From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Borkmann Subject: Re: [PATCH net-next v2 2/4] cgroup: bpf: Add BPF_MAP_TYPE_CGROUP_ARRAY Date: Thu, 23 Jun 2016 23:33:52 +0200 Message-ID: <576C55C0.7040800@iogearbox.net> References: <1466630252-3822277-1-git-send-email-kafai@fb.com> <1466630252-3822277-3-git-send-email-kafai@fb.com> <576BAF07.4020302@iogearbox.net> <20160623211326.GK3262@mtj.duckdns.org> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Cc: Martin KaFai Lau , cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Alexei Starovoitov , kernel-team-b10kYP2dOMg@public.gmane.org To: Tejun Heo Return-path: In-Reply-To: <20160623211326.GK3262-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org> Sender: cgroups-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: netdev.vger.kernel.org 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.