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    SubjectRe: [CRIU] [PATCH] Add VDSO time function support for x86 32-bit kernel
    On 12/14/2012 06:20 AM, Andy Lutomirski wrote:
    > On Thu, Dec 13, 2012 at 6:18 PM, H. Peter Anvin <hpa@zytor.com> wrote:
    >> Wouldn't the vdso get mapped already and could be mremap()'d. If we
    > really need more control I'd almost push for a device/filesystem node
    > that could be mmapped the usual way.
    >
    > Hmm. That may work, but it'll still break ABI. I'm not sure that
    > criu is stable enough yet that we should care. Criu people?

    It's not yet, but we'd still appreciate the criu-friendly vdso redesign.

    > (In brief summary: how annoying would it be if the vdso was no longer
    > just a bunch of constant bytes that lived somewhere?)

    It depends on what vdso is going to be. In the perfect case it should
    a) be mremap-able to any address (or be at fixed address _forever_, but
    I assume this is not feasible);
    b) have entry points at fixed (or somehow movable) places.

    I admit that I didn't understand your question properly, if I did,
    please correct me.

    Thanks,
    Pavel


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