[jdk21u-dev] RFR: 8302744: Refactor Hotspot container detection code

[Severin Gehwolf]

On Mon, 14 Apr 2025 09:11:37 GMT, Jan Kratochvil <jkratochvil at openjdk.org> wrote:

> A patch 1 of 6 for: [[21u] Backport intention of 8322420: [Linux] cgroup v2: Limits in parent nested control groups are not detected](https://mail.openjdk.org/pipermail/jdk-updates-dev/2025-April/043206.html)
> 
> The backport is not clean:
> 
> - `src/hotspot/os/linux/cgroupV1Subsystem_linux.cpp` and `src/hotspot/os/linux/cgroupV2Subsystem_linux.cpp` are missing changed `CgroupV1Subsystem::memory_and_swap_usage_in_bytes()` as [JDK-8325139](https://github.com/openjdk/jdk/commit/3d106cb091de6b6ef2a9bf483fb0f5c98c28263c) has not been backported.
> 
> - `src/hotspot/os/linux/cgroupV1Subsystem_linux.cpp` and `src/hotspot/os/linux/cgroupV2Subsystem_linux.cpp` are missing changed `CgroupV1Subsystem::rss_usage_in_bytes()` as [JDK-8313083](https://github.com/openjdk/jdk/commit/c96cbe481c86800b76e220374b24b6671984adb7) has not been backported.
> 
> - deleted/renamed `test/hotspot/gtest/os/linux/test_cgroupSubsystem_linux.cpp` has missing `static` keywords as [JDK-8252136](https://github.com/openjdk/jdk/commit/09d4936657a0bdc122a4ab80735bd9c8c109839c) has not been backported.
> 
> The whole patchset has been tested on CentOS-7.9 (for cgroup v1) and on Fedora 40 (for cgroup v2) for `test/hotspot/jtreg/containers`.

This PR is ready. Please integrate @jankratochvil

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PR Comment: https://git.openjdk.org/jdk21u-dev/pull/1648#issuecomment-2966304019