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| author | Andrii Nakryiko <andrii@kernel.org> | 2023-09-26 02:37:45 +0300 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2023-09-26 02:37:53 +0300 |
| commit | 0e73ef1d8c09a1f21ca2b19684819dbbcdce00f9 (patch) | |
| tree | c693b65caa5a8a700c04677fcce5e8db95a7a706 /tools/include/uapi/linux | |
| parent | e0fa6523e02ab31a27daf52e58a0d95fd52d5300 (diff) | |
| parent | 85981e0f9e9fc882578f0ad7488d6c59193dd187 (diff) | |
| download | linux-0e73ef1d8c09a1f21ca2b19684819dbbcdce00f9.tar.xz | |
Merge branch 'bpf: Add missed stats for kprobes'
Jiri Olsa says:
====================
hi,
at the moment we can't retrieve the number of missed kprobe
executions and subsequent execution of BPF programs.
This patchset adds:
- counting of missed execution on attach layer for:
. kprobes attached through perf link (kprobe/ftrace)
. kprobes attached through kprobe.multi link (fprobe)
- counting of recursion_misses for BPF kprobe programs
It's still technically possible to create kprobe without perf link (using
SET_BPF perf ioctl) in which case we don't have a way to retrieve the kprobe's
'missed' count. However both libbpf and cilium/ebpf libraries use perf link
if it's available, and for old kernels without perf link support we can use
BPF program to retrieve the kprobe missed count.
v3 changes:
- added acks [Song]
- make test_missed not serial [Andrii]
Also available at:
https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
bpf/missed_stats
thanks,
jirka
====================
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Diffstat (limited to 'tools/include/uapi/linux')
| -rw-r--r-- | tools/include/uapi/linux/bpf.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 5f13db15a3c7..70bfa997e896 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -6532,6 +6532,7 @@ struct bpf_link_info { __aligned_u64 addrs; __u32 count; /* in/out: kprobe_multi function count */ __u32 flags; + __u64 missed; } kprobe_multi; struct { __u32 type; /* enum bpf_perf_event_type */ @@ -6547,6 +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 */ |