Re: [PATCH 4/4] oom: don't kill random process

[David Rientjes]

On Tue, 10 May 2011, KOSAKI Motohiro wrote:

> CAI Qian reported oom-killer killed all system daemons in his
> system at first if he ran fork bomb as root. The problem is,
> current logic give them bonus of 3% of system ram. Example,
> he has 16GB machine, then root processes have ~500MB oom
> immune. It bring us crazy bad result. _all_ processes have
> oom-score=1 and then, oom killer ignore process memroy usage
> and kill random process. This regression is caused by commit
> a63d83f427 (oom: badness heuristic rewrite).
> 
> This patch changes select_bad_process() slightly. If oom points == 1,
> it's a sign that the system have only root privileged processes or
> similar. Thus, select_bad_process() calculate oom badness without
> root bonus and select eligible process.
> 

This second (and very costly) iteration is unnecessary if the range of 
oom scores is increased from 1000 to 10000 or 100000 as suggested in the 
previous patch.
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