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    SubjectRe: How much of a mess does OpenVZ make? ;) Was: What can OpenVZ do?
    On Thu, Feb 26, 2009 at 07:30:16PM +0100, Greg Kurz wrote:
    > On Thu, 2009-02-26 at 18:33 +0100, Ingo Molnar wrote:
    > > I think the main question is: will we ever find ourselves in the
    > > future saying that "C/R sucks, nobody but a small minority uses
    > > it, wish we had never merged it"? I think the likelyhood of that
    > > is very low. I think the current OpenVZ stuff already looks very
    >
    > We've been maintaining for some years now a C/R middleware with only a
    > few hooks in the kernel. Our strategy is to leverage existing kernel
    > paths as they do most of the work right.
    >
    > Most of the checkpoint is performed from userspace, using regular
    > syscalls in a signal handler or /proc parsing. Restart is a bit trickier
    > and needs some kernel support to bypass syscall checks and enforce a
    > specific id for a resource. At the end, we support C/R and live
    > migration of networking apps (websphere application server for example).
    >
    > >From our experience, we can tell:
    >
    > Pros: mostly not-so-tricky userland code, independent from kernel
    > internals
    > Cons: sub-optimal for some resources

    How do you restore struct task_struct::did_exec ?


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