8330846: Add stacks of mounted virtual threads to the HotSpot thread dump

[jia-wei-tang]

I have two reasons to backport 8330846.

1. When run the jtreg test test/jdk/jdk/jfr/event/runtime/TestThreadDumpEvent.java with the option -testThreadFactory:Virtual, it will fail because of the loss of TestThreadDumpEvent.main in the result.
2. It helps developers to have a better view of their programs.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8330846 needs maintainer approval

Issue

• JDK-8330846: Add stacks of mounted virtual threads to the HotSpot thread dump (Enhancement - P3)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/1129/head:pull/1129
$ git checkout pull/1129

Update a local copy of the PR:
$ git checkout pull/1129
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/1129/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 1129

View PR using the GUI difftool:
$ git pr show -t 1129

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/1129.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back jwtang! 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.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

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

[openjdk]

⚠️ @jia-wei-tang 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 (1954f0a7)

[jia-wei-tang]

/approval request backport 8330846 to jdk21-dev because of two reasons.

1. When run the jtreg test test/jdk/jdk/jfr/event/runtime/TestThreadDumpEvent.java with the option -testThreadFactory:Virtual, it will fail because of the loss of TestThreadDumpEvent.main in the result.
2. It helps developers to have a better view of their programs.

[openjdk]

@jia-wei-tang
8330846: The approval request has been created successfully.

[GoeLin]

Hi @jia-wei-tang,
what about follow-up JDK-8334215, is this needed also?
Removing the label in the meantime.

[jia-wei-tang]

Hi @jia-wei-tang, what about follow-up JDK-8334215, is this needed also? Removing the label in the meantime.

Yes, It is needed. Should I backport JDK-8334215 in the same pr or create a new one?