8302744: Refactor Hotspot container detection code

[jankratochvil]

A patch 1 of 6 for: [21u] Backport intention of 8322420: [Linux] cgroup v2: Limits in parent nested control groups are not detected

The backport is not clean:

• src/hotspot/os/linux/cgroupV1Subsystem_linux.cpp and src/hotspot/os/linux/cgroupV2Subsystem_linux.cpp are missing changed CgroupV1Subsystem::memory_and_swap_usage_in_bytes() as JDK-8325139 has not been backported.

• src/hotspot/os/linux/cgroupV1Subsystem_linux.cpp and src/hotspot/os/linux/cgroupV2Subsystem_linux.cpp are missing changed CgroupV1Subsystem::rss_usage_in_bytes() as JDK-8313083 has not been backported.

• deleted/renamed test/hotspot/gtest/os/linux/test_cgroupSubsystem_linux.cpp has missing static keywords as JDK-8252136 has not been backported.

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• JDK-8302744 needs maintainer approval
• Commit message must refer to an issue

Issue

• JDK-8302744: Refactor Hotspot container detection code (Enhancement - P4)

Reviewers

• Severin Gehwolf (@jerboaa - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/1648/head:pull/1648
$ git checkout pull/1648

Update a local copy of the PR:
$ git checkout pull/1648
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/1648/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 1648

View PR using the GUI difftool:
$ git pr show -t 1648

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/1648.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back jkratochvil! 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.

[mlbridge]

Webrevs

• 00: Full (6ce9ef3f)

[jerboaa]

This looks OK to me.

[openjdk]

⚠️ @jankratochvil 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.

[jerboaa]

Please mention what testing you've done when you apply for approval. Did you run container tests on cg v1 and cg v2? In this case I did, but it would be good to know when looking at such backport requests.