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Description of problem:

Using cgroup parameter ‘ControlGroupAttribute=attribute value’, systemd can set various low-level control group parameters exposed by Linux cgroup controllers. But actually this setting doesn’t work.

Version-Release number of selected component (if applicable):
systemd-208-11
How reproducible:


Steps to Reproduce:
1. write a unit file for test like this：
# vim /usr/lib/systemd/system/testdd.service
Description=dd test
[Service]
Type=simple
ExecStart=/usr/bin/dd if=/dev/sdb of=/dev/null
ControlGroupAttribute=memory.swappiness 70
[Install]
WantedBy=multi-user.target
2. restart testdd.service unit. 
# systemctl daemon-reload
# systemctl restart testdd.service
3. check that if the pseudo file /sys/fs/cgroup/memory/system.slice/testdd.service/memory.swappiness exist and the value is 70.
# cat /sys/fs/cgroup/memory/system.slice/testdd.service/memory.swappiness
Actual results:
1. after step3,the pseudo file isn’t created, acutally the control group /memory/system.slice/testdd.service isn’t created.

Expected results:
1. after step 3, value of memory.swappiness is set to 70.
# cat /sys/fs/cgroup/memory/system.slice/testdd.service/memory.swappiness.
70

Additional info:

This option was removed in 208

From 208 release notes:
* As discussed earlier, the low-level cgroup configuration
  options ControlGroup=, ControlGroupModify=,
  ControlGroupPersistent=, ControlGroupAttribute= have been
  removed. Please use high-level attribute settings instead as
  well as slice units.   

And some other info
http://lwn.net/Articles/555923/