RFR: Generation resizing [v3]

[William Kemper]

On Thu, 8 Dec 2022 07:57:51 GMT, Y. Srinivas Ramakrishna <ysr at openjdk.org> wrote:

>> William Kemper has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove vestigial lock, do not enroll periodic task while holding threads_lock
>
> src/hotspot/share/gc/shenandoah/shenandoahYoungGeneration.cpp line 95:
> 
>> 93: 
>> 94: void ShenandoahYoungGeneration::add_collection_time(double time_seconds) {
>> 95:   if (_old_gen_task_queues != NULL) {
> 
> This seems a bit subtle. Isn't there a better/official status flag to check, or a default second parm to leverage from caller?

I'll turn this into an `is_bootstrapping()` method.

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PR: https://git.openjdk.org/shenandoah/pull/177