Epic Goal

• The Kernel API was updated for RHEL 9, so the old approach of setting the `sched_domain` in `/sys/kernel` is no longer available. Instead, cgroups have to be worked with directly.
• Both CRI-O and PAO need to be updated to set the cpuset of containers and other processes correctly, as well as set the correct value for sched_load_balance

Why is this important?

• CPU load balancing is a vital piece of real time execution for processes that need exclusive access to a CPU. Without this, CPU load balancing won't work on RHEL 9 with Openshift 4.13

Scenarios

1. As a developer on Openshift, I expect my pods to run with exclusive CPUs if I set the PAO configuration correctly

Acceptance Criteria

• CI - MUST be running successfully with tests automated
• Release Technical Enablement - Provide necessary release enablement details and documents.
• ...

Dependencies (internal and external)

1. ...

Previous Work (Optional):

1. ...

Open questions::

1. ...

Done Checklist

• CI - CI is running, tests are automated and merged.
• Release Enablement <link to Feature Enablement Presentation>
• DEV - Upstream code and tests merged: <link to meaningful PR or GitHub Issue>
• DEV - Upstream documentation merged: <link to meaningful PR or GitHub Issue>
• DEV - Downstream build attached to advisory: <link to errata>
• QE - Test plans in Polarion: <link or reference to Polarion>
• QE - Automated tests merged: <link or reference to automated tests>
• DOC - Downstream documentation merged: <link to meaningful PR>