Re: Re: freeze_processes questions

Pavel Machek
2005-04-06T21:17:39Z

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Hi!

> > > I don't think Rafael is suggesting ignoring them. He's suggesting what
> > > I'm already doing:
> > > - Signal so they enter the freezer if they leave the state;
> > > - Don't count them when deciding whether freezing failed;
> > > - Handle the case where they don't leave the state until post resume (I
> > > let them enter the refrigerator, but have code in there to check whether
> > > the freezer is still on).
> > >
> > > In this way, I handle kseriod and anything else uninterruptible without
> > > any problems.
> >
> > What happens if a process owns a lock needed to suspend a device and it is
> > waiting in TASK_UNINTERRUPTIBLE?
>
> Well, we're in trouble. :-)
>
> However, if any process that we have frozen owns such a lock, we're in trouble
> too.

No, we are not. Processes can't own any locks when they are in
refrigerator... It is not ok to call refrigerator from any context
where you own a lock.

OTOH it is okay to enter TASK_UNINTERRUPTIBLE with locks held.

Pavel
--
Boycott Kodak -- for their patent abuse against Java.