From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
To: <linux-kernel@vger.kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Steven Rostedt <rostedt@goodmis.org>,
Anton Blanchard <anton@ozlabs.org>
Subject: [PATCH 1/2] trace/kprobe: Fix count of missed kretprobes in kprobe_profile
Date: Mon, 14 Jun 2021 23:33:28 +0530 [thread overview]
Message-ID: <2905f923966229953e6dc162b0a036853a420172.1623693448.git.naveen.n.rao@linux.vnet.ibm.com> (raw)
In-Reply-To: <cover.1623693448.git.naveen.n.rao@linux.vnet.ibm.com>
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
next prev parent reply other threads:[~2021-06-14 18:04 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-14 18:03 [PATCH 0/2] trace/kprobe: Two fixes for kretprobes Naveen N. Rao
2021-06-14 18:03 ` Naveen N. Rao [this message]
2021-06-15 5:47 ` [PATCH 1/2] trace/kprobe: Fix count of missed kretprobes in kprobe_profile Masami Hiramatsu
2021-06-14 18:03 ` [PATCH 2/2] trace/kprobe: Remove limit on kretprobe maxactive Naveen N. Rao
2021-06-15 9:35 ` Masami Hiramatsu
2021-06-15 17:41 ` Naveen N. Rao
2021-06-16 0:46 ` Masami Hiramatsu
2021-06-16 1:03 ` Steven Rostedt
2021-06-16 2:27 ` Masami Hiramatsu
2021-06-16 15:10 ` Masami Hiramatsu
2021-06-17 16:34 ` Naveen N. Rao
2021-06-17 17:07 ` Steven Rostedt
2021-06-18 4:26 ` Masami Hiramatsu
2021-06-18 8:41 ` Naveen N. Rao
2021-06-17 16:19 ` Naveen N. Rao
2021-06-18 6:17 ` Masami Hiramatsu
2021-06-18 13:19 ` Naveen N. Rao
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