RFR: 8277137: Set OnSpinWaitInst/OnSpinWaitInstCount defaults to "isb"/1 for Arm Neoverse N1 [v2]

[Evgeny Astigeevich]

On Wed, 17 Nov 2021 12:01:12 GMT, Evgeny Astigeevich <duke at openjdk.java.net> wrote:

>> src/hotspot/cpu/aarch64/vm_version_aarch64.cpp line 206:
>> 
>>> 204:     }
>>> 205: 
>>> 206:     if (FLAG_IS_DEFAULT(OnSpinWaitInst) && FLAG_IS_DEFAULT(OnSpinWaitInstCount)) {
>> 
>> Should these two be set independently? If I pass `-XX:OnSpinWaitInstCount=2` then `OnSpinWaitInst` will default to "none".
>
> Hi Nick,
> Thank you for reviewing the PR.
> 
>> Should these two be set independently?
> 
> I don't mind.

Done.

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PR: https://git.openjdk.java.net/jdk/pull/6415