RFR: 8335480: Only deoptimize threads if needed when closing shared arena [v3]

[Maurizio Cimadamore]

On Mon, 15 Jul 2024 12:10:02 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> I also tried using `MethodHandles::arrayElementGetter` for the access, but the numbers I got were pretty much the same:

This is quite strange, as the code involved should be quite similar to those with memory segments (e.g. you go through a method handle pointing to some helper class). I would have said this would have provided a fairly good comparison.

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PR Comment: https://git.openjdk.org/jdk/pull/20158#issuecomment-2228359381