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!
Linus
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