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* [PATCH] ftrace/kprobe: Show the maxactive number on kprobe_events
@ 2020-03-24  7:34 Masami Hiramatsu
  0 siblings, 0 replies; only message in thread
From: Masami Hiramatsu @ 2020-03-24  7:34 UTC (permalink / raw)
  To: Steven Rostedt
  Cc: Masami Hiramatsu, linux-kernel, Taeung Song, linux-trace-users,
	David S . Miller, Alban Crequy

Show maxactive parameter on kprobe_events.
This allows user to save the current configuration and
restore it without losing maxactive parameter.

Reported-by: Taeung Song <>
Signed-off-by: Masami Hiramatsu <>
 kernel/trace/trace_kprobe.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 362cca52f5de..d0568af4a0ef 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1078,6 +1078,8 @@ static int trace_kprobe_show(struct seq_file *m, struct dyn_event *ev)
 	int i;
 	seq_putc(m, trace_kprobe_is_return(tk) ? 'r' : 'p');
+	if (trace_kprobe_is_return(tk) && tk->rp.maxactive)
+		seq_printf(m, "%d", tk->rp.maxactive);
 	seq_printf(m, ":%s/%s", trace_probe_group_name(&tk->tp),

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2020-03-24  7:34 [PATCH] ftrace/kprobe: Show the maxactive number on kprobe_events Masami Hiramatsu

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