pidns: Make pid accounting and pid_max per namespace

Zefan Li lizefan at
Sat Oct 10 03:35:16 UTC 2015

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
> 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.

Mainline kernel already supports per-cgroup pid limit, which should solve
your problem.

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