8261242: [Linux] OSContainer::is_containerized() returns true when run outside a container

[jankratochvil]

A patch 3 of 6 for: [21u] Backport intention of 8322420: [Linux] cgroup v2: Limits in parent nested control groups are not detected

It has a patch dependency on PR 2 of 6: #1660

This backport is clean. But it contains an additional oneliner (by Yuri Nesterenko):

make/data/hotspot-symbols/symbols-linux:
+JVM_IsContainerized

as otherwise the build would fail with:

src/java.base/linux/native/libjava/CgroupMetrics.c:42:(.text+0x11): undefined reference to `JVM_IsContainerized'

This oneliner was not needed in JDK24 as there is JDK-8017234: Hotspot should stop using mapfiles.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• JDK-8261242 needs maintainer approval
• Commit message must refer to an issue

Integration blocker

 ⚠️ Dependency #1660 must be integrated first

Issue

• JDK-8261242: [Linux] OSContainer::is_containerized() returns true when run outside a container (Enhancement - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/1661/head:pull/1661
$ git checkout pull/1661

Update a local copy of the PR:
$ git checkout pull/1661
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/1661/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 1661

View PR using the GUI difftool:
$ git pr show -t 1661

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/1661.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back jkratochvil! A progress list of the required criteria for merging this PR into pr/1660 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 (0aaf6294)