The main downside of this approach is that mem_cg needs 20 bytes per
  page (on a 32 bit machine). So on a 32 bit machine with 4K pages
  that's approx. 0.5% of RAM, or, in other words, 5MB on a 1GB machine.

The obvious question would be why? Would fixing memcg make more sense ?

The only problem I see with having a user space manager is that manager
probably has to be mlock to avoid awkward fail cases and that may in fact
make it smaller kernel side.

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