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0e73ef1d8c
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>
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Linux kernel
============
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