RFR: 8294775: Shenandoah: reduce contention on _threads_in_evac [v2]

[Nick Gasson]

On Tue, 11 Oct 2022 11:57:55 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> Nick Gasson has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Refactor
>
> src/hotspot/share/gc/shenandoah/shenandoahEvacOOMHandler.hpp line 92:
> 
>> 90:   shenandoah_padding(0);
>> 91:   struct {
>> 92:     volatile jint bits;
> 
> The bits field needs a comment saying that it combines a counter with an OOM bit. In-fact, it would probably benefit from a little bit of refactoring, make it a class, and move accessors and relevant methods into it, and avoid public access to the field?

I'm not sure if it's exactly what you intended, but I had a go at refactoring it in the last commit.

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PR: https://git.openjdk.org/jdk/pull/10573