Protection against container fork bombs [WAS: Re: memcg with kmem limit doesn't recover after disk i/o causes limit to be hit]

[Alin Dobre]

On 22/04/14 21:05, Richard Davies wrote:
> Dwight Engen wrote:
>> Richard Davies wrote:
>>> Vladimir Davydov wrote:
>>>> In short, kmem limiting for memory cgroups is currently broken. Do
>>>> not use it. We are working on making it usable though.
> ...
>>> What is the best mechanism available today, until kmem limits mature?
>>>
>>> RLIMIT_NPROC exists but is per-user, not per-container.
>>>
>>> Perhaps there is an up-to-date task counter patchset or similar?
>>
>> I updated Frederic's task counter patches and included Max Kellermann's
>> fork limiter here:
>>
>> http://thread.gmane.org/gmane.linux.kernel.containers/27212
>>
>> I can send you a more recent patchset (against 3.13.10) if you would
>> find it useful.
> 
> Yes please, I would be interested in that. Ideally even against 3.14.1 if
> you have that too.

Any chance for a 3.15 rebase, since the changes from cgroup_fork() makes
the operation no longer trivial.

Cheers,
Alin.