[GHC] #14492: Tiered memory allocation restricts available memory

[GHC]

#14492: Tiered memory allocation restricts available memory
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        Reporter:  unode             |                Owner:  bgamari
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Runtime System    |              Version:  8.0.2
      Resolution:                    |             Keywords:  memory ulimit
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Poor/confusing    |  (amd64)
  error message                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4215
       Wiki Page:                    |
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Comment (by luispedro):

 Just to ping everyone on this. We are still having to over allocate memory
 on our servers to work around this bug, while the simple 1-liner above
 (`*len -= *len/8`) would get us a 90% solution.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14492#comment:11>
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