jmx-dev RFR: 8304074: [JMX] Add an approximation of total bytes allocated on the Java heap by the JVM [v12]

[David Holmes]

On Tue, 9 May 2023 01:23:23 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()

src/hotspot/share/services/threadService.cpp line 224:

> 222: 
> 223:   decrement_thread_counts(jt, daemon);
> 224:   ThreadService::incr_exited_allocated_bytes(jt->cooked_allocated_bytes());

Again this is too soon. This should be deferred until after the thread has removed itself from the threads-list.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13814#discussion_r1188026675