pidns: Make pid accounting and pid_max per namespace

Zhang Haoyu yuzhou at mogujie.com
Sat Oct 10 04:40:32 UTC 2015


On 10/10/15 11:35, Zefan Li wrote:
> On 2015/10/9 18:29, Zhang Haoyu wrote:
>> I started multiple docker containers in centos6.6(linux-2.6.32-504.16.2),
>> and there's one bad program was running in one container.
>> This program produced many child threads continuously without free, so more and
>> more pid numbers were consumed by this program, until hitting the pix_max limit (32768
>> default in my system ).
>>
>> What's worse is that containers and host share the pid numbers resource, so new program
>> cannot be produced any more in host and other containers.
>>
>> And, I clone the upstream kernel source from
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>> This problem is still there, I'm not sure.
>>
>> IMO, we should isolate the pid accounting and pid_max between pid namespaces,
>> and make them per pidns.
>> Below post had request for making pid_max per pidns.
>> http://thread.gmane.org/gmane.linux.kernel/1108167/focus=1111210
>>
>
> Mainline kernel already supports per-cgroup pid limit, which should solve
> your problem.
>
What about pid accounting?
If one pidns consume too many pids, dose it influence the other pid namespaces?

Thanks,
Zhang Haoyu



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