RFR: 8276129: PretouchTask should page-align the chunk size [v2]

[Stefan Karlsson]

On Fri, 5 Nov 2021 00:53:33 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Please review this change to PretouchTask to page-align the chunk size.
>> Aligning down is used because it's easy; aligning up would require dealing
>> with possible overflow or verifying that overflow isn't possible.
>> 
>> Testing:
>> mach5 tier1
>> 
>> Locally (linux-x64) java -version with pretouch task logging and various
>> chunk sizes, manually verifying the number of workers was as expected.
>
> Kim Barrett has updated the pull request incrementally with one additional commit since the last revision:
> 
>   use align_down_bounded

Marked as reviewed by stefank (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/6204