[GHC] #8732: Global big object heap allocator lock causes contention

[GHC]

#8732: Global big object heap allocator lock causes contention
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        Reporter:  tibbe                    |            Owner:  simonmar
            Type:  bug                      |           Status:  new
        Priority:  normal                   |        Milestone:  7.10.1
       Component:  Runtime System           |          Version:  7.6.3
      Resolution:                           |         Keywords:
Operating System:  Unknown/Multiple         |     Architecture:
 Type of failure:  Runtime performance bug  |  Unknown/Multiple
       Test Case:                           |       Difficulty:  Unknown
        Blocking:                           |       Blocked By:
                                            |  Related Tickets:
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Comment (by tibbe):

 > But you have to be careful: objects that are larger than a block need
 contiguous blocks, so unless you are only going to enable this for large
 objects that still fit in a single block, you'll have to maintain multiple
 lists with the sizes you want.

 I think malloc already does that, so we could copy whatever they do
 perhaps.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8732#comment:4>
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