[PATCH 1/2] trace/kprobe: Fix count of missed kretprobes in kprobe_profile

Naveen N. Rao
2021-06-14T18:04:49Z

For a kretprobe, the miss count includes the number of times the probe
on function entry was missed, as well as the number of times we ran out
of kretprobe_instance structures due to maxactive being too low.

Fixes: cd7e7bd5e44718 ("tracing: Add kprobes event profiling interface")
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
---
kernel/trace/trace_kprobe.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index ea6178cb5e334d..0475e2a6d0825e 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1192,7 +1192,8 @@ static int probes_profile_seq_show(struct seq_file *m, void *v)
seq_printf(m, " %-44s %15lu %15lu\n",
trace_probe_name(&tk->tp),
trace_kprobe_nhit(tk),
- tk->rp.kp.nmissed);
+ trace_kprobe_is_return(tk) ? tk->rp.kp.nmissed + tk->rp.nmissed
+ : tk->rp.kp.nmissed);

return 0;
}
--
2.31.1