RFR: 8252104: parallel heap inspection for ShenandoahHeap [v3]

[Zhengyu Gu]

On Sat, 12 Sep 2020 00:17:58 GMT, Lin Zang <lzang at openjdk.org> wrote:

>> - enable parallel heap inspecton for ShenandoahHeap
>>   - preliminary evaluation:
>>     Time of jmap histo on (8GB heap with 4GB objects)
>>     * before: 5.186s
>>     * after : 1.698s
>
> Lin Zang has refreshed the contents of this pull request, and previous commits have been removed. The incremental views
> will show differences compared to the previous content of the PR. The pull request contains one new commit since the
> last revision:
>   8252104: parallel heap inspection for ShenandoahHeap
>   
>     - enable parallel heap inspecton for ShenandoahHeap
>     - preliminary evaluation:
>       Time of jmap histo on (8GB heap with 4GB objects)
>       * before: 5.186s
>       * after : 1.698s

Marked as reviewed by zgu (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/67