RFR: 8346737: GenShen: Generational memory pools should not report zero for maximum capacity

[Kelvin Nilsen]

On Fri, 20 Dec 2024 18:09:49 GMT, William Kemper <wkemper at openjdk.org> wrote:

> The following tests fail in generational mode because the old generation reports a _maximum_ capacity of zero when it is empty. It makes sense to treat maximum capacity as a _theoretical_ maximum and let it equal the total size of the heap.
> 
> - vmTestbase/nsk/monitoring/MemoryPoolMBean/isCollectionUsageThresholdExceeded/isexceeded001/TestDescription.java 
> - vmTestbase/nsk/monitoring/MemoryPoolMBean/isCollectionUsageThresholdExceeded/isexceeded002/TestDescription.java 
> - vmTestbase/nsk/monitoring/MemoryPoolMBean/isCollectionUsageThresholdExceeded/isexceeded003/TestDescription.java 
> - vmTestbase/nsk/monitoring/MemoryPoolMBean/isCollectionUsageThresholdExceeded/isexceeded004/TestDescription.java 
> - vmTestbase/nsk/monitoring/MemoryPoolMBean/isCollectionUsageThresholdExceeded/isexceeded005/TestDescription.java 
> - vmTestbase/nsk/monitoring/MemoryPoolMBean/setCollectionUsageThreshold/setthreshold001/TestDescription.java 
> - vmTestbase/nsk/monitoring/MemoryPoolMBean/setCollectionUsageThreshold/setthreshold002/TestDescription.java 
> - vmTestbase/nsk/monitoring/MemoryPoolMBean/setCollectionUsageThreshold/setthreshold003/TestDescription.java 
> - vmTestbase/nsk/monitoring/MemoryPoolMBean/setCollectionUsageThreshold/setthreshold004/TestDescription.java 
> - vmTestbase/nsk/monitoring/MemoryPoolMBean/setCollectionUsageThreshold/setthreshold005/TestDescription.java

Marked as reviewed by kdnilsen (Author).

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PR Review: https://git.openjdk.org/jdk/pull/22851#pullrequestreview-2518250428