RFR: 8137022: Concurrent refinement thread adjustment and (de-)activation suboptimal [v2]

[Stefan Johansson]

On Thu, 22 Sep 2022 10:28:39 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> `_g1h->young_list_count()` and `young_list_target_length()` can also be
>> changed, protected by `Heap_lock`.
>
> Also, I originally didn't include the used_in_alloc_regions information in the calculation, and the resulting predictions were pretty bad, esp. with larger region sizes.

I see, yeah, I was mostly thinking if there was a way to make it even less likely that we would get no estimate. But if the estimate would be really bad a missing estimate might be better.

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PR: https://git.openjdk.org/jdk/pull/10256