicates

• When a page goes from singlet to duplicate:

  • Happens during a forward, so this is trivial. (no additional messages)

• When a page goes from duplicate to singlet:

  • Owner receives a message that a page was evicted.
  • If only one copy remains, owner sends a message to that server.
  • message can be piggy backed. (no additional messages)

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