RFR: 8242459: ForceNUMA and only one available NUMA node hits a guarantee

[stefan.johansson at oracle.com]

Hi Kim,

On 2020-04-27 05:21, Kim Barrett wrote:
> Please review this small change to avoid failing assertions when
> -XX:+ForceNUMA is used to override the decision to disable UseNUMA
> when there is only one NUMA node being used.  There were a couple of
> places that assumed that if UseNUMA is true then there must be more
> than one NUMA node, but that isn't so.
> 
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8242459
> 
> Webrev:
> https://cr.openjdk.java.net/~kbarrett/8242459/open.00/
Looks good, might be interesting to run a few tier with +ForceNUMA, to 
make sure we don't hit anything else.

Thanks for fixing,
Stefan

> 
> Testing:
> mach5 tier1
> 
> Locally (linux-x64) manually ran the provided test case, verifying
> failure before changes and working after.
>