RFR: 8298173: GarbageCollectionNotificationContentTest test failed: no decrease in Eden usage

[Daniel D. Daugherty]

On Wed, 7 Dec 2022 21:50:11 GMT, Kevin Walls <kevinw at openjdk.org> wrote:

> Test should not check that Eden has decreased in used size if the GCCause is "No GC".
> 
> These happen with the message "end of concurrent GC pause" which is logged by the GCMemoryManager _conc_gc_memory_manager (in G1MonitoringSupport).  This GCMemoryManager only interacts with the old gen memory pool, so it is expected that eden usage does not change.
> 
> Updated a few variable names to make it more obvious what count and number are recording, and some formatting.  The key  part of the change is at line 137 onwards.

This bug appears to be a regression caused by the fix for:

[JDK-8297247](https://bugs.openjdk.org/browse/JDK-8297247) Add GarbageCollectorMXBean for Remark and Cleanup pause time in G1

so I've bumped the priority from P4 -> P2 since it appears to be a regression. I've
also retargeted the bug from '21' -> '20'.

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PR: https://git.openjdk.org/jdk/pull/11572