RFR: 8140393: Move WorkerDataArray to its own file

[Erik Helin]

All,

I've split the patch into two patches in order to ease the reviewing (I
still indend to push this as one change). The first patch changes the
current implementation of the class WorkerDataArray, particularly
removing the caching mechanism. The second patch just shuffles code
around into new files (and also adds some basic tests).

Webrevs:
- Step 1: http://cr.openjdk.java.net/~ehelin/8140393/webrev.01-1/
- Step 2: http://cr.openjdk.java.net/~ehelin/8140393/webrev.01-2/

Thanks,
Erik

On 2015-10-26, Erik Helin wrote:
> Hi all,
> 
> this patch moves the class WorkerDataArray into its own file. While
> moving to the code, I also refurbished it a bit. WorkerDataArray used
> to cache the results for calls to max(), min(), sum() etc because it
> might be expensive too loop over the array. However, the array we are
> iterating over will at most be as big as the number of GC threads (it is
> very rare to use more than 1000 GC threads). Performance runs shows no
> regressions at all, so I prefer to go with the simpler code.
> 
> Enhancement:
> https://bugs.openjdk.java.net/browse/JDK-8140393
> 
> Webrev:
> http://cr.openjdk.java.net/~ehelin/8140393/webrev.00/
> 
> Testing:
> - JPRT
> - Perf Aurora for performance regressions
> 
> Thanks,
> Erik