[Devel] Re: [RFC][PATCH 0/4] Container Freezer

[Serge E. Hallyn]

Quoting Cedric Le Goater (clg at fr.ibm.com):
> Serge E. Hallyn wrote:
> > Quoting Cedric Le Goater (clg at fr.ibm.com):
> >> This patchset is a prototype using the container infrastructure and
> >> the swsusp freezer to freeze a group of tasks.
> >>
> >> 2 files are defined by the freezer subsystem in the container
> >> filesystem :
> >>
> >>    * "freezer.freeze"
> >>
> >>      writing 1 will freeze all tasks and 0 unfreeze
> >>      reading will return the status of the freezer
> >>
> >>    * "freezer.kill"
> >>
> >>      writing <n> will send signal number <n> to all tasks
> >>
> >> * Usage :
> >>
> >>    # mkdir /containers/freezer
> >>    # mount -t container -ofreezer freezer  /containers/freezer
> >>    # mkdir /containers/freezer/0
> >>    # echo $some_pid > /containers/freezer/0/tasks
> > 
> > I'd like to point out that by composing this with the nsproxy subsystem
> > (which I've done and tested), you can
> > 
> > 	mount -t container -ons,freezer nsproxy /containers/freezer
> > 
> > Then you get a new freezer subsystem automatically for every unshare
> > that you do, avoiding the need to to manually do
> > 
> > 	echo $some_pid > /containers/freezer/0/tasks
> 
> I guess that's true for any subsystem. right ?

Sure, but when this goes to lkml I expect there to be plenty of people
who don't know about that quite yet, and might come away thinking this
is more intrusive to use than it is.

thanks,
-serge
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