RFR: 8315149: Add hsperf counters for CPU time of internal GC threads

[Man Cao]

On Wed, 30 Aug 2023 07:44:07 GMT, David Holmes <dholmes at openjdk.org> wrote:

> This doesn't seem unreasonable, but I do wonder what impact this has on the GC threads to collect this data?

We did some benchmarking when we first implemented these counters in our internal JDK 8. There was no observable performance difference. We could redo the benchmarking in JDK HEAD if people are concerned with accounting overhead.

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PR Comment: https://git.openjdk.org/jdk/pull/15082#issuecomment-1699788606