Description of problem:
This one is missing blkio subsystem. More details can be found in kernel source kernel-2.6.32/linux-2.6.32.x86_64/Documentation/cgroups/blkio-controller.txt
Thanks -- blkio is documented in build 0.6-2 (section 3.1)
Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.