Re: Android low memory killer vs. memory pressure notifications

From: KOSAKI Motohiro
Date: Mon Dec 19 2011 - 11:11:45 EST


- 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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