From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Daniel Borkmann <daniel-FeC+5ew28dpmcu3hnIyYJQ@public.gmane.org>
Cc: Martin KaFai Lau <kafai-b10kYP2dOMg@public.gmane.org>,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Alexei Starovoitov <ast-b10kYP2dOMg@public.gmane.org>,
kernel-team-b10kYP2dOMg@public.gmane.org
Subject: Re: [PATCH net-next v2 2/4] cgroup: bpf: Add BPF_MAP_TYPE_CGROUP_ARRAY
Date: Thu, 23 Jun 2016 17:13:26 -0400 [thread overview]
Message-ID: <20160623211326.GK3262@mtj.duckdns.org> (raw)
In-Reply-To: <576BAF07.4020302-FeC+5ew28dpmcu3hnIyYJQ@public.gmane.org>
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.
Thanks.
--
tejun
next prev parent reply other threads:[~2016-06-23 21:13 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-22 21:17 [PATCH net-next v2 0/4] cgroup: bpf: cgroup2 membership test on skb Martin KaFai Lau
2016-06-22 21:17 ` [PATCH net-next v2 1/4] cgroup: Add cgroup_get_from_fd Martin KaFai Lau
2016-06-23 21:11 ` Tejun Heo
[not found] ` <1466630252-3822277-1-git-send-email-kafai-b10kYP2dOMg@public.gmane.org>
2016-06-22 21:17 ` [PATCH net-next v2 2/4] cgroup: bpf: Add BPF_MAP_TYPE_CGROUP_ARRAY Martin KaFai Lau
[not found] ` <1466630252-3822277-3-git-send-email-kafai-b10kYP2dOMg@public.gmane.org>
2016-06-23 9:42 ` Daniel Borkmann
[not found] ` <576BAF07.4020302-FeC+5ew28dpmcu3hnIyYJQ@public.gmane.org>
2016-06-23 21:13 ` Tejun Heo [this message]
[not found] ` <20160623211326.GK3262-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2016-06-23 21:33 ` Daniel Borkmann
2016-06-23 21:26 ` Martin KaFai Lau
2016-06-23 21:50 ` Daniel Borkmann
2016-06-23 22:10 ` Martin KaFai Lau
2016-06-22 21:17 ` [PATCH net-next v2 3/4] cgroup: bpf: Add bpf_skb_in_cgroup_proto Martin KaFai Lau
[not found] ` <1466630252-3822277-4-git-send-email-kafai-b10kYP2dOMg@public.gmane.org>
2016-06-23 9:53 ` Daniel Borkmann
[not found] ` <576BB1AE.5080605-FeC+5ew28dpmcu3hnIyYJQ@public.gmane.org>
2016-06-23 16:54 ` Martin KaFai Lau
[not found] ` <20160623165449.GC82305-ik1955jzaFFGY1KPJGhogQ@public.gmane.org>
2016-06-23 20:07 ` Daniel Borkmann
2016-06-23 21:41 ` Martin KaFai Lau
2016-06-29 14:36 ` kbuild test robot
2016-06-22 21:17 ` [PATCH net-next v2 4/4] cgroup: bpf: Add an example to do cgroup checking in BPF Martin KaFai Lau
[not found] ` <1466630252-3822277-5-git-send-email-kafai-b10kYP2dOMg@public.gmane.org>
2016-06-23 9:58 ` Daniel Borkmann
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