- 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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