RFR: 8303210: [linux, Windows] Enable UseSystemMemoryBarrier by default if possible

[Martin Doerr]

On Sat, 25 Feb 2023 09:17:57 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> I'd like to enable UseSystemMemoryBarrier by default on supported Operating Systems in order to improve performance of thread state transitions (I/O, JNI, foreign function calls, JIT compiler threads, etc.). See JBS issue for more details.
> Unfortunately, the feature was not yet implemented on all platforms. I added the code, but need the platform maintainers to check if it can be used reliably (and ideally if the performance improves). It's easy to switch it off again in case of problems.

@bulasevic, @RealFYang, @offamitkumar, @shipilev: Can you please check your platforms and provide feedback?
Maybe the feature can also be implemented for MacOS. I haven't checked.

-------------

PR: https://git.openjdk.org/jdk/pull/12753