Re: [PATCH 2/9] oom: oom_kill_process() doesn't select kthread child

From: KOSAKI Motohiro
Date: Wed Jun 30 2010 - 05:26:58 EST

> On Thu, 17 Jun 2010, KOSAKI Motohiro wrote:
> >
> > Now, select_bad_process() have PF_KTHREAD check, but oom_kill_process
> > doesn't. It mean oom_kill_process() may choose wrong task, especially,
> > when the child are using use_mm().
> >
> This type of check should be moved to badness(), it will prevent these
> types of tasks from being selected both in select_bad_process() and
> oom_kill_process() if the score it returns is 0.

No, process check order of select_bad_process() is certain meaningful.
Only PF_KTHREAD check can move into badness(). Okey, that's fix to
incorrect /proc/<pid>/oom_score issue.

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