[GHC] #3021: A way to programmatically insert marks into heap profiling output

[GHC]

#3021: A way to programmatically insert marks into heap profiling output
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    Reporter:  SamB              |        Owner:                  
        Type:  feature request   |       Status:  new             
    Priority:  normal            |    Milestone:                  
   Component:  Profiling         |      Version:  6.10.1          
    Severity:  normal            |   Resolution:                  
    Keywords:  profiling         |   Difficulty:  Unknown         
    Testcase:                    |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |  
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Comment (by malcolm.wallace at cs.york.ac.uk):

 Ah, we have it in module NonStdProfile (non-hierarchical, since it
 predates that extension).  But if you have a better idea of where it
 should live, I'll happily change nhc98 to match.  Where does "trace" live?
 Would System.IO.Unsafe be a good place?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3021#comment:8>
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