linux-kernel - Re: Using perf probe with arguments throws a fatal error.

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Message-ID: <20100825065541.GE14431@linux.vnet.ibm.com>
Date:	Wed, 25 Aug 2010 12:25:41 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Fr?d?ric Weisbecker <fweisbec@...il.com>,
	2nddept-manager@....hitachi.co.jp, Ingo Molnar <mingo@...e.hu>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Using perf probe with arguments throws a fatal error.

> > 
> > The differences I see when a name is given we refer the name, while in
> > the previous case we refer the register %ip.
> 
> Ah, I remembered that, yeah, perf doesn't support those raw regsiters,
> dereferences, etc.
> Hmm, this should be solved, but not so simple as just removing "%",
> because there are also special variables ($retval, $stack) and
> dereferences(+8(+10(%sp)), etc).
> 
> I think the simplest solution is just setting "argX" name for each
> argument (if user omitted its name) in kprobe-tracer (because
> trace-cmd will face same problem).
> e.g.
>  # echo "p do_fork %ip" > tracing/kprobe_events
> will be translated as below
>  # echo "p do_fork arg1=%ip" > tracing/kprobe_events
> 

Okay, I will follow the same and fix the argX name in uprobe-tracer.

--
Thanks and Regards
Srikar
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