[GHC] #14660: Improve +RTS -t --machine-readable

[GHC]

#14660: Improve +RTS -t --machine-readable
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        Reporter:  duog              |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Runtime System    |              Version:  8.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by duog):

 Using a JSON record would break existing tooling, which is a little on the
 nose since this output has been documented as being forwards compatible.

 It would be good to have a nice structured record for the per-generations
 stats though.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14660#comment:2>
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