RFR: 8324649: Shenandoah: refactor implementation of free set [v6]

[Kelvin Nilsen]

On Thu, 1 Feb 2024 05:22:21 GMT, Y. Srinivas Ramakrishna <ysr at openjdk.org> wrote:

>> Kelvin Nilsen has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Rename and comments for _capacity_of and _used_by
>
> src/hotspot/share/gc/shenandoah/shenandoahFreeSet.hpp line 50:
> 
>> 48:   const size_t _max;            // The maximum number of heap regions
>> 49:   const size_t _region_size_bytes;
>> 50:   const ShenandoahFreeSet* _free_set;
> 
> Interesting: why does the partitioning need a reference to its containing free set?

There are a few places where ShenandoahRegionPartitions invokes services provided by ShenandoahFreeSet, such as calling _free_set->alloc_capacity() when enforcing certain assertions and when adjusting interval boundaries.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17561#discussion_r1481922483