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SubjectRe: [patch 7/7] oom: prevent possible OOM_DISABLE livelock
On Tue, 5 May 2009, Nick Piggin wrote:

> On Mon, May 04, 2009 at 05:27:07PM -0700, David Rientjes wrote:
> > It is currently possible to livelock the oom killer if a task is chosen
> > for oom kill and another thread sharing the same memory has an oom_adj
> > value of OOM_DISABLE. This occurs because oom_kill_task() repeatedly
>
> Hmm, but didn't the last patch make it a per-mm value?
>

Yes, but this avoids taking task_lock(p) in select_bad_process() and moves
all locking to badness(). It also introduces new behavior that anything
with a badness score of 0 won't be killed, which wasn't explicit before
(we relied on oom_kill_task() to reject it).


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