[GHC] #645: Make tick interval configurable

[GHC]

#645: Make tick interval configurable
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  Reporter:  simonmar        |          Owner:         
      Type:  task            |         Status:  new    
  Priority:  normal          |      Milestone:  6.6    
 Component:  Runtime System  |        Version:  6.4.1  
  Severity:  normal          |     Resolution:         
  Keywords:                  |             Os:  Unknown
Difficulty:  Easy (1 hr)     |   Architecture:  Unknown
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Comment (by simonmar):

 Here's a patch I knocked up a while ago, largely untested but might be
 useful as a starting point.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/645>
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