[GHC] #8309: traceEvent truncates to 512 bytes

[GHC]

#8309: traceEvent truncates to 512 bytes
-------------------------------------+-------------------------------------
        Reporter:  duncan            |                   Owner:
            Type:  bug               |                  Status:  patch
        Priority:  normal            |               Milestone:
       Component:  Runtime System    |                 Version:  7.6.3
      Resolution:                    |                Keywords:  eventlog
Operating System:  Unknown/Multiple  |  tracing
 Type of failure:  None/Unknown      |            Architecture:
      Blocked By:                    |  Unknown/Multiple
 Related Tickets:  #3874             |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:  Phab:D656
-------------------------------------+-------------------------------------
Changes (by thomie):

 * cc: simonmar (added)
 * status:  new => patch
 * differential:   => Phab:D656
 * related:   => #3874


Comment:

 I made `traceUserMsg` call `postUserMarker` (renamed to `postUserEvent`),
 which does not have the truncation problem.

 See the commit message in Trac #9395 (d360d440) for a discussion about
 using null-terminated strings vs strings with an explicit length. I did
 not make any change here.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8309#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler