Re: Runaway process and oom-killer

From: Andrea Arcangeli
Date: Wed Jun 13 2007 - 11:26:24 EST

On Wed, Jun 13, 2007 at 09:10:33AM -0600, Chris Friesen wrote:
> Helge Hafting wrote:
> >My guess:
> >Something needs memory but finds there is none to be had
> >oom-killer is invoked and targets myapp.
> >myapp takes some time to die. Particularly, the memory it uses
> >isn't freed up instantly.
> Has anyone considered actually bumping up the priority of the task being
> killed so that it gets to run and free up its resources in a timely manner?
> We've done some experimenting with actually putting it in SCHED_RR and
> it seems to help (in the case of other busy SCHED_RR tasks on the
> system). Admittedly we have an older kernel, so behaviour may be
> different now.

Replacing the timeslice boost with sched-rr would probably be an ok
cleanup, but I'm unsure if it risks to break the other RT tasks
(especially when folks misuse a soft-RT design to do hard-RT work,
with userland drivers running with RT privilege mapping iommu

Most cpus goes idle as soon as the oom killer is entered so it
probably doesn't make much difference anyway. I didn't remove the
timeslice hack just because there wasn't any compelling reason to
remove it but it's probably not making much difference.
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