RFR: 8368781: PerfMemory - make issues more transparent [v8]

[Goetz Lindenmaier]

On Wed, 22 Oct 2025 08:27:39 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

>> Currently issues with perfMemory like problems with the secure tmp subdirectory creation are not very transparent in release JVMs.
>> 
>> There exists some warnings traces but they are behind develop flags like Verbose so only available in debug JVMs.
>> We could (in case of issues) store some information and write it later into hsinfo/hserr files ; or make the existing warnings available too in release JVMs.
>
> Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Adjust following suggestions by Goetz

Thanks for the improvements!

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Marked as reviewed by goetz (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/27602#pullrequestreview-3364695319