8347129: cpuset cgroups controller is required for no good reason

[jerboaa]

Clean backport from JDK 21u. Should be low risk. Affects newer development systems on Linux, like F41+, where memory limits aren't properly detected.

Container tests fail on affected systems (before the patch):

Passed: containers/cgroup/CgroupSubsystemFactory.java
Passed: containers/cgroup/PlainRead.java
Passed: containers/docker/DockerBasicTest.java
Passed: containers/docker/ShareTmpDir.java
Passed: containers/docker/TestContainerInfo.java
FAILED: containers/docker/TestCPUAwareness.java
FAILED: containers/docker/TestCPUSets.java
Passed: containers/docker/TestJcmd.java
Passed: containers/docker/TestJcmdWithSideCar.java
FAILED: containers/docker/TestJFREvents.java
Passed: containers/docker/TestJFRNetworkEvents.java
Passed: containers/docker/TestJFRWithJMX.java
FAILED: containers/docker/TestLimitsUpdating.java
FAILED: containers/docker/TestMemoryAwareness.java
Passed: containers/docker/TestMemoryWithCgroupV1.java
FAILED: containers/docker/TestMisc.java
FAILED: containers/docker/TestPids.java
Test results: passed: 10; failed: 7; skipped: 1

Caused by:

 stdout: [[0.000s][trace][os,container] OSContainer::init: Initializing Container Support
[0.000s][debug][os,container] Detected optional pids controller entry in /proc/cgroups
[0.000s][debug][os,container] controller cpu is not enabled

[0.000s][debug][os,container] One or more required controllers disabled at kernel level.
openjdk version "17.0.18-internal" 2026-01-20
OpenJDK Runtime Environment (fastdebug build 17.0.18-internal+0-adhoc.sgehwolf.jdk17u-dev)
OpenJDK 64-Bit Server VM (fastdebug build 17.0.18-internal+0-adhoc.sgehwolf.jdk17u-dev, mixed mode, sharing)
];
 stderr: []
 exitValue = 0

java.lang.RuntimeException: 'active_processor_count.*1' missing from stdout/stderr

Testing after the patch (on an affected system):

Passed: containers/cgroup/CgroupSubsystemFactory.java
Passed: containers/cgroup/PlainRead.java
Passed: containers/docker/DockerBasicTest.java
Passed: containers/docker/ShareTmpDir.java
Passed: containers/docker/TestContainerInfo.java
Passed: containers/docker/TestCPUAwareness.java
Passed: containers/docker/TestCPUSets.java
Passed: containers/docker/TestJcmd.java
Passed: containers/docker/TestJcmdWithSideCar.java
Passed: containers/docker/TestJFREvents.java
Passed: containers/docker/TestJFRNetworkEvents.java
Passed: containers/docker/TestJFRWithJMX.java
Passed: containers/docker/TestLimitsUpdating.java
Passed: containers/docker/TestMemoryAwareness.java
Passed: containers/docker/TestMemoryWithCgroupV1.java
Passed: containers/docker/TestMisc.java
Passed: containers/docker/TestPids.java
Test results: passed: 17

After patch on cgroup v1 (no-op there):

Passed: containers/cgroup/CgroupSubsystemFactory.java
Passed: containers/cgroup/PlainRead.java
Passed: containers/docker/DockerBasicTest.java
Passed: containers/docker/ShareTmpDir.java
Passed: containers/docker/TestContainerInfo.java
Passed: containers/docker/TestCPUAwareness.java
Passed: containers/docker/TestCPUSets.java
Passed: containers/docker/TestJcmd.java
Passed: containers/docker/TestJcmdWithSideCar.java
Passed: containers/docker/TestJFREvents.java
Passed: containers/docker/TestJFRNetworkEvents.java
Passed: containers/docker/TestJFRWithJMX.java
Passed: containers/docker/TestLimitsUpdating.java
Passed: containers/docker/TestMemoryAwareness.java
Passed: containers/docker/TestMemoryWithCgroupV1.java
Passed: containers/docker/TestMisc.java
Passed: containers/docker/TestPids.java
Test results: passed: 17; skipped: 1

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8347129 needs maintainer approval

Warning

 ⚠️ Found leading lowercase letter in issue title for 8347129: cpuset cgroups controller is required for no good reason

Issue

• JDK-8347129: cpuset cgroups controller is required for no good reason (Bug - P3 - Approved)

Reviewing

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[bridgekeeper]

👋 Welcome back sgehwolf! 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]

@jerboaa 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:

8347129: cpuset cgroups controller is required for no good reason

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 13 new commits pushed to the master branch:

• 138c1f5: 8355333: Some Problem list entries point to non-existent / wrong files
• 200552e: 8353586: Open source several toolkit tests
• 838f69c: 8252329: runtime/LoadClass/TestResize.java timed out
• ... and 10 more: https://git.openjdk.org/jdk17u-dev/compare/5c4b47c0d25f04c2b0314eb746765793b638395c...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this 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]

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

[openjdk]

⚠️ @jerboaa 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 (62820b56)

[jerboaa]

/integrate

[openjdk]

Going to push as commit 7828779.
Since your change was applied there have been 13 commits pushed to the master branch:

• 138c1f5: 8355333: Some Problem list entries point to non-existent / wrong files
• 200552e: 8353586: Open source several toolkit tests
• 838f69c: 8252329: runtime/LoadClass/TestResize.java timed out
• ... and 10 more: https://git.openjdk.org/jdk17u-dev/compare/5c4b47c0d25f04c2b0314eb746765793b638395c...master

Your commit was automatically rebased without conflicts.

[openjdk]

@jerboaa Pushed as commit 7828779.

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