Re: kthread, signals and PF_FREEZE (suspend)

[Pavel Machek <pavel@ucw.cz>]

Hi!

> > The workqueues have PF_IOTHREAD set and I'm only seeing those on my
> > machine that's why it doesn't fail.
> > 
> > But the migration threads for example call signal_pending() directly
> > after schedule() before checking PF_FREEZE and calling refrigerator()
> > (which BTW flushes all signals).
> 
> This will only happen on SMP systems with > 1 cpu though?  I don't
> think suspend works there anyway.
> 
> However, ksoftirqd will die I think: that will hurt if lots of irqs
> come in.
> 
> Pavel, what is the answer here?  Should the refrigerator code be in
> the kthread infrastructure?  Why does the workqueue code set
> PF_IOTHREAD?

I assumed that workqueues may be needed for harddisks to
function... If that's the case, it can't be simply stopped. 
								Pavel
-- 
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]