[Devel] Re: How much of a mess does OpenVZ make? ; ) Was: What can OpenVZ do?

[Alexey Dobriyan]

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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