Messages in this thread | | | Date | Wed, 25 Apr 2007 15:58:34 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: suspend2 merge (was Re: [Suspend2-devel] Re: CFS and suspend2: hang in atomic copy) |
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On Thu, 26 Apr 2007, Pavel Machek wrote: > > Suspend syncs caches/spins down. Freeze does not do anything. > > That's okay, I keep claiming "freeze" is subset of "suspend". Can you > name device where that is not true?
Sure. Like just about any PCI device that doesn't do things on its own.
A "freeze" does nothing at all, or perhaps shuts down the reader side (for something like a network controller).
A "suspend" does "write D3 to the suspend register". Absolutely zero in common.
> Remember we do > > suspend(PMSG_FREEZE) > atomic snapshot > resume() > write snapshot.
AND THAT IS STUPID. It mixes up "suspend()" and creating a snapshot in ways that are totally idiotic. There is nothing in common!
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