Re: Hibernation Redesign

[Pavel Machek]

Hi!

> > > Freezing of tasks is slowing down suspend.  Don't know how serious
> > > this is, suspend is pretty fast, but could possibly be even faster.
> > 
> > It's FUD. Freezing of tasks normally takes next to no time. I've never 
> > understood the rediculously long timeout it has. If freezing succeeds, all 
> > processes are frozen within 1/2 a second tops. If it fails, nothing is going 
> > to change in the following 19.5 seconds (or whatever it is if I don't 
> > remember the value properly).
> 
> Right.  The 20s timeout is again a sign of brokenness.

Well, "scenario 1/2 - simple/tricky deadlock" is a sign of brokenness,
too.

> If we expect something to fail, it should fail immediately, without
> waiting for arbitrary timeouts.

Agreed that freezer is not nice, but core issue here is that fuse
allows userspace tasks to hold kernel locks... bad.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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