Cgroups in OpenSuSE 12.1

I don’t know what is better OpenSuSE forum for my questions.
I plan to work w/cgroups in OpenSuSE 12.1. But before setting of /etc/cgconfig.conf and
/etc/cgrules.conf files or before using of cgcreate/cgset/cgclassify etc for cgroups setting I found
that I have some basic misunderstandings.

  1. Do I understand correctly that (by default) after OpenSuSE 12.1 booting there is 2 active cgroups
    hierarchies - systemd and cpuset ?

  2. boot.cgroup service in /etc/init.d is used for mounting of /sys/fs/cgroup.
    chkconfig says that boot.cgroup is off (chkconfig forwarded request to systemd confirms - “no active”),

but

/etc/init.d/boot.cgroup status

says that this service is “running”. And /sys/fs/cgroup really contains some subdirectories for systemd
etc.
Why there is such contradiction ?

  1. /usr/src/linux/Documentation/cgroups as also OpenSuSE System Analysis and Tuning Guide
    describes creation and management of cgroups using /sys/fs/cgroup

Do I understand correctly that cgroup hierachy may be created (mounted) at any appropriate point in my
filesystems, but using of other-than-/sys/fs/cgroup point is better - to avoid potential “conflicts”
w/cgroups created by OpenSuSE itself ?

BTW, do I unerstand correctly that

mount -t tmpfs … /sys/fs/cgroup

(from kernel documentation examples) has no immediate relation to cgroups itself - it’s simple the
command which creates some appropriate mounting point for subsequent mounting of cgroups ?

  1. ps xawf -e -o pid,users,cgroup,args

gives me

PID USER CGROUP COMMAND
2 root 9:perf_event:/?8:blkio:/?7 [kthreadd]
3 root _ 9:perf_event:/?8:blkio _ [ksoftirqd/0]

1345 root _ 9:perf_event:/?8:blkio _ [kworker/1:0]
1 root 9:perf_event:/?8:blkio:/?7 /sbin/init
318 root 9:perf_event:/?8:blkio:/?7 /sbin/udevd
1203 root _ 9:perf_event:/?8:blkio _ /sbin/udevd
1207 root _ 9:perf_event:/?8:blkio _ /sbin/udevd
596 root 9:perf_event:/?8:blkio:/?7 /lib/systemd/systemd-stdout-syslog-bridge

1009 root 9:perf_event:/?8:blkio:/?7 /usr/sbin/sshd -o PidFile=/var/run/sshd.init.pid
1035 root 9:perf_event:/?8:blkio:/?7 /usr/sbin/console-kit-daemon --no-daemon
1102 root 9:perf_event:/?8:blkio:/?7 /usr/lib/polkit-1/polkitd --no-debug

what means that all the processes belongs to blkio cgroup. Why ?