netdev - Re: [PATCH bpf-next 1/2] bpftool: introduce cgroup tree command

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Message-ID: <20180706140304.6de698a9@cakuba.netronome.com>
Date:   Fri, 6 Jul 2018 14:03:04 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Roman Gushchin <guro@...com>
Cc:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kernel-team@...com>,
        Quentin Monnet <quentin.monnet@...ronome.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        David Ahern <dsahern@...il.com>
Subject: Re: [PATCH bpf-next 1/2] bpftool: introduce cgroup tree command

On Fri, 6 Jul 2018 11:25:45 -0700, Roman Gushchin wrote:
> > Looks very useful!  Minor nits/questions below.  I think the reverse
> > mapping could also be interesting - similar to how -f flag shows where
> > program is pinned, we could add a flag which in 
> > 
> > # bpftool prog show/list
> > 
> > adds info about cgroups where the program is attached?  Obviously as a
> > future extension.  
> 
> Well, it would be convenient, but it's not always possible.
> A program can be attached to a dying cgroup (a cgroup which was deleted
> by a user, but still has some associated resources, e.g. pagecache).

Ack, the bpffs and cgroupfs searches are best effort by definition.
Thanks for addressing the other comments!