RFR (S) 8246100: Shenandoah: walk roots in more efficient order

[Zhengyu Gu]

Wait, should we process CLDG early? CLD likely uneven, e.g. boot class 
loader may take a lot longer than others.

Thanks,

-Zhengyu

On 6/1/20 3:03 PM, Zhengyu Gu wrote:
> Looks good in general. But not sure why call vm/weak/dedup roots limited 
> parallel, I think they are fully parallel.
> 
> -Zhengyu
> 
> On 6/1/20 6:24 AM, Aleksey Shipilev wrote:
>> RFE:
>>    https://bugs.openjdk.java.net/browse/JDK-8246100
>>
>> See the rationale in the RFE.
>>
>> Webrev:
>>    https://cr.openjdk.java.net/~shade/8246100/webrev.02/
>>
>> Testing: hotspot_gc_shenandoah
>>