RFR: 8292591: Experimentally add back barrier-less Java thread transitions [v2]

[Robbin Ehn]

On Mon, 5 Sep 2022 13:36:31 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Change header and constants handling
>
> src/hotspot/os/linux/systemMemoryBarrier_linux.cpp line 36:
> 
>> 34: // Syscall defined in kernel 4.3
>> 35: #if !defined(SYS_membarrier)
>> 36: #define SYS_membarrier 324
> 
> I'd like to get rid of the platform checks in this generic linux file.
> This number seems to be the only platform specific part:

@TheRealMDoerr please have another look :)

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