On Fri, 2009-02-27 at 01:17 +0300, Alexey Dobriyan wrote: > 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 ? With sys_execve(). -- Gregory Kurz gkurz@xxxxxxxxxx Software Engineer @ IBM/Meiosys http://www.ibm.com Tel +33 (0)534 638 479 Fax +33 (0)561 400 420 "Anarchy is about taking complete responsibility for yourself." Alan Moore. _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
