[jdk18u] RFR: 8281181: Do not use CPU Shares to compute active processor count

[David Holmes]

On Tue, 29 Mar 2022 22:42:45 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> Please review this backport of [JDK-8281181](https://bugs.openjdk.java.net/browse/JDK-8281181) to jdk18u. Most changes were cleanly applied, except:
> 
> - The changes in related to the deprecation of `UseContainerCpuShares` and `PreferContainerQuotaForCPUCount`) have been dropped. That's because the deprecation happens in the JDK 19 release cycle, not in 18u.
> 
> You can compare with the JDK 19 version of the changes [here](https://github.com/openjdk/jdk/pull/7666/files). 
> 
> Tested with tiers 1-5, including all container test tasks.

Looks good!

Thanks,
David

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Marked as reviewed by dholmes (Reviewer).

PR: https://git.openjdk.java.net/jdk18u/pull/78