[GHC] #1623: ghci: 20 wakeups per second

[GHC]

#1623: ghci: 20 wakeups per second
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  Reporter:  igloo     |          Owner:         
      Type:  bug       |         Status:  new    
  Priority:  normal    |      Milestone:  6.8    
 Component:  Compiler  |        Version:  6.6.1  
  Severity:  normal    |       Keywords:         
Difficulty:  Unknown   |             Os:  Unknown
  Testcase:            |   Architecture:  Unknown
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From http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=438371 :
 {{{
 According to powertop on my laptop, ghci seems to wake up 20 times per
 second looking for input when sitting at the command prompt.  This has
 negative impact on battery life, as discussed on the powertop page.
 }}}
 I don't think the change in the HEAD to using `timer_create` rather than
 `setitimer` will have fixed this, but I can't currently run powertop so
 haven't been able to confirm that.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1623>
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