8367473: Shenandoah: Make the detailed evacuation metrics a runtime diagnostic option

[earthling-amzn]

Conflict on pacer, not hard to resolve

---

Progress

• JDK-8367473 needs maintainer approval
• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8367722 needs maintainer approval

Issues

• JDK-8367473: Shenandoah: Make the detailed evacuation metrics a runtime diagnostic option (Enhancement - P4 - Approved)
• JDK-8367722: [GenShen] ShenandoahEvacuationStats is always empty (Bug - P4 - Approved)

Reviewing

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$ git pull https://git.openjdk.org/jdk25u-dev.git pull/449/head

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[bridgekeeper]

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[openjdk]

@earthling-amzn This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8367473: Shenandoah: Make the detailed evacuation metrics a runtime diagnostic option
8367722: [GenShen] ShenandoahEvacuationStats is always empty

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[openjdk]

This backport pull request has now been updated with issues from the original commit.

[openjdk]

⚠️ @earthling-amzn This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[mlbridge]

Webrevs

• 00: Full (340ac341)

[earthling-amzn]

/approval request This change converts a non-product only build time option into a runtime option. This option has provided very valuable performance debugging data from release builds. This change only affects Shenandoah code. We (Amazon) have enabled this option in production-like environments and we see no significant performance impact when the option is disabled.

[openjdk]

@earthling-amzn
8367473: The approval request has been created successfully.
8367722: The approval request has been created successfully.