Storing both "fasttime" and time in Ticks and Tickspan

[Thomas Schatzl]

Hi Kim,

On Tue, 2018-08-28 at 20:36 -0400, Kim Barrett wrote:
> > On Aug 24, 2018, at 8:03 AM, Thomas Schatzl <thomas.schatzl at oracle.
> > com> wrote:
> > 
> > Hi all,

> [...]
> So I think the FastUnorderedElapsedCounterSource and everything
> related to it should be removed.  (I think this includes
> cpu/x86/rdtsc_x86.[ch]pp and UseFastUnorderedTimeStamps.)
> 
> Removing a few milliseconds of sleeping during the initialization of
> this feature is a nice little startup benefit.
> 

  I agree with all that, but I would like to have an opinion from the
JFR team too about this before doing this.

The alternative I can see would be having GC specific Ticks/Tickspan
which I would like to avoid for obvious reasons.

Thanks,
  Thomas