RFR: 8327000: GenShen: Integrate updated Shenandoah implementation of FreeSet into GenShen [v14]

[Y. Srinivas Ramakrishna]

On Tue, 18 Jun 2024 20:41:48 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

>> The mainline implementation of ShenandoahFreeSet was recently updated.  This PR integrates the upstream changes
>> into Generational Shenandoah.
>
> Kelvin Nilsen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Resolve delta from openjdk/jdk in external_fragmentation() function

Here's an initial tranche of comments. More as I complete the two remaining files or so. Apologies for the delay.

test/hotspot/jtreg/ProblemList.txt line 104:

> 102: gc/shenandoah/TestHumongousThreshold.java#16b 8327000 generic-all
> 103: gc/shenandoah/TestHumongousThreshold.java#generational 8327000 generic-all
> 104: gc/shenandoah/TestHumongousThreshold.java#generational-16b 8327000 generic-all

Very nice to see the problem list shrink!

-------------

PR Review: https://git.openjdk.org/shenandoah/pull/440#pullrequestreview-2124124227
PR Review Comment: https://git.openjdk.org/shenandoah/pull/440#discussion_r1643582516