Re: [patch] oom: prevent livelock when oom_kill_allocating_task isset

[David Rientjes]

On Thu, 30 Apr 2009, Andrew Morton wrote:

> > When /proc/sys/vm/oom_kill_allocating_task is set for large systems that
> > want to avoid the lengthy tasklist scan, it's possible to livelock if
> > current is ineligible for oom kill.  This normally happens when it is set
> > to OOM_DISABLE, but is also possible if any threads are sharing the same
> > ->mm with a different tgid.
> 
> OK...  And how does the patch address this problem?
> 
> <reads the code>
> 
> Seems that if we were unable to kill `current', we'll ignore the
> oom_kill_allocating_task setting and will fall back the slow tasklist
> scan?
> 

Yes, sorry.  The annotated changelog you have added to -mm is correct, 
thanks.
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