linux-kernel - Re: [PATCH net-next v2 2/4] cgroup: bpf: Add BPF_MAP_TYPE_CGROUP

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Message-ID: <20160623221015.GA93293@kafai-mba.DHCP.thefacebook.com>
Date:	Thu, 23 Jun 2016 15:10:15 -0700
From:	Martin KaFai Lau <kafai@...com>
To:	Daniel Borkmann <daniel@...earbox.net>
CC:	<cgroups@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<netdev@...r.kernel.org>, Alexei Starovoitov <ast@...com>,
	Tejun Heo <tj@...nel.org>, <kernel-team@...com>
Subject: Re: [PATCH net-next v2 2/4] cgroup: bpf: Add
 BPF_MAP_TYPE_CGROUP_ARRAY

On Thu, Jun 23, 2016 at 11:50:08PM +0200, Daniel Borkmann wrote:
> On 06/23/2016 11:26 PM, Martin KaFai Lau wrote:
> >We are still hatching out how to set this up in production. However, the
> >situation is similar to removing the pinned file.
s/pinned file/pinned cgroup-array/

> I presume you mean removing the last BPF program holding a reference on
> the cgroup array map.
Yes

> (Any user space visibility like struct files given
> from the anon inode and pinnings are tracked via uref, btw, which is
> needed to break possible complex dependencies among tail called programs.)
Yep. Understood on prog_array use case.

Thanks,
-- Martin