Re: freeze_processes questions

Pavel Machek
2005-04-05T22:57:51Z

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Hi!

> > > 2) We can try to force uninterruptible tasks to get their "signals" anyway using
> > > wake_up_state() directly on them (which I don't like as much).
> >
> > They are probably uninterruptible for a reason...
> >
> > If something is staying in UNINTERRUPTIBLE for more than 1 second, it
> > is going to cause problems elsewhere, anyway. Do you see that happening?
>
> Probably. Please see, for example, this message sent to l-k:
>
> http://marc.theaimsgroup.com/?l=linux-kernel&m=111268969510393&w=2

...hmm, perhaps kseriod needs suspend/resume support, or something;
but that does not mean we should handle *all* uninterruptible tasks
that way.

> I can easily trigger a similar behavior with an uninterruptible task and I
> have some problems with freezing tasks on SMP that smell like this too.
>
> If we are going to ignore uninterruptible tasks, I'd propose to set PF_FREEZE
> and TIF_SIGPENDING for them without counting them as "todo" in

You can't just ignore uninterruptible tasks, sorry.

OTOH, if you want working refrigerator, Nigel has one ;-). We were
talking about merging it to mainline few times already...
Pavel
--
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