linux-kernel - Re: [PATCH tracing/kprobes v3 4/7] tracing/kprobes: Avoid field name confliction

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Message-ID: <20091012194852.GB4748@nowhere>
Date:	Mon, 12 Oct 2009 21:48:54 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...e.hu>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Hellwig <hch@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	"Frank Ch. Eigler" <fche@...hat.com>
Subject: Re: [PATCH tracing/kprobes v3 4/7] tracing/kprobes: Avoid field
	name confliction

On Mon, Oct 12, 2009 at 03:13:51PM -0400, Masami Hiramatsu wrote:
> Frederic Weisbecker wrote:
>> The conflict issue might not be obvious for a user desperately trying to set
>> a kprobe. Even for other failcases, it might not be obvious (blacklisted
>> symbols, syntax errors...)
>>
>> May be should you improve the error granularity and print a KERN_DEBUG
>> message?
>
> Agreed, and kprobes error handling should be improved too (in the most cases,
> it just returns -EINVAL).
>
> Thank you.
>


And btw, I'm enable to create a probe, neither through ftrace nor perf:

	$ sudo ./perf probe -P 'p:sys_close sys_close $retval'
	Adding new event: p:sys_close sys_close+0 $retval

	Error: Failed to create event: Invalid argument


	# echo 'p:sys_open sys_open $retval' > /debug/tracing/kprobe_events 
	bash: echo: write error : Invalid argument

I suspect I missed something very obvious with the syntax :)

I've applied your patches in:

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing.git
	tracing/kprobes

Thanks.



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