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    SubjectRe: [Devel] Re: [PATCH 08/10] Introduce functions to restart a process
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    On Thursday 23 October 2008 17:49 Dave Hansen wrote:
    > On Thu, 2008-10-23 at 13:54 +0400, Andrey Mirkin wrote:
    > > We are putting special structure on stack, which is used at the very end
    > > of the whole restart procedure to restore complex states (ptrace is one
    > > of such cases). Right now I don't need to use this structure as we have a
    > > deal with simple cases, but reservation of 256 bytes on stack is needed
    > > for future.
    >
    > Wow. So you're saying that, if this patch is accepted, we simply need
    > to accept that anything being checkpointed will use an extra 256 bytes
    > of stack? Seems like something to perhaps put in the changelog rather
    > than some completely undocumented assembly nugget.

    This 256 bytes will be used only during restart procedure and only by our
    module. As you can see in i386_ret_from_resume we are restoring it back. So,
    when process will return to user space it will not have extra 256 bytes
    reserved on stack already. I will add information about it to documentation
    and changelog.

    Andrey


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