Re: Android low memory killer vs. memory pressure notifications

[Hiroyuki Kamezawa]

2011/12/20 KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxx>:
>> - 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.
>
Johannes removed 4 bytes. It's in upstream.
Johannes removed 8bytes. It's now in linux-next.
I'm preparing a patch to remove more 4 bytes.

Thanks,
-Kame
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