Messages in this thread |  | | | Date | Wed, 25 Apr 2007 23:57:18 +0100 | | From | Alan Cox <> | | Subject | Re: suspend2 merge (was Re: [Suspend2-devel] Re: CFS and suspend2: hang in atomic copy) |
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> Tell me, what does "suspend" do, and what does "freeze" (snapshot) do? > > And name *one* thing that have in common.
Both of them have to ensure you can make a consistent snapshot. Doing that means you've got to be able to define a single "point" at which the snapshot is made and is internally self-consistent. That in both cases tends to mean you've got to ensure nothing occurs which pees on the image while you are making that snapshot (such as outstanding O_DIRECT I/O to user pages).
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