Re: Android low memory killer vs. memory pressure notifications

[KOSAKI Motohiro]

> - Use memory controller cgroup (CGROUP_MEM_RES_CTLR) notifications from
>    the kernel side, plus userland "manager" that would kill applications.
>
>    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.
>
>    0.5% doesn't sound too bad, but 5MB does, quite a little bit. So,
>    mem_cg feels like an overkill for this simple task (see the driver at
>    the very bottom).

Kamezawa-san, Is 20bytes/page still correct now? If I remember 
correctly, you improved space efficiency of memcg.

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