[CRIU] [PATCH] scripts: Add ACT_PRE_RESUME stage

[Cyrill Gorcunov]

On Tue, Jan 10, 2017 at 04:54:39PM +0300, Pavel Emelyanov wrote:
> >>
> >> Can you describe what exactly happens between POST_RESTORE and PRE_RESUME?
> > 
> >  - depopulate_roots_yard (opening new files)
> >  - network_unlock_internal (running iptables)
> >  - attach_to_tasks (parsing procfs output: open files, allocating new memory)
> >  - catch_tasks (same as attach_to_tasks)
> >  - finalize_restore (allocate new memory)
> 
> Can all this stuff happen before POST_RESUME?

It can I think, but as I already say we can't simply
toss run-script points because it is API.

> 
> > Note we've to do resume inside veX
> 
> Cyrill, veX is not something CRIU is aware of ;)

I simply explained why we need this new run-script hook.
Seriously it's a cheap and might be useful for other
purposes, say for debug. Of course I can carry this custom
patch in my vz7 criu instance (and I already do) but this
is quite inconvenient. After all criu should fit all the
wrappers (vz7, docker, lxc).