[GHC] #13830: '+RTS -s' gives incorrect value for work balance in some cases

[GHC]

#13830: '+RTS -s' gives incorrect value for work balance in some cases
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           Reporter:  duog           |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Runtime        |           Version:  8.0.1
  System                             |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Debugging
  Unknown/Multiple                   |  information is incorrect
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 The formula for work balance as printed by the rts -s flag does not
 account for the possibility of the number of capabilities changing. Nor
 does it account for the number of garbage collection threads being other
 than n_capabilities.  The attached program demonstrates the first problem,
 with instructions for replication in comments.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13830>
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