[jdk17u-dev] RFR: 8324824: AArch64: Detect Ampere-1B core and update default options for Ampere CPUs

[Andrew Dinn]

On Sat, 10 Feb 2024 10:34:54 GMT, Patrick Zhang <qpzhang at openjdk.org> wrote:

> Hi,
> 
> This pull request contains a backport of commit [9936aeea](https://github.com/openjdk/jdk/commit/9936aeea32b71509151099e6d28905e0322b2bc2) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> Not a clean merge to 17u-dev. 
> Manually resolved the merging conflicts due to line differences on `enum Ampere_CPU_Model` and `Feature_Flag`, removed redundant changes in order to limit the update to the code changes only from commit [9936aeea]. This can also lower the risk and limit the functionality impact to to particular Ampere new CPU cores Ampere-1/1A/1B. Same scope as that of the commit [9936aeea].
> 
> Passed pre-submit tests, ran Jtreg `tier1`, `tier2`, and `gtest` tests, no related issue found with the patch, also tested:
> `make run-test TEST="jtreg:hotspot/jtreg/compiler/onSpinWait*" `
> `make run-test TEST="micro:ThreadOnSpinWait*"`
> 
> Thanks for review.

Ok.

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PR Review: https://git.openjdk.org/jdk17u-dev/pull/2202#pullrequestreview-1908530737