RFR: Differentiate young generation marking. [v2]

[Bernd Mathiske]

On Tue, 8 Dec 2020 19:02:58 GMT, Charlie Gracie <cgracie at openjdk.org> wrote:

>> Bernd Mathiske has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains one commit:
>> 
>>   Differentiate young generation marking.
>
> src/hotspot/share/gc/shenandoah/shenandoahFreeSet.cpp line 149:
> 
>> 147:   }
>> 148: 
>> 149:   try_recycle_trashed(r);
> 
> I am curious why this code moved up? I do not believe there is anything wrong just curious

This is a bug fix. We must clear the trash state and we should attempt to make this region free BEFORE asking to assign it to a generation for allocation.

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PR: https://git.openjdk.java.net/shenandoah/pull/8