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    SubjectRe: Back to the future.
    On Thu, 2007-04-26 at 09:56 -0700, Linus Torvalds wrote:
    > > which will map in the snapshot, return the mapped address and the size
    > > (and if you want to support snapshots > 4GB, be my guest, but I suspect
    > > you're actually *better* off just admitting that if you cannot shrink
    > > the snapshot to less than 32 bits, it's not worth doing)

    On Fri, 27 Apr 2007, Nigel Cunningham wrote:
    > That inherently limits the image to half of available ram (you need
    > somewhere to store the snapshot), so you won't get the full image you
    > express interest in below.

    It doesn't. We can make the userspace mapped pages copy-on-write. As long
    as the userspace makes sure there's not much activity during
    snapshot/shutdown, we will be fine. What we probably do need to copy is
    kernel pages.

    Pekka
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