RFR: 8252104: parallel heap inspection for ShenandoahHeap

[Lin Zang]

On Tue, 8 Sep 2020 06:48:03 GMT, Aleksey Shipilev <shade 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
>
> Thanks, this looks interesting.
> 
> I need more time to digest this. It feels like we can merge together the parallel (new) and serial (old) heap iteration
> code for better maintainability. I could try to do so later.

Thanks @shipilev， This is shenandoah support based on parallel heap inspection enabling in serviceability (tracked with
https://bugs.openjdk.java.net/browse/JDK-8215624). hope it is helpful for your review.

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