RFR: 8343205: CompileBroker::possibly_add_compiler_threads excessively polls available memory [v2]

[Martin Doerr]

On Fri, 1 Nov 2024 00:22:42 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> This PR adds a quick check + bail out in order to avoid excessive usage of slow checks. Especially, it avoids querying the available memory so often.
>
> Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Minor improvements (review feedback).

Thanks for the reviews!

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PR Comment: https://git.openjdk.org/jdk/pull/21812#issuecomment-2454262340