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Add a new script check-cgroup-match.sh that retrieves the cgroup of the main rtla process and compares it to the cgroup of the rtla workload threads. Add a new test based on this script, for both osnoise and timerlat tools, testing the variant of -C without argument (which sets the cgroup of the workload to the cgroup of the rtla main process). Note that this has to be tested in kernel mode to be significant for timerlat tool, as user workloads inherit the parent rtla process cgroup even without the option. Reviewed-by: Wander Lairson Costa <wander@redhat.com> Link: https://lore.kernel.org/r/20260423130558.882022-10-tglozar@redhat.com Signed-off-by: Tomas Glozar <tglozar@redhat.com>