[GHC] #2140: cpuTimePrecision is wrong

[GHC]

#2140: cpuTimePrecision is wrong
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        Reporter:  guest             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  lowest            |            Milestone:
       Component:  Core Libraries    |              Version:  6.8.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Documentation     |  Unknown/Multiple
  bug                                |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 > But maybe we should just give up, since CPUTime is not part of the
 Haskell report anymore. Keep the function cpuTimePrecision for backward
 compatibility, but change the docstring to say what it really does: return
 the number of picoseconds between clock ticks.

 This sounds reasonable to me.

 For the record, I believe the relevant Linux interface here is
 `clock_getres` (which itself only has nanosecond resolution at best).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2140#comment:19>
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