Integrated: Use state from collection set to know if mixed collection is in progress

[William Kemper]

On Wed, 20 Apr 2022 16:10:49 GMT, William Kemper <wkemper at openjdk.org> wrote:

> The state that indicated when a mixed collection was in progress was represented in two places: a property of the collection set and a member variable on the heap set after the collection set was chosen. In some cases, a degenerated cycle could cause the heap's member variable to become stale (indicating a mixed evac was in progress when it was not). In this case, update references could fail to update references in old regions with an incomplete mark bitmap. With this change, update references uses the property of the collection set to know if a mixed evacuation is in progress.

This pull request has now been integrated.

Changeset: 5ec87a5d
Author:    William Kemper <wkemper at openjdk.org>
URL:       https://git.openjdk.java.net/shenandoah/commit/5ec87a5da0a95135039ab2ec13659ffee3e8e551
Stats:     42 lines in 11 files changed: 0 ins; 23 del; 19 mod

Use state from collection set to know if mixed collection is in progress

Reviewed-by: kdnilsen

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PR: https://git.openjdk.java.net/shenandoah/pull/134