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)

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]

❗ 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]

⚠️ @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

• 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