8261413: Shenandoah: Disable class-unloading in I-U mode

[shipilev]

This workarounds the bug in non-default Shenandoah mode. The risk is low, as it only affects Shenandoah code.

Additional testing:

• hotspot_gc_shenandoah

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed

Issue

• JDK-8261413: Shenandoah: Disable class-unloading in I-U mode

Reviewers

• Zhengyu Gu (@zhengyu123 - Reviewer)

Download

$ git fetch https://git.openjdk.java.net/jdk16u pull/54/head:pull/54
$ git checkout pull/54

[bridgekeeper]

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[openjdk]

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

[shipilev]

/label shenandoah

[openjdk]

@shipilev 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:

8261413: Shenandoah: Disable class-unloading in I-U mode

Reviewed-by: zgu

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been no new commits pushed to the master branch. If another commit should be pushed before you perform the /integrate command, your PR will be automatically rebased. If you prefer to avoid any potential automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[openjdk]

@shipilev The label shenandoah is not a valid label. These labels are valid:

[mlbridge]

Webrevs

• 00: Full (6c7ef9b)

[shipilev]

/integrate

[openjdk]

@shipilev Since your change was applied there have been 5 commits pushed to the master branch:

• b9582bf: 8260048: Shenandoah: ShenandoahMarkingContext asserts are unnecessary
• f081554: 8259580: Shenandoah: uninitialized label in VerifyThreadGCState
• 395ab59: 8258490: Shenandoah: Full GC does not need to remark threads and drain SATB buffers
• cec5816: 8259954: gc/shenandoah/mxbeans tests fail with -Xcomp
• f36b10a: 8261170: Upgrade to freetype 2.10.4

Your commit was automatically rebased without conflicts.

Pushed as commit 39fb8e5.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.