[jdk21u-dev] RFR: 8322420: [Linux] cgroup v2: Limits in parent nested control groups are not detected

[Jan Kratochvil]

On Thu, 16 Jan 2025 11:09:04 GMT, Jan Kratochvil <jkratochvil at openjdk.org> wrote:

> The goal is to backport: [8322420](https://bugs.openjdk.org/browse/JDK-8322420): [Linux] cgroup v2: Limits in parent nested control groups are not detected
> 
> There are included some pre-/post-requisite patches to be squashed as a single commit. Or should I submit 14 separate github pull requests / backports?
> 
> In a chronological order (the reverse of `git log`):
> 
> - [c96cbe481c86800b76e220374b24b6671984adb7](https://github.com/openjdk/jdk/commit/c96cbe481c86800b76e220374b24b6671984adb7)
>     [8313083](https://bugs.openjdk.org/browse/JDK-8313083) Print 'rss' and 'cache' as part of the container information
> - [cab74b075e4572529a21bf8ac652ec2f1ab4fcaf](https://github.com/openjdk/jdk/commit/cab74b075e4572529a21bf8ac652ec2f1ab4fcaf)
>     [8324287](https://bugs.openjdk.org/browse/JDK-8324287) Record total and free swap space in JFR
>   patch reduced only to files:
>    - src/hotspot/os/linux/os_linux.cpp
>    - src/hotspot/share/runtime/os.hpp
> - [3d106cb091de6b6ef2a9bf483fb0f5c98c28263c](https://github.com/openjdk/jdk/commit/3d106cb091de6b6ef2a9bf483fb0f5c98c28263c)
>     [8325139](https://bugs.openjdk.org/browse/JDK-8325139) JFR SwapSpace event - add free swap space information on Linux when running in a container environment
> - [c1281e6b45ed167df69d29a6039d81854c145ae6](https://github.com/openjdk/jdk/commit/c1281e6b45ed167df69d29a6039d81854c145ae6)
>     [8324678](https://bugs.openjdk.org/browse/JDK-8324678) Replace NULL with nullptr in HotSpot gtests
>   patch reduced only to files:
>    - test/hotspot/gtest/runtime/test_os_linux_cgroups.cpp
> - [09d4936657a0bdc122a4ab80735bd9c8c109839c](https://github.com/openjdk/jdk/commit/09d4936657a0bdc122a4ab80735bd9c8c109839c)
>     [8252136](https://bugs.openjdk.org/browse/JDK-8252136) Several methods in hotspot are missing "static"
>   patch reduced only to files:
>    - test/hotspot/gtest/os/linux/test_cgroupSubsystem_linux.cpp
> - [e889b460c03b3887ec5477fa734c430d3c3a41c8](https://github.com/openjdk/jdk/commit/e889b460c03b3887ec5477fa734c430d3c3a41c8)
>     [8327071](https://bugs.openjdk.org/browse/JDK-8327071) [Testbug] g-tests for cgroup leave files in /tmp on linux
> - [3d4eb159e6d597f37081faf21b7e3f0f1af299e5](https://github.com/openjdk/jdk/commit/3d4eb159e6d597f37081faf21b7e3f0f1af299e5)
>     [8302744](https://bugs.openjdk.org/browse/JDK-8302744) Refactor Hotspot container detection code
> - [d0052c032cc1927e7e92f04cfedab20e0c4e0293](https://github.com/openjdk/jdk/commit/d0052c032cc1927e7e92f04cfedab20e0c4e0293)
>     [8333326](https://bugs.openjdk....

I expect I should rather do separate backports of each of the commits.

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PR Comment: https://git.openjdk.org/jdk21u-dev/pull/1330#issuecomment-2595927272