RFR: 8370947: Mitigate Neoverse-N1 erratum 1542419 negative impact on GCs and JIT performance [v25]

[Evgeny Astigeevich]

On Thu, 19 Feb 2026 13:51:04 GMT, Andrew Haley <aph at openjdk.org> wrote:

> > > I don't have unaffected N1 to check. Out of curiosity, does unaffected N1 exist in any cloud?
> > > I think it would not be slower.
> > 
> > 
> > Right, so let's turn this on for all N1. Then we can be sure that it gets tested.
> 
> Did you do that?

It's turned on automatically for all AArch64 having IDC and DIC enabled. Detection of IDC/DIC status is implemented for Linux only at the moment.
Affected N1: DIC is disabled, we detect that this is an affected N1 and turn this on.
Unaffected N1: DIC is enabled, we turn this on.

So it should be turned on for all N1.

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PR Comment: https://git.openjdk.org/jdk/pull/28328#issuecomment-3927534018