8325807: Shenandoah: Refactor full gc in preparation for generational mode changes

[earthling-amzn]

Changes to prepare for generational mode:

• A phase5_epilogue method is added to run the final steps of the gc
• Prepare for mark operation is run by multiple worker threads
• finish_region method of compacting preparation closure is renamed to finish
• The prepare for compaction loop is extracted to a template method, parameterized on closure type

---

Progress

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Issue

• JDK-8325807: Shenandoah: Refactor full gc in preparation for generational mode changes (Task - P4)

Reviewers

• Aleksey Shipilev (@shipilev - Reviewer)
• Y. Srinivas Ramakrishna (@ysramakrishna - Reviewer)
• Kelvin Nilsen (@kdnilsen - no project role)

Reviewing

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[bridgekeeper]

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[openjdk]

@earthling-amzn The following labels will be automatically applied to this pull request:

• hotspot-gc
• shenandoah

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[mlbridge]

Webrevs

• 01: Full - Incremental (afc10227)
• 00: Full (c631bde4)

[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:

8325807: Shenandoah: Refactor full gc in preparation for generational mode changes

Reviewed-by: shade, ysr, kdnilsen

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[earthling-amzn]

/integrate

[openjdk]

Going to push as commit 33f2382.
Since your change was applied there have been 3 commits pushed to the master branch:

• 419191c: 8325680: Uninitialised memory in deleteGSSCB of GSSLibStub.c:179
• 349df0a: 8326726: Problem list Exhaustiveness.java due to 8326616
• 552411f: 8326824: Test: remove redundant test in compiler/vectorapi/reshape/utils/TestCastMethods.java

Your commit was automatically rebased without conflicts.

[openjdk]

@earthling-amzn Pushed as commit 33f2382.

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