linux-kernel - Re: [PATCHv10 2.6.35-rc6-tip 9/14] trace: uprobes trace

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Date:	Mon, 02 Aug 2010 12:45:08 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Randy Dunlap <rdunlap@...otime.net>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Mark Wielaard <mjw@...hat.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Naren A Devaiah <naren.devaiah@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	2nddept-manager@....hitachi.co.jp
Subject: Re: [PATCHv10 2.6.35-rc6-tip 9/14]  trace: uprobes trace_event	interface

Frederic Weisbecker wrote:
> On Thu, Jul 29, 2010 at 02:04:14PM +0900, Masami Hiramatsu wrote:
>> Srikar Dronamraju wrote:
>>> diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
>>> index c681fa7..16e2a8c 100644
>>> --- a/kernel/trace/Kconfig
>>> +++ b/kernel/trace/Kconfig
>>> @@ -482,6 +482,22 @@ config RING_BUFFER_BENCHMARK
>>>  
>>>  	  If unsure, say N.
>>>  
>>> +config UPROBE_EVENT
>>> +	bool "Enable uprobes-based dynamic events"
>>> +	depends on ARCH_SUPPORTS_UPROBES
>>> +	depends on MMU
>>> +	select UPROBES
>>> +	select PROBE_EVENTS
>>> +	select TRACING
>>> +	default n
>>> +	help
>>> +	  This allows the user to add tracing events on top of userspace dynamic
>>> +	  events (similar to tracepoints) on the fly via the traceevents interface.
>>> +	  Those events can be inserted wherever uprobes can probe, and record
>>> +	  various registers.
>>> +	  This option is required if you plan to use perf-probe subcommand of perf
>>> +	  tools on user space applications.
>>> +
>> Possible enhancement: Moving this config right after KPROBE_EVENT, because
>>  those two provide similar dynamic events.
>>
>> Thank you,
> 
> 
> In fact this could be a menu "Dynamic Probes", perhaps default off, inside
> which Kprobes and Uprobes would be default on (but depend on "Dynamic Probes").
> 
> So that you can quickly enable them all in one.

Hmm, I disagree with it, because both Kprobes and Uprobes provides
APIs for modules too.

I'd like to suggest below config tree

Kenrel hacking
  - Kprobes
  - Uprobes
  - Tracing
     -- Dynamic Events
        depends on Kprobes || Uprobes
or
	select Kprobes && Uprobes

Thank you,

-- 
Masami HIRAMATSU
2nd Research Dept.
Hitachi, Ltd., Systems Development Laboratory
E-mail: masami.hiramatsu.pt@...achi.com
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