[Devel] Re: --freezer option to /bin/restart

[Serge E. Hallyn]

Quoting Sukadev Bhattiprolu (sukadev at linux.vnet.ibm.com):
> >>>> Is there a way to specify that the restarted application belong
> >>>> to a new (yet-to-be created) cgroup AND to leave the application
> >>>> FROZEN after restart ? Or would we need a new command line option
> >>>> and field in 'struct app_restart_args' to specify this ?
> >>> This is exactly what --freezer does. Well, alsmot - except for
> >>> "yet-to-be created". Do you want 'restart' to create the cgroup
> >>> if it doesn't exist ?
> 
> If we restart with one of the CLONE_NEW flags like CLONE_NEWPID, a
> new cgroup is automatically created right ? So, in effect, all I want

I don't mount ns cgroup, so no, not on my system.

> at this point is to be able to leave the restarted application in the
> FROZEN state (ie specify the RESTART_FROZEN flag to sys_restart()).
> 
> >>
> >> I thought that was what Suka was asking for.
> >
> > If he wants to add it to the 'restart' utility, then sure, with
> > a proper argument.
> 
> Ok. Will add a new field to struct app_restart_args to pass the
> RESTART_FROZEN flag to sys_restart(). We can then either add -F option
> or allow --freezer without argument to choose this behavior.
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