RFR: 8327000: GenShen: Integrate updated Shenandoah implementation of FreeSet into GenShen [v8]

[Y. Srinivas Ramakrishna]

On Thu, 13 Jun 2024 22:22:01 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:
> 
>   Minor refinements to test programs
>   
>   TestAllocIntArrays: comments to explain behavior.
>   TestOldGrowthTriggers: reduce the number of loop iterations so this test
>   will not time out on less powerful test platforms.

src/hotspot/share/gc/shenandoah/shenandoahFreeSet.hpp line 382:

> 380:   // of the regions recycled from the collection set will be available.  In the very unlikely event that there
> 381:   // are fewer regions in the collection set than remain in the collector's free set, we limit the transfer in order
> 382:   // to assure that the replenished Collector reserves can be sufficiently large.

Apropos my previous comment, this part would seem to belong in the caller(s?) of the method.

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PR Review Comment: https://git.openjdk.org/shenandoah/pull/440#discussion_r1645269790