[Patch] ParallelGC: Improve AlwaysPreTouch with multiple threads

[stefan.johansson at oracle.com]

Hi Amit,

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Thanks,
Stefan

On 2020-08-20 19:33, amith pawar wrote:
>   Hi,
> 
> Currently AlwaysPreTouch for ParallelGC is done with a single thread and
> this attached patch converts it to multithreaded similar to other GCs.
> 
> All JTREG tests passed without new failures.
> 
> Time taken for pretouch on EPYC server with 1TB memory and 128 threads
> Before fix: ~107 s
> After fix   :  ~14 s
> 
> Please review this attached patch and give your feedback.
> 
> Thanks,
> Amit Pawar
>