[GHC] #881: Improve space profiling for references

[GHC]

#881: Improve space profiling for references
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 Reporter:  simonpj          |          Owner:         
     Type:  feature request  |         Status:  new    
 Priority:  normal           |      Milestone:  _|_    
Component:  Profiling        |        Version:  6.4.2  
 Severity:  normal           |     Resolution:         
 Keywords:                   |     Difficulty:  Unknown
 Testcase:                   |   Architecture:  Unknown
       Os:  Unknown          |  
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Comment (by SamB):

 Isn't the problem here that the retainer profiling is stopping at the
 IORef and writing the memory off as retained by "SYSTEM", when it should
 go back and find out who retains the IORef?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/881#comment:3>
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