RFR: 8322278: Generational ZGC: Adjust ZHeuristics::use_per_cpu_shared_small_pages to meet its comment

[Erik Österlund]

On Thu, 28 Dec 2023 22:10:57 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Hi all,
>> 
>> This trivial patch fixes the method `ZHeuristics::use_per_cpu_shared_small_pages` to meet its comment.
>> 
>> Thanks for the review.
>> 
>> Best Regards,
>> -- Guoxiong
>
> src/hotspot/share/gc/z/zHeuristics.cpp line 66:
> 
>> 64:   // of the max heap size. Otherwise fall back to using a single shared small
>> 65:   // page. This is useful when using small heaps on large machines.
>> 66:   const size_t per_cpu_share = (MaxHeapSize * 0.03125) / ZCPU::count();
> 
> The proposed change just reverts what appears to have been an intentional code
> change in JDK-8307058. That change should have updated the comment.  So I
> don't think this change should be made.  The comment should be fixed instead.

Agreed.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17138#discussion_r1437910871