@AdrianDC, I just noticed that the cgroups are not populated. There is no cgroup/cpuset for background tasks, foreground tasks etc. (therefore Android task scheduling might not work properly)
Those are on /dev/cpuctl and /dev/cpuset (I don't know if Android uses /sys/fs/cgroup but it also contains nothing)
I don't know if it is a bug but, maybe this needs to be reported just in case ^_^
Not a bug, CPUSET is not implemented by the kernel.