RFR: 8351851: Update PmemTest to run on AMD64

[Mark Sheppard]

On Wed, 16 Apr 2025 10:33:31 GMT, Andrew Dinn <adinn at openjdk.org> wrote:

> > It would be preferable if we retained the current test structure and swap
> > the x86_64 with amd64, as amd64 is the os.arch on which the test will be run
> 
> When I wrote my previous comment I was under the impression that `@requires(os.arch == "x86_64")` selects Intel x86 64-bit only while `@requires(os.arch == "amd64")` selects either Intel x86 64-bit or AMD x86 64-bit. However, having looked through the code in files:
> 
> ```
> test/jdk/jdk/internal/util/ArchTest.java
> src/java.base/share/classes/jdk/internal/util/Architecture.java
> src/java.base/share/classes/jdk/internal/util/PlatformProps.java
> /make/modules/java.base/gensrc/GensrcMisc.gmk
> ```
> 
> it appears to me that these two `@requires` clauses select the same thing i.e. either Intel x86 64-bit or AMD x86 64-bit. In which case the current config should mean that this test will run on AMD CPUs. Is that not the case?

Thanks for the details above. Currently the main linux execution platforms are returning "amd64" for the OS arch,  and that is not picked up by the current   @requires (os.arch == "x86_64")
so this is a pragmatic change to facilitate the manual execution of the most prevalent test environments.

It was observed that there might be a separate issue for jtreg on the @requires and
based on your feedback, and expectations there is a separate jtreg  issue to investigate the consistency of @requires on the os.arch attribute.

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PR Comment: https://git.openjdk.org/jdk/pull/24416#issuecomment-2809243922