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

From: çè
Date: Thu May 28 2020 - 04:14:50 EST

Hi, Andrii

Thanks for your comments :-)

On 2020/5/28 äå2:36, Andrii Nakryiko wrote:
>> ---
> I haven't looked through implementation thoroughly yet. But I have few
> general remarks.
> This looks like a useful and generic tool. I think it will get most
> attention and be most useful if it will be part of BCC tools. There is
> already a set of generic tools that use libbpf and CO-RE, see [0]. It
> feels like this belongs there.
> Some of the annoying parts (e.g., syscall name translation) is already
> generalized as part of syscount tool PR (to be hopefully merged soon),
> so you'll be able to save quite a lot of code with this. There is also
> a common build infra that takes care of things like vmlinux.h, which
> would provide definitions for all those xxx_args structs that you had
> to manually define.
> 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

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

> 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]

Will check the example there :-)

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
> [...]