[jdk11u-dev] RFR: 8239785: Cgroups: Incorrect detection logic on old systems in hotspot

[Severin Gehwolf]

On Fri, 25 Mar 2022 11:05:06 GMT, Jonathan Dowland <jdowland at openjdk.org> wrote:

>> This is a backport of 8239785 for jdk11u. The dependent backports have now all been integrated.
>> 
>> This PR replaces #881 which was stuck with a dependency on a superseded dependent PR.
>> 
>> It's not clean, but the only conflict was the copyright line in the
>> comment header for src/hotspot/share/prims/whitebox.hpp.
>> 
>> I'm checking jtreg tests in test/hotspot/jtreg/containers on a mixture of cgroup v1 and v2 systems now.
>> 
>> ---------
>> ### Progress
>> - [x] Change must not contain extraneous whitespace
>> - [x] Commit message must refer to an issue
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>> 
>> ### Error
>>  ⚠️ The pull request body must not be empty.
>> 
>> 
>> 
>> ### Reviewing
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>> Checkout this PR locally: \
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>> `$ git checkout pull/946`
>> 
>> Update a local copy of the PR: \
>> `$ git checkout pull/946` \
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>> View PR using the GUI difftool: \
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>> 
>> </details>
>
> Testing notes:
> 
> On a cgroups v2 system with glibc 2.33, specifying `-Djdk.test.docker.image.version=hirsute` (the version of ubuntu with a matching libc version),  8 tests pass; 1 fails - containers/cgroup/PlainRead.java - which is expected (to be fixed in backport of [JDK-8278951](https://bugs.openjdk.java.net/browse/JDK-8278951))
> 
> Running tests on a cgroups v1 system now.

@jmtd Please request for backport approval on the bug.

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PR: https://git.openjdk.java.net/jdk11u-dev/pull/946