linux-kernel - [RFC PATCH -tip 1/2] trace: kprobes: Show sum of probe/retprobe nmissed count

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Message-Id: <150333006163.7343.4285813039620422255.stgit@devbox>
Date:   Tue, 22 Aug 2017 00:41:11 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...nel.org>
Cc:     Frederic Weisbecker <fweisbec@...il.com>, systemtap@...rceware.org,
        linux-kernel@...r.kernel.org,
        Alban Crequy <alban.crequy@...il.com>,
        Alban Crequy <alban@...volk.io>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        "David S . Miller" <davem@...emloft.net>
Subject: [RFC PATCH -tip 1/2] trace: kprobes: Show sum of probe/retprobe nmissed count

Show sum of probe and retprobe nmissed count in
kprobe_profile, since retprobe can be missed even
if the kprobe itself succeeeded.
This explains user why their return probe didn't hit
sometimes.

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Tested-by: Alban Crequy <alban@...volk.io>
---
 kernel/trace/trace_kprobe.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index c9b5aa10fbf9..fe1bd541216c 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -928,7 +928,7 @@ static int probes_profile_seq_show(struct seq_file *m, void *v)
 	seq_printf(m, "  %-44s %15lu %15lu\n",
 		   trace_event_name(&tk->tp.call),
 		   trace_kprobe_nhit(tk),
-		   tk->rp.kp.nmissed);
+		   tk->rp.kp.nmissed + tk->rp.nmissed);
 
 	return 0;
 }