[RFD] Merge task counter into memcg

[KAMEZAWA Hiroyuki]

(2012/04/18 1:52), Glauber Costa wrote:

> 
>>> In short, I don't think it's better to have task-counting and fd-counting in memcg.
>>> It's kmem, but it's more than that, I think.
>>> Please provide subsys like ulimit.
>>
>> So, you think that while kmem would be enough to prevent fork-bombs,
>> it would still make sense to limit in more traditional ways
>> (ie. ulimit style object limits).  Hmmm....
>>
> 
> I personally think this is namespaces business, not cgroups.
> If you have a process namespace, an interface that works to limit the 
> number of processes should keep working given the constraints you are 
> given.
> 
> What doesn't make sense, is to create a *new* interface to limit 
> something that doesn't really need to be limited, just because you
> limited a similar resource before.
> 


Ok, limitiing forkbomb is unnecessary. ulimit+namespace should work.
What we need is user-id namespace, isn't it ? If we have that, ulimit
works enough fine, no overheads.

Thanks,
-Kame