RFR: 8353115: GenShen: mixed evacuation candidate regions need accurate live_data [v9]

[Kelvin Nilsen]

On Tue, 16 Sep 2025 23:15:11 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> Kelvin Nilsen has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix compilation errors after merge
>
> src/hotspot/share/gc/shenandoah/heuristics/shenandoahOldHeuristics.cpp line 91:
> 
>> 89:   }
>> 90: 
>> 91:   // Between consecutive mixed-evacuation cycles, the live data within each candidate region may change due to
> 
> I think we could reduce some duplication and call `recalibrate_old_collection_candidates_live_memory` here if the function didn't have the side effect of updating `_live_bytes_in_unprocessed_candidates`. Perhaps the function could return `total_live_data` and be `const`?

Good suggestion.  I've refactored a little.  I think it can't be const because we sort the _region_data.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24319#discussion_r2400354971