RFR: 8304074: [JMX] Add an approximation of total bytes allocated on the Java heap by the JVM [v27]

[Paul Hohensee]

On Fri, 26 May 2023 15:37:32 GMT, Paul Hohensee <phh at openjdk.org> wrote:

>> Please review this addition to com.sun.management.ThreadMXBean that returns the total number of bytes allocated on the Java heap since JVM launch by both terminated and live threads.
>> 
>> Because this PR adds a new interface method, I've updated the JMM_VERSION to 4, but would be happy to update it to 3_1 instead.
>
> Paul Hohensee has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8304074: Refactor test exception handling

I added a high water mark to getTotalThreadAllocatedBytes (under a lock, lest we have a monotonicity issue on the high water mark), and updated the tests per Mandy's request.

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PR Comment: https://git.openjdk.org/jdk/pull/13814#issuecomment-1564648234