RFR: 8252104: parallel heap inspection for ShenandoahHeap

[Aleksey Shipilev]

On Tue, 8 Sep 2020 03:15:10 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

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.

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