* Re: [PATCHv10 2.6.35-rc6-tip 9/14] trace: uprobes trace_event interface
[not found] ` <20100802080032.GA12078@infradead.org>
@ 2010-08-02 9:29 ` Masami Hiramatsu
0 siblings, 0 replies; only message in thread
From: Masami Hiramatsu @ 2010-08-02 9:29 UTC (permalink / raw)
To: Christoph Hellwig
Cc: Ingo Molnar, Frederic Weisbecker, Srikar Dronamraju,
Peter Zijlstra, Steven Rostedt, Randy Dunlap,
Arnaldo Carvalho de Melo, Linus Torvalds, Oleg Nesterov,
Mark Wielaard, Mathieu Desnoyers, Andrew Morton, Naren A Devaiah,
Jim Keniston, Frank Ch. Eigler, Ananth N Mavinakayanahalli, LKML,
Paul E. McKenney, 2nddept-manager, SystemTAP
Christoph Hellwig wrote:
> On Mon, Aug 02, 2010 at 09:56:37AM +0200, Ingo Molnar wrote:
>>>> Hmm, I disagree with it, because both Kprobes and Uprobes provides
>>>> APIs for modules too.
>>> I'm not sure there is a point in maintaining a leightweight version for out
>>> of tree code. These modules could just select kprobes/uprobes events as
>>> well.
>>>
>>> As you prefer, that was just a suggestion to make it more simple.
>> The upstream policy always was that out of tree code does not exist as far as
>> the kernel is concerned. So it is wrong to make the kernel crappier while
>> helping out of tree code.
>
> Indeed. In addition to that the current version of uprobes does not
> actually have any exported symbols.
Ah, indeed. :-(
And then, it conflicts with the description about uprobes in
Documentation/uprobes.txt:
> +Uprobes-based instrumentation can be packaged as a kernel
> +module. In the simplest case, the module's init function installs
> +("registers") one or more probes, and the exit function unregisters
> +them.
So, that could be a bug.
Anyway, at least kprobes has some sample modules under samples/kprobes/.
Aren't they in-tree consumers of kprobes?
Thank you,
--
Masami HIRAMATSU
2nd Research Dept.
Hitachi, Ltd., Systems Development Laboratory
E-mail: masami.hiramatsu.pt@hitachi.com
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2010-08-02 9:29 ` [PATCHv10 2.6.35-rc6-tip 9/14] trace: uprobes trace_event interface Masami Hiramatsu
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