RFR: 8292591: Experimentally add back barrier-less Java thread transitions [v4]

[Robbin Ehn]

On Fri, 9 Sep 2022 09:55:46 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> Thanks for the update! LGTM. I hope that no other platform with older linux kernel is still needed.

Yes, thanks!

> src/hotspot/os/linux/systemMemoryBarrier_linux.cpp line 83:
> 
>> 81: 
>> 82: void LinuxSystemMemoryBarrier::emit() {
>> 83:   int s =  membarrier(MEMBARRIER_CMD_PRIVATE_EXPEDITED, 0, 0);
> 
> Extra whitespace. Feel free to remove it.

Fixed thanks!

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