[jdk16] RFR: 8259765: ZGC: Handle incorrect processor id reported by the operating system [v2]

[Per Liden]

On Sat, 16 Jan 2021 13:00:04 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Per Liden has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Review
>
> So we have to penalize all correctly functioning users because of one broken environment? Can we not detect this broken environment at startup and inject a workaround then?
> 
> Why is this an environment that is important enough that OpenJDK has to make changes to deal with a broken environment?
> 
> Cheers,
> David

@dholmes-ora Do you still have questions or concerns here, or can I go ahead and integrate this?

I've gone through all uses of sysconf(_SC_NPROCESSORS_*) and sched_getaffinity() we have, and they look fine. I've also looked at how the OSContainer stuff behaves in this environment, and it also looks fine. In summary, the only problem I can spot is related to sched_getcpu().

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PR: https://git.openjdk.java.net/jdk16/pull/124