linux-kernel - Re: [PATCH v3 bpf-next 1/3] bpftool: introduce cgroup tree command

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Date:   Sat, 7 Jul 2018 01:40:47 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Roman Gushchin <guro@...com>, netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Quentin Monnet <quentin.monnet@...ronome.com>,
        Alexei Starovoitov <ast@...nel.org>
Subject: Re: [PATCH v3 bpf-next 1/3] bpftool: introduce cgroup tree command

On 07/06/2018 11:28 PM, Roman Gushchin wrote:
> This commit introduces a new bpftool command: cgroup tree.
> The idea is to iterate over the whole cgroup tree and print
> all attached programs.
> 
> I was debugging a bpf/systemd issue, and found, that there is
> no simple way to listen all bpf programs attached to cgroups.
> I did master something in bash, but after some time got tired of it,
> and decided, that adding a dedicated bpftool command could be
> a better idea.
> 
> So, here it is:
>   $ sudo ./bpftool cgroup tree
>   CgroupPath
>   ID       AttachType      AttachFlags     Name
>   /sys/fs/cgroup/system.slice/systemd-machined.service
>       18       ingress
>       17       egress
>   /sys/fs/cgroup/system.slice/systemd-logind.service
>       20       ingress
>       19       egress
>   /sys/fs/cgroup/system.slice/systemd-udevd.service
>       16       ingress
>       15       egress
>   /sys/fs/cgroup/system.slice/systemd-journald.service
>       14       ingress
>       13       egress
> 
> Signed-off-by: Roman Gushchin <guro@...com>
> Acked-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
> Cc: Quentin Monnet <quentin.monnet@...ronome.com>
> Cc: Daniel Borkmann <daniel@...earbox.net>
> Cc: Alexei Starovoitov <ast@...nel.org>

Very useful! Applied to bpf-next, thanks everyone!