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

[Cedric Le Goater]

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 ?

C.
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