linux-kernel - Re: [PATCH bpf v2 1/2] fprobe: samples: Add use

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Message-Id: <20220622104108.3a1cf1ac050eccba0ee2ef6b@kernel.org>
Date:   Wed, 22 Jun 2022 10:41:08 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH bpf v2 1/2] fprobe: samples: Add use_trace option and
 show hit/missed counter

On Fri, 17 Jun 2022 12:06:51 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Wed,  8 Jun 2022 01:11:02 +0900
> "Masami Hiramatsu (Google)" <mhiramat@...nel.org> wrote:
> 
> >  
> >  static void sample_entry_handler(struct fprobe *fp, unsigned long ip, struct pt_regs *regs)
> >  {
> > -	pr_info("Enter <%pS> ip = 0x%p\n", (void *)ip, (void *)ip);
> > +	if (use_trace)
> > +		trace_printk("Enter <%pS> ip = 0x%p\n", (void *)ip, (void *)ip);
> 
> Could we add a comment stating something like "this is just an example, no
> kernel code should call trace_printk() except when actively debugging".

Indeed. I also add a description for this option so that user can
understand this is just a debug option.

Thank you,


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>