在 2025/6/19 09:46, Alexei Starovoitov 写道:
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
My problem, sorry for that, i had some issues with using printk to show func name directly before. Actually, i used it incorrectly. How about %pS, it looks more accurate. Thanks!
%pB format cookie func 8 __pfx_bpf_fentry_test1+0x10/0x10 2 __pfx_bpf_fentry_test2+0x10/0x10 7 __pfx_bpf_fentry_test3+0x10/0x10 %pS format cookie func 8 bpf_fentry_test1+0x0/0x20 2 bpf_fentry_test2+0x0/0x20 7 bpf_fentry_test3+0x0/0x20 -- Best Regards Tao Chen
