linux-kernel - Re: [PATCH tracing/kprobes 5/7] tracing/kprobes: Add argument name support

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Date:	Fri, 11 Sep 2009 10:07:59 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Jim Keniston <jkenisto@...ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Christoph Hellwig <hch@...radead.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Jason Baron <jbaron@...hat.com>,
	"K.Prasad" <prasad@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Tom Zanussi <tzanussi@...il.com>
Subject: Re: [PATCH tracing/kprobes 5/7] tracing/kprobes: Add argument name
 support

On Thu, 2009-09-10 at 19:53 -0400, Masami Hiramatsu wrote:

> @@ -870,9 +892,13 @@ print_kprobe_event(struct trace_iterator *iter, int flags)
>  {
>  	struct kprobe_trace_entry *field;
>  	struct trace_seq *s = &iter->seq;
> +	struct trace_event *event;
> +	struct trace_probe *tp;
>  	int i;
>  
>  	field = (struct kprobe_trace_entry *)iter->ent;
> +	event = ftrace_find_event(field->ent.type);
> +	tp = container_of(event, struct trace_probe, event);

Can this function be called the data is in the ring buffer, but the
probe has been unregistered? If so, the result of ftrace_find_event be
NULL?

-- Steve

>  
>  	if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET))
>  		goto partial;
> @@ -881,7 +907,8 @@ print_kprobe_event(struct trace_iterator *iter, int flags)
>  		goto partial;
>  
>  	for (i = 0; i < field->nargs; i++)
> -		if (!trace_seq_printf(s, " 0x%lx", field->args[i]))
> +		if (!trace_seq_printf(s, " %s=%lx",
> +				      tp->args[i].name, field->args[i]))
>  			goto partial;
>  
>  	if (!trace_seq_puts(s, "\n"))


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