Re: [RFD] Merge task counter into memcg

From: KAMEZAWA Hiroyuki
Date: Wed Apr 18 2012 - 02:53:28 EST

(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.


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