linux-kernel - Re: [PATCH bpf-next] cgroup: support attaching eBPF programs to net

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Date:   Thu, 25 Jan 2018 23:56:18 +0800
From:   Yafang Shao <laoar.shao@...il.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     Roman Gushchin <guro@...com>, David Miller <davem@...emloft.net>,
        longman@...hat.com, lizefan@...wei.com,
        Johannes Weiner <hannes@...xchg.org>,
        Cgroups <cgroups@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf-next] cgroup: support attaching eBPF programs to
 net_prio cgroup

On Thu, Jan 25, 2018 at 11:50 PM, Tejun Heo <tj@...nel.org> wrote:
> On Thu, Jan 25, 2018 at 11:38:48PM +0800, Yafang Shao wrote:
>> If net_prio is used, we could also use eBPF programs to attach it,
>> because the net_prio cgroup could be got with prioidx in struct
>> sock_cgroup_data.
>> Hence it should not only be limited to cgroup2.
>
> I really don't wanna do this.  This comes with all sorts of reverse
> lookup and naming issues.  In addition, cgroup1 and 2 aren't mutually
> exclusive.  If the use case is on cgroup1 and wants to use cgroup bpf
> programs, just replicate the cgroup2 hierarchy for bpf.  Hierarchy
> replication across different controllers is how most use cgroup1 after
> all.  With recent versions of systemd which defaults to using cgroup2
> for process management, you get the replication for free too.
>

Hi Tejun,

I don't understand what do you mean Hierarchy replication.
Could you pls. show me some examples  ?


Thanks
Yafang