linux-kernel - Re: [PATCH v6 0/2] tracing: Add an option to show symbols in

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Message-Id: <20251031102947.c2cc7f437db1399c7ebc1863@kernel.org>
Date: Fri, 31 Oct 2025 10:29:47 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Mark Rutland <mark.rutland@....com>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH v6 0/2] tracing: Add an option to show symbols in
 _text+offset for function profiler

On Thu, 30 Oct 2025 05:25:48 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Thu, 30 Oct 2025 12:30:05 +0900
> "Masami Hiramatsu (Google)" <mhiramat@...nel.org> wrote:
> 
> >  kernel/trace/blktrace.c              |    6 +
> >  kernel/trace/ftrace.c                |   26 ++++++
> >  kernel/trace/trace.c                 |  154 +++++++++++++++++-----------------
> >  kernel/trace/trace.h                 |   40 +++++----
> >  kernel/trace/trace_events.c          |    4 -
> >  kernel/trace/trace_events_synth.c    |    2 
> >  kernel/trace/trace_fprobe.c          |    6 +
> >  kernel/trace/trace_functions_graph.c |   18 ++--
> >  kernel/trace/trace_irqsoff.c         |   30 +++----
> >  kernel/trace/trace_kdb.c             |    2 
> >  kernel/trace/trace_kprobe.c          |    6 +
> >  kernel/trace/trace_output.c          |   18 ++--
> >  kernel/trace/trace_sched_wakeup.c    |   24 +++--
> >  kernel/trace/trace_syscalls.c        |    4 -
> >  kernel/trace/trace_wprobe.c          |    2 
> 
> I didn't realize this affected your branch too. Which means I can't apply
> this to any branch.

Ah, I rebased it on the linux-trace/for-next, the auto merged branch.
Let me rebase it on trace/for-next.

> 
> Also, could you make a helper function...
> 
> +++ b/kernel/trace/trace_wprobe.c
> @@ -260,7 +260,7 @@ print_wprobe_event(struct trace_iterator *iter, int flags,
>  
>         trace_seq_printf(s, "%s: (", trace_probe_name(tp));
>  
> -       if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET))
> +       if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER(SYM_OFFSET)))
>                 goto out;
>  
>         trace_seq_putc(s, ')');
> 
> that both fprobe and wprobe use? And then you don't need to have this open
> coded everywhere.

Yeah, OK.

> 
> That is, add this patch:
> 
> diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
> index 591adc9bb1e9..bd26004cc320 100644
> --- a/kernel/trace/trace_probe.h
> +++ b/kernel/trace/trace_probe.h
> @@ -598,3 +598,9 @@ struct uprobe_dispatch_data {
>  	struct trace_uprobe	*tu;
>  	unsigned long		bp_addr;
>  };
> +
> +static inline int probe_print_ip_sym(struct trace_seq *s, unsigned long ip,
> +				     int flags)
> +{
> +	retun seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET);
> +}
> 
> And use that instead.

Shouldn't we make it trace-wide function ? 

> 
> So, new plan. Base this patch on top of v6.18-rc3 and send that.
> 

OK.

> Then what we can do is merge this branch into your branch and my branch and
> add on top of it.
> 
> Note, you should have rebased your probe branch on top of one of the
> v6.18-rc releases. It's still based on top of 6.17-rc6, which can cause
> other issues.

OK.

Thank you,

> 
> 
> -- Steve


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