[GHC] #14257: Heap profiling with ghc and hp2ps and strict function application ($!) gives samples out of sequence (regression)

[GHC]

#14257: Heap profiling with ghc and hp2ps and strict function application ($!)
gives samples out of sequence (regression)
-------------------------------------+-------------------------------------
        Reporter:  carlostome        |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.4.1
       Component:  Runtime System    |              Version:  8.2.1
      Resolution:                    |             Keywords:  profiler
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14006, #11645    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by duog):

 I had a little look at this. The description in comment:2 looks right to
 me, except that I think ALL censuses are using stale stats.gc.cpu_ns
 values. I moved the `stats_endGC` call before the `heapCensus` call in
 phab:D4183, and this issue seems to be fixed. Of course it's quite hard to
 tell that this doesn't break something else.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14257#comment:8>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler