Re: suspend2 merge (was Re: [Suspend2-devel] Re: CFS and suspend2:hang in atomic copy)

From: Alan Cox
Date: Wed Apr 25 2007 - 18:55:58 EST

> 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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