[jdk8u-dev] RFR: 8292541: [Metrics] Reported memory limit may exceed physical machine memory

[Jonathan Dowland]

On Fri, 13 Jan 2023 14:48:38 GMT, Jonathan Dowland <jdowland at openjdk.org> wrote:

>> Note that with an instrumented JDK I was able to observe the following (when the test fails):
>> 
>> 
>> systemMemory == -1308622848
>> containerMemory == 104857600
>> Metrics.getMemoryLimit() == -1
>> 
>> 
>> I.e. we were getting a negative host memory value.
>
> Thanks for working on this! I guess without the explicit intermediate variables some kind of integer promotion/demotion is going on and there's an overflow on 32 bit?
> 
> I'll raise the upstream bug, thanks!

I wonder what the behaviour is on ARM32. I don't know whether we are testing that, whether it's explicitly supported for jdk8u or not, or by who. I've been wondering that since the reports of problems with non-static member initialization in another backport.

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PR: https://git.openjdk.org/jdk8u-dev/pull/220