[jdk21u-dev] RFR: 8331560: Refactor Hotspot container detection code so that subsystem delegates to controllers [v2]

[Severin Gehwolf]

On Mon, 23 Jun 2025 12:19:40 GMT, Jan Kratochvil <jkratochvil at openjdk.org> wrote:

>> A patch 5 of 7 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)
>> 
>> It has a patch dependency on PR 3 of 7: https://github.com/openjdk/jdk21u-dev/pull/1661
>> 
>> This backport is not clean:
>> 
>>  - `src/hotspot/os/linux/cgroupSubsystem_linux.hpp`, `src/hotspot/os/linux/cgroupV1Subsystem_linux.cpp`, `src/hotspot/os/linux/cgroupV1Subsystem_linux.hpp`, `src/hotspot/os/linux/cgroupV2Subsystem_linux.cpp`, `src/hotspot/os/linux/cgroupV2Subsystem_linux.hpp` are missing `CgroupSubsystem::memory_and_swap_usage_in_bytes()` as [JDK-8325139](https://github.com/openjdk/jdk/commit/3d106cb091de6b6ef2a9bf483fb0f5c98c28263c) has not been backported.
>> 
>>  - `src/hotspot/os/linux/cgroupSubsystem_linux.hpp`, `src/hotspot/os/linux/cgroupV1Subsystem_linux.cpp`, `src/hotspot/os/linux/cgroupV1Subsystem_linux.hpp`, `src/hotspot/os/linux/cgroupV2Subsystem_linux.cpp`, `src/hotspot/os/linux/cgroupV2Subsystem_linux.hpp` are missing `CgroupSubsystem::rss_usage_in_bytes()` and `CgroupSubsystem::cache_usage_in_bytes()` as [JDK-8313083](https://github.com/openjdk/jdk/commit/c96cbe481c86800b76e220374b24b6671984adb7) 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.
>
> Jan Kratochvil has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase.

@jankratochvil Please fix the merge conflicts.

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PR Comment: https://git.openjdk.org/jdk21u-dev/pull/1662#issuecomment-2999685194