Messages in this thread |  | | | Date | Mon, 23 Jun 2008 09:16:01 +0200 | | From | Pavel Machek <> | | Subject | Re: freeze vs freezer |
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Hi!
(replying to *very* old mail).
>>>> We wait until they can continue. >>> >>> So if I have a process blocked on an unavilable NFS mount, I can't >>> suspend? >> >> That's correct, you can't. >> >> [And I know what you're going to say. ;-)] > > Why exactly does suspend/hibernation depend on "TASK_INTERRUPTIBLE" instead > of a zero preempt_count()? Really what we should do is just iterate over > all of the actual physical devices and tell each one "Block new IO requests > preemptably, finish pending DMA, put the hardware in low-power mode, and > prepare for suspend/hibernate". As long as each driver knows how to do > those simple things we can have an entirely consistent kernel image for > both suspend and for hibernation.
Patch would be welcome, actually. It turns out blocking new IO-requests is not completely trivial. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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