[GHC] #4225: RTS option to remove profiling overhead from heap profile time stamps

[GHC]

#4225: RTS option to remove profiling overhead from heap profile time stamps
---------------------------------+------------------------------------------
    Reporter:  ClaudiusMaximus   |       Owner:              
        Type:  feature request   |      Status:  new         
    Priority:  normal            |   Component:  Profiling   
     Version:  6.12.3            |    Keywords:              
          Os:  Unknown/Multiple  |    Testcase:              
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown
---------------------------------+------------------------------------------

Comment(by ClaudiusMaximus):

 In the attached graph "i1.png", you can see that the sample times as
 recorded in the .hp file are not uniform (they seem to measure "real time"
 or "program time" instead of "non-profiling program time").  So I guess
 the "removing overheads of profiling" property is indeed broken.

 {{{
 $ ghc --version
 The Glorious Glasgow Haskell Compilation System, version 6.12.3
 $ uname -a
 Linux zebimus 2.6.32-24-generic #38-Ubuntu SMP Mon Jul 5 09:20:59 UTC 2010
 x86_64 GNU/Linux
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4225#comment:2>
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