RFR: 8318570: GenShen: Only start old cycles if a young cycle is ready to run

[Kelvin Nilsen]

On Thu, 19 Oct 2023 21:56:21 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Each old cycle in the generational mode is preceded by a "bootstrap" young cycle. When old cycles are triggered independently of young cycles, the bootstrap cycle may be unproductive (especially if it follows a recent young cycle). With this change, the bootstrap cycle effectively replaces the ordinary young cycle.

Thanks.

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Marked as reviewed by kdnilsen (Committer).

PR Review: https://git.openjdk.org/shenandoah/pull/344#pullrequestreview-1688760559