[GHC] #7300: Allow CAFs kept reachable by FFI to be forcibly made unreachable for GC

[GHC]

#7300: Allow CAFs kept reachable by FFI to be forcibly made unreachable for GC
---------------------------------+------------------------------------------
    Reporter:  absence           |       Owner:                         
        Type:  feature request   |      Status:  new                    
    Priority:  high              |   Milestone:  7.8.1                  
   Component:  Compiler (FFI)    |     Version:  7.4.1                  
    Keywords:  unsafe caf gc     |          Os:  Unknown/Multiple       
Architecture:  Unknown/Multiple  |     Failure:  Runtime performance bug
  Difficulty:  Unknown           |    Testcase:                         
   Blockedby:                    |    Blocking:                         
     Related:                    |  
---------------------------------+------------------------------------------
Changes (by simonmar):

  * priority:  normal => high
  * difficulty:  => Unknown
  * milestone:  => 7.8.1


Comment:

 Thanks for making a ticket.

 What I had in mind (to remind myself) is that we expose a C API from the
 RTS that would revert all the live CAFs.  This would have to be done at
 the same time as a major GC, because that is the only time that we can
 visit all the live CAFs.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7300#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler