RFR: 8256265: G1: Improve parallelism in regions that failed evacuation [v7]

[Thomas Schatzl]

On Wed, 14 Sep 2022 12:11:14 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Hi all,
>> 
>>   can I have reviews on this change that makes the evacuation failure remove forwards phase split the work across threads within regions?
>> 
>> This work is a continuation of PR#7047 from @Hamlin-Li and latest improvements from @albertnetymk in that thread. This is reflected in the first commit, I added a fair amount of changes to fix bugs and streamline the code.  
>> 
>> Testing: tier1-8 with G1EvacuationFailureALot enabled, tier1-5 as is
>
> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
> 
>   ayang review 5

Thanks for your reviews. Did a few tier1-4 runs that showed no issue.

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PR: https://git.openjdk.org/jdk/pull/9980