RFR: Allow young collection to suspend marking in old generation [v14]

[Bernd Mathiske]

On Wed, 3 Mar 2021 12:39:49 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> That is a huge change! Good work!
>> First-pass review follows.
>> 
>> (I need to remember to scan for 'HEY!' in addition to 'TODO' ;-) )
>
> Do you plan to enable reference processing again on old-gen marking? Because I think it's a bad idea to not do it. Ideally, we'd do reference processing on both young-gen and old-gen markings, if that is not possible, then we should at least do it on old-gen markings (I believe other GCs don't do it in young-gen).

Yes, we plan to make reference processing function again and at a minimum this will hold for non-young collections.

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PR: https://git.openjdk.java.net/shenandoah/pull/19