On Mon, Jun 16, 2025 at 6:03 AM Tao Chen <chen.dylane@xxxxxxxxx> 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
> kprobe_cnt: 8
> missed: 0
> cookie func
> 1 bpf_fentry_test1
> 7 bpf_fentry_test2
> 2 bpf_fentry_test3
> 3 bpf_fentry_test4
> 4 bpf_fentry_test5
> 5 bpf_fentry_test6
> 6 bpf_fentry_test7
> 8 bpf_fentry_test8
>
> Signed-off-by: Tao Chen <chen.dylane@xxxxxxxxx>
> ---
> kernel/trace/bpf_trace.c | 32 ++++++++++++++++++++++++++++++++
> 1 file changed, 32 insertions(+)
>
> diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
> index 2d422f897ac..fcf19e233b5 100644
> --- a/kernel/trace/bpf_trace.c
> +++ b/kernel/trace/bpf_trace.c
> @@ -2623,10 +2623,42 @@ static int bpf_kprobe_multi_link_fill_link_info(const struct bpf_link *link,
> return err;
> }
>
> +#ifdef CONFIG_PROC_FS
> +static void bpf_kprobe_multi_show_fdinfo(const struct bpf_link *link,
> + struct seq_file *seq)
> +{
> + struct bpf_kprobe_multi_link *kmulti_link;
> + char sym[KSYM_NAME_LEN];
> +
> + kmulti_link = container_of(link, struct bpf_kprobe_multi_link, link);
> +
> + 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",
> + kmulti_link->cnt,
> + kmulti_link->fp.nmissed);
> +
> + seq_printf(seq, "%-16s %-16s\n", "cookie", "func");
> + for (int i = 0; i < kmulti_link->cnt; i++) {
> + sprint_symbol_no_offset(sym, kmulti_link->addrs[i]);
> + seq_printf(seq,
> + "%-16llu %-16s\n",
> + kmulti_link->cookies[i],
> + sym);
Why call sprint_symbol_no_offset() directly ?
%pB is fine.
+off doesn't disclose anything.
pw-bot: cr
