Initial ajdk commit

[phohensee]

Initial ajdk commit.

To run the tests in test/hotspot/jtreg/tenant, initialize cgroups with

sudo ${JDK21U_HOME}/bin/jgroup -u ${USERNAME} -g ${GROUP}

JDK21U_HOME: Current test JDK.
USERNAME & GROUP: The Linux user and group that running java with tenant enabled.

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Error

 ⚠️ Pull request body is missing required line: - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai).

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/2745/head:pull/2745
$ git checkout pull/2745

Update a local copy of the PR:
$ git checkout pull/2745
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/2745/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2745

View PR using the GUI difftool:
$ git pr show -t 2745

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/2745.diff

[bridgekeeper]

👋 Welcome back phh! 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.

[bridgekeeper]

@phohensee This pull request has been inactive for more than 8 weeks and will be automatically closed if another 8 weeks passes without any activity. To avoid this, simply issue a /touch or /keepalive command to the pull request. Feel free to ask for assistance if you need help with progressing this pull request towards integration!