在 2025/6/13 05:27, Andrii Nakryiko 写道:
On Thu, Jun 12, 2025 at 4:56 AM Tao Chen <chen.dyl...@linux.dev> wrote:Show uprobe_multi link info with fdinfo, the info as follows: link_type: uprobe_multi link_id: 9 prog_tag: e729f789e34a8eca prog_id: 39 type: uprobe_multi func_cnt: 3 pid: 0 path: /home/dylane/bpf/tools/testing/selftests/bpf/test_progs offset: 0xa69ed7 ref_ctr_offset: 0x0 cookie: 3 offset: 0xa69ee2 ref_ctr_offset: 0x0 cookie: 1 offset: 0xa69eed ref_ctr_offset: 0x0 cookie: 2 Signed-off-by: Tao Chen <chen.dyl...@linux.dev> --- kernel/trace/bpf_trace.c | 48 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 24b94870b50..c4ad82b8fd8 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -3157,10 +3157,58 @@ static int bpf_uprobe_multi_link_fill_link_info(const struct bpf_link *link, return err; } +#ifdef CONFIG_PROC_FS +static void bpf_uprobe_multi_show_fdinfo(const struct bpf_link *link, + struct seq_file *seq) +{ + struct bpf_uprobe_multi_link *umulti_link; + char *p, *buf; + + umulti_link = container_of(link, struct bpf_uprobe_multi_link, link); + + buf = kmalloc(PATH_MAX, GFP_KERNEL); + if (!buf) + return; + + p = d_path(&umulti_link->path, buf, PATH_MAX); + if (IS_ERR(p)) { + kfree(buf); + return; + } + + seq_printf(seq, + "type:\t%s\n" + "func_cnt:\t%u\n"it's not really *func* (e.g., for USDTs it's basically guaranteed to be somewhere inside the function, potentially in many places within the same function), I'd use generic "uprobe_{cnt,count}"
will change it in v2, thanks for the advice.
+ "pid:\t%u\n" + "path:\t%s\n", + umulti_link->flags == BPF_F_UPROBE_MULTI_RETURN ? + "uretprobe_multi" : "uprobe_multi", + umulti_link->cnt, + umulti_link->task ? task_pid_nr_ns(umulti_link->task, + task_active_pid_ns(current)) : 0, + p); + + for (int i = 0; i < umulti_link->cnt; i++) { + seq_printf(seq, + "offset:\t%#llx\n" + "ref_ctr_offset:\t%#lx\n" + "cookie:\t%llu\n", + umulti_link->uprobes[i].offset, + umulti_link->uprobes[i].ref_ctr_offset, + umulti_link->uprobes[i].cookie); + } + + kfree(buf); +} +#endif + static const struct bpf_link_ops bpf_uprobe_multi_link_lops = { .release = bpf_uprobe_multi_link_release, .dealloc_deferred = bpf_uprobe_multi_link_dealloc, .fill_link_info = bpf_uprobe_multi_link_fill_link_info, +#ifdef CONFIG_PROC_FS + .show_fdinfo = bpf_uprobe_multi_show_fdinfo, +#endif }; static int uprobe_prog_run(struct bpf_uprobe *uprobe, -- 2.48.1
-- Best Regards Tao Chen
