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

[Guoxiong Li]

On Thu, 28 Dec 2023 22:48:06 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

>> 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.

Should I change the title of this issue and fix the comment in this patch? Or open another issue and PR to fix it?

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PR Review Comment: https://git.openjdk.org/jdk/pull/17138#discussion_r1437968799