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

[Andrew Morton]

On Thu, 30 Apr 2009 15:38:53 -0700 (PDT)
David Rientjes <rientjes@xxxxxxxxxx> 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?

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