[GHC] #8504: Provide minor GC residency estimates

[GHC]

#8504: Provide minor GC residency estimates
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        Reporter:  ezyang      |            Owner:  simonmar
            Type:  feature     |           Status:  new
  request                      |        Milestone:
        Priority:  lowest      |          Version:  7.7
       Component:  Runtime     |         Keywords:  easy
  System                       |     Architecture:  Unknown/Multiple
      Resolution:              |       Difficulty:  Easy (less than 1 hour)
Operating System:              |       Blocked By:
  Unknown/Multiple             |  Related Tickets:
 Type of failure:              |
  None/Unknown                 |
       Test Case:              |
        Blocking:              |
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Comment (by simonmar):

 I'm not against having a higher resolution but lower accuracy residency
 sample, but it should be something that has to be requested explicitly (I
 presume your patch above isn't a serious proposal, but just to be clear I
 don't think it would be a good idea to apply it!).

 The residency you'll see by using the figures from minor collections is
 the saw-tooth generational GC pattern.  That's fine if you understand why,
 but we don't want to give users the mistaken impression that their
 programs have a saw-tooth heap profile.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8504#comment:1>
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