RFR: 8292591: Experimentally add back barrier-less Java thread transitions

Thu Sep 1 17:52:02 UTC 2022

On Thu, 1 Sep 2022 16:47:58 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

> Please consider, only implemented on x64/aarch64 linux/windows.
> 
> On my box calling clock_gettime via JNI goes from 35ns to 28ns when enabled.
> 
> Passes t1-7 with option forced on, also passes t1-4 as is in this PR.

Build changes look good.

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

Marked as reviewed by erikj (Reviewer).

PR: https://git.openjdk.org/jdk/pull/10123