On Thu, Dec 05, 2024 at 02:51:01PM -0500, Waiman Long wrote:
Isolated CPUs are not allowed to be used in a non-isolated partition. The only exception is the top cpuset which is allowed to contain boot time isolated CPUs.
Commit ccac8e8de99c ("cgroup/cpuset: Fix remote root partition creation problem") introduces a simplified scheme of including only partition roots in sched domain generation. However, it does not properly account for this exception case. This can result in leakage of isolated CPUs into a sched domain.
Fix it by making sure that isolated CPUs are excluded from the top cpuset before generating sched domains.
Also update the way the boot time isolated CPUs are handled in test_cpuset_prs.sh to make sure that those isolated CPUs are really isolated instead of just skipping them in the tests.
Fixes: ccac8e8de99c ("cgroup/cpuset: Fix remote root partition creation problem") Signed-off-by: Waiman Long longman@redhat.com
Applied to cgroup/for-6.13-fixes.
Thanks.