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bpf: Add missed value to kprobe perf link info

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Add missed value to kprobe attached through perf link info to
hold the stats of missed kprobe handler execution.

The kprobe's missed counter gets incremented when kprobe handler
is not executed due to another kprobe running on the same cpu.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230920213145.1941596-4-jolsa@kernel.org
This commit is contained in:
Jiri Olsa
2023-09-20 23:31:39 +02:00
committed by Andrii Nakryiko
parent e2b2cd592a
commit 3acf8ace68
6 changed files with 28 additions and 13 deletions
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tools/include/uapi/linux/bpf.h
+1
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@@ -6548,6 +6548,7 @@ struct bpf_link_info {
__u32 name_len;
__u32 offset; /* offset from func_name */
__u64 addr;
__u64 missed;
} kprobe; /* BPF_PERF_EVENT_KPROBE, BPF_PERF_EVENT_KRETPROBE */
struct {
__aligned_u64 tp_name; /* in/out */