Integrated: 8360776: Disable Intel APX by default and enable it with -XX:+UnlockExperimentalVMOptions -XX:+UseAPX in all builds

[Srinivas Vamsi Parasa]

On Fri, 27 Jun 2025 22:13:47 GMT, Srinivas Vamsi Parasa <sparasa at openjdk.org> wrote:

> Currently, APX is not enabled consistently between product and debug builds.
> 
> If the hardware supports Intel APX:
> 
> 1) In product builds, APX is disabled by default, even if the user explicitly enables it using `-XX:+UnlockExperimentalVMOptions -XX:+UseAPX`.
> 
> 2) In debug builds, APX is enabled by default regardless of whether the user explicitly enables it or not.
> 
> **The goal of this PR is to enable APX for both product and debug builds if and only if the user explicitly enables it using `-XX:+UnlockExperimentalVMOptions -XX:+UseAPX`.**

This pull request has now been integrated.

Changeset: 26b00280
Author:    Srinivas Vamsi Parasa <sparasa at openjdk.org>
Committer: Vladimir Kozlov <kvn at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/26b002805ab235d07998eddd486fe66a69f60671
Stats:     16 lines in 4 files changed: 0 ins; 16 del; 0 mod

8360776: Disable Intel APX by default and enable it with -XX:+UnlockExperimentalVMOptions -XX:+UseAPX in all builds

Reviewed-by: sviswanathan, dholmes, jbhateja

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PR: https://git.openjdk.org/jdk/pull/26029