RFR: 8259851: Using boolean type for tasks in SubTasksDone

[Kim Barrett]

On Mon, 18 Jan 2021 20:36:43 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Should this change be made? I understand the intent is to use the
>> semantically intended type, and agree with that intent. But there is a
>> hidden cost; some platforms don't directly support cmpxchg on byte sized
>> values, and use CmpxchgByteUsingInt. Maybe that cost is in the noise, but
>> the question should be considered.  For Zero I don't care.  But there are
>> affected platforms.
>
>> For Zero I don't care. But there are affected platforms.
> 
> I see arm and s390 with grepping `CmpxchgByteUsingInt`; I will test specjbb2015 and dacapo on arm to see if there is any perf diff.

Discussed with @albertnetymk and agreed the impact of this is not going to be measurable, so withdrawing the question.

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PR: https://git.openjdk.java.net/jdk/pull/2131