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bpf: Add missed value to kprobe_multi link info

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Add missed value to kprobe_multi link info to hold the stats of missed
kprobe_multi probe.

The missed counter gets incremented when fprobe fails the recursion
check or there's no rethook available for return probe. In either
case the attached bpf program is not executed.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Tested-by: Song Liu <song@kernel.org>
Reviewed-by: Song Liu <song@kernel.org>
Acked-by: Hou Tao <houtao1@huawei.com>
Link: https://lore.kernel.org/bpf/20230920213145.1941596-3-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2023-09-20 23:31:38 +02:00 • committed by Andrii Nakryiko
parent f915fcb385
commit e2b2cd592a
3 changed files with 3 additions and 0 deletions
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1
kernel/trace/bpf_trace.c
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@ -2614,6 +2614,7 @@ static int bpf_kprobe_multi_link_fill_link_info(const struct bpf_link *link,
kmulti_link = container_of(link, struct bpf_kprobe_multi_link, link);
info->kprobe_multi.count = kmulti_link->cnt;
info->kprobe_multi.flags = kmulti_link->flags;
info->kprobe_multi.missed = kmulti_link->fp.nmissed;
if (!uaddrs)
return 0;