8370492: [Linux] Update cpu shares to cpu.weight mapping function

[sendaoYan]

Hi all,

This pull request contains a backport of commit 5d65c23c from the openjdk/jdk repository.

The commit being backported was authored by Severin Gehwolf on 14 Nov 2025 and was reviewed by Casper Norrbin, Albert Mingkun Yang and SendaoYan.

Thanks!

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8370492 needs maintainer approval

Issue

• JDK-8370492: [Linux] Update cpu shares to cpu.weight mapping function (Enhancement - P4 - Approved)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/2512/head:pull/2512
$ git checkout pull/2512

Update a local copy of the PR:
$ git checkout pull/2512
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/2512/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2512

View PR using the GUI difftool:
$ git pr show -t 2512

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/2512.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back syan! 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]

@sendaoYan 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:

8370492: [Linux] Update cpu shares to cpu.weight mapping function

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 61 new commits pushed to the master branch:

• 6658759: Merge
• 02b29b0: 8314555: Build with mawk fails on Windows
• 3931807: 8378802: [21u] backport changes to TKit.java by JDK-8352419
• ... and 58 more: https://git.openjdk.org/jdk21u-dev/compare/1cda280a5ea6eff4186dac5745ca202392a57369...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]

⚠️ @sendaoYan 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

• 03: Full - Incremental (2b2343cf)
• 02: Full - Incremental (cff68e34)
• 01: Full - Incremental (3d3cb870)
• 00: Full (3dd5a539)

[sendaoYan]

Verify commnd

j -jdk:build/linux-x86_64-server-release/images/jdk/ -Djdk.test.docker.image.name=jdk-build -Djdk.test.docker.image.version=11 test/jdk/jdk/internal/platform/docker/TestDockerCpuMetrics.java test/hotspot/jtreg/containers/docker/TestMisc.java test/jdk/jdk/internal/platform/docker/MetricsCpuTester.java

[sendaoYan]

Blocked by https://bugs.openjdk.org/browse/JDK-8370966

[sendaoYan]

Blocked by 8346048

[bridgekeeper]

@sendaoYan This pull request has been inactive for more than 4 weeks and will be automatically closed if another 4 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!

[bridgekeeper]

@sendaoYan This pull request has been inactive for more than 4 weeks and will be automatically closed if another 4 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!

[sendaoYan]

All the tests in test/jdk/jdk/internal/platform/docker and test/hotspot/jtreg/containers/docker/ run passed after this PR, except containers/docker/TestJcmdWithSideCar.java fails

[sendaoYan]

/approval request Clean backport update the Linux container detection code to adapt the cg v2 to most recent runtimes' implementation. Before this backport PR, test/jdk/jdk/internal/platform/docker/TestDockerCpuMetrics.java failed, after this backport PR, test/jdk/jdk/internal/platform/docker/TestDockerCpuMetrics.java passed. All the tests in test/jdk/jdk/internal/platform/docker and test/hotspot/jtreg/containers/docker/ run passed after this PR, except containers/docker/TestJcmdWithSideCar.java fails and has been addressed by JDK-8341518

[openjdk]

@sendaoYan
8370492: The approval request has been created successfully.

[bridgekeeper]

@sendaoYan This pull request has been inactive for more than 4 weeks and will be automatically closed if another 4 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!

[sendaoYan]

Thanks for the approved.

/integrate

[openjdk]

Going to push as commit 7206cc3.
Since your change was applied there have been 80 commits pushed to the master branch:

• 1ea1fe9: 8368181: ProblemList java/awt/Dialog/ModalExcludedTest/ModalExcludedTest.java
• de7d89d: 8368670: Deadlock in JFR on event register + class load
• 3a55353: 8357086: os::xxx functions returning memory size should return size_t
• ... and 77 more: https://git.openjdk.org/jdk21u-dev/compare/1cda280a5ea6eff4186dac5745ca202392a57369...master

Your commit was automatically rebased without conflicts.

[openjdk]

@sendaoYan Pushed as commit 7206cc3.

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