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SubjectRe: [PATCH] tracing/kprobes: 'nmissed' not showed correctly for kretprobe
Resending again, this time with Masami's working email address.

On Wed, 5 Jan 2022 14:15:56 -0500
Steven Rostedt <rostedt@goodmis.org> wrote:

> On Sat, 11 Dec 2021 23:00:32 +0800
> Xiangyang Zhang <xyz.sun.ok@gmail.com> wrote:
>
> > The 'nmissed' column of the 'kprobe_profile' file for kretprobe is
> > always zero, because 'nmissed' for kretprobe is maintained in
> > 'tk->rp.nmissed' but not in 'tk->rp.kp.nmissed'
> >
> > Fixes: c31ffb3ff633 ("tracing/kprobes: Factor out struct trace_probe")
> > Signed-off-by: Xiangyang Zhang <xyz.sun.ok@gmail.com>
> > ---
> > kernel/trace/trace_kprobe.c | 4 +++-
> > 1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> > index d10c01948e68..2b9de6826e94 100644
> > --- a/kernel/trace/trace_kprobe.c
> > +++ b/kernel/trace/trace_kprobe.c
> > @@ -1175,15 +1175,17 @@ static int probes_profile_seq_show(struct seq_file *m, void *v)
> > {
> > struct dyn_event *ev = v;
> > struct trace_kprobe *tk;
> > + unsigned long nmissed = 0;
>
> No need to initialize this to zero, the first use is an assignment.
>
> >
> > if (!is_trace_kprobe(ev))
> > return 0;
> >
> > tk = to_trace_kprobe(ev);
> > + nmissed = tk->rp.handler ? tk->rp.nmissed : tk->rp.kp.nmissed;
> > seq_printf(m, " %-44s %15lu %15lu\n",
> > trace_probe_name(&tk->tp),
> > trace_kprobe_nhit(tk),
> > - tk->rp.kp.nmissed);
> > + nmissed);
>
> Masami, what's your thoughts on this patch?
>
> -- Steve
>
> >
> > return 0;
> > }
>

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