Bug#654598: Please enable CONFIG_CGROUP_MEM_RES_CTLR_SWAP

[Marcus Osdoba <marcus.osdoba@googlemail.com>]

I guess this is done since 3.0.0~rc1-1~experimental.1 ?

linux-2.6 (3.0.0~rc1-1~experimental.1) experimental; urgency=low

  * cgroups: Disable memory resource controller by default. Allow it
    to be enabled using kernel parameter 'cgroup_enable=memory'.
[...]
  * cgroups: Enable CGROUP_MEM_RES_CTLR_SWAP but not
    CGROUP_MEM_RES_CTLR_SWAP_ENABLED. Swap accounting can be enabled
    using kernel parameter 'swapaccount'
[...]

You need to use a kernel parameter to active it - equal to the memory 
controller.