RFR: 8304074: [JMX] Add an approximation of total bytes allocated on the Java heap by the JVM [v11]

[David Holmes]

On Mon, 8 May 2023 23:13:05 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:
> 
>   Implement 32-bit linux Atomic::add()

Also note that the current placement of the `incr_exited_allocated_bytes` skips accounting for hidden threads because those ThreadService methods skip hidden threads. You need to do this update as one of the last actions of a terminating/detaching thread.

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PR Comment: https://git.openjdk.org/jdk/pull/13814#issuecomment-1539261740