8325613: CTW: Stale method cleanup requires GC after Sweeper removal

[shipilev]

Clean backport to improve CTW testing times.

Additional testing:

• Ad-hoc CTW time measurements for java.base demonstrate the same improvements as in mainline
• Linux x86_64 server fastdebug, large CTW runs pass with this patch applied
• MacOS AArch64 server fastdebug, applications/ctw/modules passes

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8325613 needs maintainer approval

Issue

• JDK-8325613: CTW: Stale method cleanup requires GC after Sweeper removal (Bug - P4 - Approved)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/370/head:pull/370
$ git checkout pull/370

Update a local copy of the PR:
$ git checkout pull/370
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/370/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 370

View PR using the GUI difftool:
$ git pr show -t 370

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/370.diff

Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back shade! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[shipilev]

/approval request Clean backport to improve CTW testing times. CTW tests pass, and much faster with the patch applied. Have been running in my CI for several days without problems. The benefit for testing time is so large I would like to have it in our dev repositories sooner. Risk is low, test only fix.

[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:

8325613: CTW: Stale method cleanup requires GC after Sweeper removal

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

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

[openjdk]

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

[openjdk]

⚠️ @shipilev 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.

[openjdk]

@shipilev
8325613: The approval request has been created successfully.

[mlbridge]

Webrevs

• 00: Full (e5a295d8)

[shipilev]

GHA test failures are environmental.

[shipilev]

/integrate

[openjdk]

Going to push as commit 9e1840f.
Since your change was applied there has been 1 commit pushed to the master branch:

• 2de8cfa: 8327799: JFR view: the "Park Until" field of jdk.ThreadPark is invalid if the parking method is not absolute

Your commit was automatically rebased without conflicts.

[openjdk]

@shipilev Pushed as commit 9e1840f.

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