[PATCH 1/3] powerpc: bare minimum checkpoint/restart implementation

[Cedric Le Goater]

> More specifically, I envision restart to work like this:
> 
> 1) user invokes user-land utility (e.g. "cr --restart ..."
> 2) 'cr' will create a new container
> 3) 'cr' will start a child in that container

process 1 in its private namespaces.

> 4) child will create rest of tree (in kernel or in user space - tbd)
> 5) each task in that tree will restore itself
> 6) 'cr' monitors this process
> 7) if all goes well - 'cr' report ok.
> 8) if something goes bad, 'cr' notices and notifies caller/user

that's MCR implementation of restart. 
 
> so tasks that are restarting may just as well die badly - we don't care.

just sigkill them, but at end, before releasing the container from 
a frozen state, we have to make sure the right number of tasks have 
restarted ... so you need to track them along the way.

C.