[GHC] #13529: eventlog to report more information about stopping threads because of FFI calls

[GHC]

#13529: eventlog to report more information about stopping threads because of FFI
calls
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           Reporter:  varosi         |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  Profiling      |           Version:  8.0.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:  x86_64         |   Type of failure:  None/Unknown
  (amd64)                            |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Currently eventlog file doesn't contain more information about FFI than:

 "stopping thread ### (making a foreign call)"

 It would be very-very useful if we know what actual foreign calls are
 made. For example:

 "stopping thread ### (making a foreign call to function YYYY)

 So we could see which function and how much time is spent on that call.
 If creation of threads because of in-bound foreign calls (callbacks) have
 which callbacks are created for it will be very useful, too.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13529>
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