Re: [PATCH net-next v2 2/4] cgroup: bpf: Add BPF_MAP_TYPE_CGROUP_ARRAY

[Daniel Borkmann]

On 06/23/2016 11:13 PM, Tejun Heo wrote:
> Hello,
>
> On Thu, Jun 23, 2016 at 11:42:31AM +0200, Daniel Borkmann wrote:
> > I presume it's a valid use case to pin a cgroup map, put fds into it and
> > remove the pinned file expecting to continue to match on it, right? So
> > lifetime is really until last prog using a cgroup map somewhere gets removed
> > (even if not accessible from user space anymore, meaning no prog has fd and
> > pinned file was removed).
>
> Yeap, from what I can see, the cgroup will stay around (even if it
> gets deleted) as long as the bpf rule using it is around and that's
> completely fine from cgroup side.

Ok, thanks for confirming!

> Thanks.