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    SubjectRe: [RFC PATCH 0/4] (Take 2): transcendent memory ("tmem") for Linux
    Dan Magenheimer wrote:

    > But this means that either the content of that page must have been
    > preserved somewhere or the discard fault handler has sufficient
    > information to go back and get the content from the source (e.g.
    > the filesystem). Or am I misunderstanding?

    The latter. Only pages which can be fetched from
    source again are marked as volatile.

    > But IMHO this is a corollary of the fundamental difference. CMM2's
    > is more the "VMware" approach which is that OS's should never have
    > to be modified to run in a virtual environment.

    Actually, the CMM2 mechanism is quite invasive in
    the guest operating system's kernel.

    > ( I don't see why CMM2 provides more flexibility.

    I don't think anyone is arguing that. One thing
    that people have argued is that CMM2 can be more
    efficient, and easier to get the policy right in
    the face of multiple guest operating systems.

    --
    All rights reversed.


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