[jdk8u-dev] RFR: 8239785: Cgroups: Incorrect detection logic on old systems in hotspot [v8]

[Severin Gehwolf]

On Fri, 9 Dec 2022 15:34:56 GMT, Jonathan Dowland <jdowland at openjdk.org> wrote:

>> This is a backport of add18914fb1294999877b563c734a25b4c17b922 for cgroups v2 support injdk8u-dev, via the 11u backport.
>> 
>> It does not apply clean:
>> 
>>  * context issues for changes made for the different approach for logging in 8u
>>  * copyright lines
>> 
>> Small amount of re-working of new code that used `log_trace`/`log_debug` to use the 8u approach.
>
> Jonathan Dowland 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. The pull request contains five additional commits since the last revision:
> 
>  - Update file path in comment
>  - Severin's test fixes. Thanks!
>  - Move test to a more 8u-appropriate location
>    
>    Container (cgroups, docker) tests in 8u reside in
>    hotspot/test/runtime/containers
>  - remove duplicate include of osContainer_linux
>    
>    With the backport of 8189762, the include of osContainer_linux was
>    moved to a later #ifdef stanza, relative to the original. This caused
>    a context problem with this backport.
>  - 8239785: Cgroups: Incorrect detection logic on old systems in hotspot
>    
>    Return NULL subsystem if no cgroup controllers are mounted.
>    
>    Reviewed-by: sgehwolf
>    Backport-of: add18914fb1294999877b563c734a25b4c17b922

Looks good. The bug is a approved. Please integrate.

-------------

Marked as reviewed by sgehwolf (Reviewer).

PR: https://git.openjdk.org/jdk8u-dev/pull/135