linux-kernel - Re: [PATCH bpf-next v4 2/2] bpf: Add show_fdinfo for kprobe

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Message-ID: <9eedd830-9222-4ac0-8ccd-72499fb85b13@linux.dev>
Date: Fri, 20 Jun 2025 10:45:58 +0800
From: Tao Chen <chen.dylane@...ux.dev>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc: Alexei Starovoitov <ast@...nel.org>,
 Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>,
 Martin KaFai Lau <martin.lau@...ux.dev>, Eduard <eddyz87@...il.com>,
 Song Liu <song@...nel.org>, Yonghong Song <yonghong.song@...ux.dev>,
 John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>,
 Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>,
 Jiri Olsa <jolsa@...nel.org>, Matt Bobrowski <mattbobrowski@...gle.com>,
 Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu
 <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 bpf <bpf@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
 linux-trace-kernel <linux-trace-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf-next v4 2/2] bpf: Add show_fdinfo for kprobe_multi

在 2025/6/20 01:17, Alexei Starovoitov 写道:
> On Wed, Jun 18, 2025 at 8:44 PM Tao Chen <chen.dylane@...ux.dev> wrote:
>>
>> Show kprobe_multi link info with fdinfo, the info as follows:
>>
>> link_type:      kprobe_multi
>> link_id:        1
>> prog_tag:       a15b7646cb7f3322
>> prog_id:        21
>> type:   kprobe_multi
> 
> ..
> 
>> +       seq_printf(seq,
>> +                  "type:\t%s\n"
>> +                  "kprobe_cnt:\t%u\n"
>> +                  "missed:\t%lu\n",
>> +                  kmulti_link->flags == BPF_F_KPROBE_MULTI_RETURN ? "kretprobe_multi" :
>> +                                        "kprobe_multi",
> 
> why print the same info twice ?
> seq_printf(m, "link_type:\t%s\n", bpf_link_type_strs[type]);
> in bpf_link_show_fdinfo() already did it in a cleaner way.
> 

link_type only shows 'kprobe_multi', maybe we can show the format like:
// for kretprobe_multi
retprobe: true

// for kprobe_multi
retprobe: false

> Same issue in the other patch.
> 
> pw-bot: cr


-- 
Best Regards
Tao Chen