netdev - Re: [RFC PATCH] samples:bpf: introduce task detector

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Date:   Fri, 29 May 2020 10:24:45 +0800
From:   王贇 <yun.wang@...ux.alibaba.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:BPF (Safe dynamic programs and tools)" 
        <netdev@...r.kernel.org>,
        "open list:BPF (Safe dynamic programs and tools)" 
        <bpf@...r.kernel.org>
Subject: Re: [RFC PATCH] samples:bpf: introduce task detector



On 2020/5/29 上午2:34, Andrii Nakryiko wrote:
[snip]
>>>
>>> With CO-RE, it also will allow to compile this tool once and run it on
>>> many different kernels without recompilation. Please do take a look
>>> and submit a PR there, it will be a good addition to the toolkit (and
>>> will force you write a bit of README explaining use of this tool as
>>> well ;).
>>
>> Aha, I used to think bcc only support python and cpp :-P
>>
> 
> libbpf-tools don't use BCC at all, they are just co-located with BCC
> and BCC tools in the same repository and are lightweight alternatives
> to BCC-based tools. But it needs kernel with BTF built-in, which is
> the only (temporary) downside.

I see, thanks for the explain :-)

We prefer libbpf since we feel it's more friendly for kernel folks to
do develop, less suspects when meet any BUG, while BCC is a good way
to package and distribute, glad to know that we can have them in one
piece now.

Regards,
Michael Wang

> 
>> I'll try to rework it and submit PR, I'm glad to know that you think
>> this tool as a helpful one, we do solved some tough issue with it
>> already.
>>
>>>
>>> As for the code itself, I haven't gone through it much, but please
>>> convert map definition syntax to BTF-defined one. The one you are
>>> using is a legacy one. Thanks!
>>>
>>>   [0] https://github.com/iovisor/bcc/tree/master/libbpf-tools
>>
>> Will check the example there :-)
>>
>> Regards,
>> Michael Wang
>>
>>>
>>>>  samples/bpf/Makefile             |   3 +
>>>>  samples/bpf/task_detector.h      | 382 +++++++++++++++++++++++++++++++++++++++
>>>>  samples/bpf/task_detector_kern.c | 329 +++++++++++++++++++++++++++++++++
>>>>  samples/bpf/task_detector_user.c | 314 ++++++++++++++++++++++++++++++++
>>>>  4 files changed, 1028 insertions(+)
>>>>  create mode 100644 samples/bpf/task_detector.h
>>>>  create mode 100644 samples/bpf/task_detector_kern.c
>>>>  create mode 100644 samples/bpf/task_detector_user.c
>>>>
>>>
>>> [...]
>>>