RFR: 8368781: PerfMemory - make issues more transparent [v2]

[David Holmes]

On Wed, 8 Oct 2025 07:27:50 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:
> 
>   Make EnhanceErrorWarningLogging DIAGNOSTIC

PerfMemory should be converted to Unified Logging (UL). We don't want any new flags for ad-hoc logging.

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PR Comment: https://git.openjdk.org/jdk/pull/27602#issuecomment-3395624819