RFR: 8300917: Regression 2x and bimodal startup on Mac aarch64 in b27

[David Holmes]

On Wed, 25 Jan 2023 12:26:26 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR proposed to reduce contention in synchronized methods mainly by doing I/O operations outside synch blocks.

I can't quite see the effect of the change here. You went from a synchronized instance method, to a non-synchronized static method which then immediately synchronizes on the passed in instance. ??

That aside I'm not sure what the synchronization issues are here - isn't setting the native access bit an idempotent operation?

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PR: https://git.openjdk.org/jdk/pull/12193