RFR: 8313574: GenShen: Completing a global mark should also complete an old mark [v2]

[Y. Srinivas Ramakrishna]

On Tue, 15 Aug 2023 16:10:42 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> src/hotspot/share/gc/shenandoah/shenandoahOldGeneration.cpp line 417:
>> 
>>> 415: //           |   |        |     +-----------------+
>>> 416: //           |   |        |     |    WAITING FOR  |
>>> 417: //           |   +--------|---> |    EVACUATIONS  |
>> 
>> This transition has arrows at both ends (IDLE and WAITING FOR EVACUATIONS).
>
> That is intentional, I shall also add an arrow at both ends for IDLE and WAITING FOR FILL. Global cycles do not progress the old generation through marking/bootstrapping so they are allowed to move the old generation from IDLE to one of these states at the end of global mark.

I see, so a bidirectional arrow?

It would of course be ideal (in the fullness of time) if there were events labeling the transitions, even if this required a table for the event alphabet.

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PR Review Comment: https://git.openjdk.org/shenandoah/pull/304#discussion_r1294853115