RFR: 8301149: Parallel: Refactor MutableNUMASpace::update_layout

[Igor Veresov]

On Thu, 26 Jan 2023 12:15:56 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Small cleanup to simplify the structure.
> 
> Test: hotspot_gc on boxes with two NUMA nodes.

You shouldn't be destroying the contents of the existing LGRPSpace structures. The intent behind `MutableNUMASpace::update()` is to react to a change in the NUMA layout at runtime (i.e. when the CPUs a hotplugged/unplugged, not sure if that's even possible on Linux, but it was on Solaris). I wonder how you tested this change?

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PR: https://git.openjdk.org/jdk/pull/12216