netdev - Re: [PATCH v3 bpf-next 0/4] Add support for cgroup bpf

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Message-ID: <b5526d61-9af9-1f10-bf20-38cf8a2f10fd@gmail.com>
Date:   Tue, 31 Mar 2020 16:44:43 -0600
From:   David Ahern <dsahern@...il.com>
To:     Edward Cree <ecree@...arflare.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Andrii Nakryiko <andriin@...com>, bpf <bpf@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrey Ignatov <rdna@...com>, Kernel Team <kernel-team@...com>
Subject: Re: [PATCH v3 bpf-next 0/4] Add support for cgroup bpf_link

On 3/31/20 3:51 PM, Edward Cree wrote:
> On 31/03/2020 04:54, Andrii Nakryiko wrote:
>> No need to kill random processes, you can kill only those that hold
>> bpf_link FD. You can find them using drgn tool with script like [0].
> For the record, I find the argument "we don't need a query feature,
>  because you can just use a kernel debugger" *utterly* *horrifying*.
> Now, it seems to be moot, because Alexei has given other, better
>  reasons why query doesn't need to land yet; but can we please not
>  ever treat debugging interfaces as a substitute for proper APIs?
> 
> </scream>
> -ed
> 

just about to send the same intent. Dev packages and processing
/proc/kcore is not a proper observability API for production systems.