How do you use cpusets on pop?

I've been trying to create a new cpuset to run some programs with a reduced set of cpu cores, but I seem to be fighting with something my system is already doing because the instructions from the kernel manual don't work. I find cpuset is already mounted, but when I create a directory in /sys/fs/cgroup/cpuset it does not end up with cpuset.cpus in it. It seems cpusets are aleady being used by something else, so not sure how I'd go about this?

Manual with step by step tutorial: https://www.kernel.org/doc/html/latest/admin-guide/cgroup-v1/cpusets.html