RFR: 8343704: Bad GC parallelism with processing Cleaner queues [v2]

[Aleksey Shipilev]

On Wed, 13 Nov 2024 00:30:37 GMT, Brent Christian <bchristi at openjdk.org> wrote:

>> Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Touchups: assert index, polish commits
>
> src/java.base/share/classes/jdk/internal/ref/CleanerImpl.java line 300:
> 
>> 298:                 return true;
>> 299:             }
>> 300:         }
> 
> It looks like the new `PhantomCleanableList.remove()` puts 100% trust in the correctness of the PhantomCleanable's `index`.
> 
> What would you think of adding some sort of check/assert that `list.get(phc.index) == phc` ?

Right, tracking indexes is the part of the algo. I added asserts in most important sites, `java/lang` still passes with `-esa`. Please take a look again.

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PR Review Comment: https://git.openjdk.org/jdk/pull/22043#discussion_r1839714073