Playing with the profiler

[Luís Gabriel]

I just did a clean build on top of the current master (I was building on
top of ghc-7.8) and it worked!

Thanks!
--
Luís Gabriel

On Sun Jan 18 2015 at 9:35:35 AM Sergei Trofimovich <slyich at gmail.com>
wrote:

> On Sat, 17 Jan 2015 23:20:30 +0000
> Luís Gabriel <lampih at gmail.com> wrote:
>
> > Hi there,
> >
> > I'm doing some experiments with the GHC time profiler and I need to add a
> > new field to the Cost Centre structures. I managed to add the field in
> the
> > *CCS.h* header as well as in *codeGen/StgCmmProf.hs* but for some reason
> > the program is crashing during garbage collection.
> >
> > As I have no experience with the GHC internals, I'm having trouble to
> find
> > the problem. It would be very nice if someone could give me some clue to
> > find this bug.
> >
> > The patch on GHC as well as the test sample and stack traces can be found
> > here: https://gist.github.com/luisgabriel/39d51cf4d661c7e62e22
>
> I tried your patch as-is on current ghc-HEAD/amd64 and it works fine.
> (might easily be another problem)
>
> What I am suspicious about is you are using
>     '-prof -debug' and plain 'ghc'.
>
> Could it be that you didn't add
>     GhcRTSWays += debug_p
> in your build.mk after a patch was tweaked last time
> and some old runtime against new ghc was used?
>
> I usually use inplace/bin/ghc-stage2 right
> after compilation without installation.
>
> --
>
>   Sergei
>
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