linux-kernel - Re: KGTP (Linux Kernel debugger and tracer) 20110405 release

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Date:	Fri, 8 Apr 2011 15:58:39 +0800
From:	Hui Zhu <teawater@...il.com>
To:	Dongdong Deng <libfetion@...il.com>
Cc:	Jason Wessel <jason.wessel@...driver.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org,
	Marc Khouzam <marc.khouzam@...csson.com>,
	Thiago Jung Bauermann <thiago.bauermann@...il.com>,
	Steven <mqyoung@...il.com>, colyli@...il.com,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: KGTP (Linux Kernel debugger and tracer) 20110405 release

On Fri, Apr 8, 2011 at 14:41, Dongdong Deng <libfetion@...il.com> wrote:
> On Fri, Apr 8, 2011 at 1:36 PM, Hui Zhu <teawater@...il.com> wrote:
>> On Wed, Apr 6, 2011 at 16:19, Peter Zijlstra <peterz@...radead.org> wrote:
>>> On Wed, 2011-04-06 at 13:54 +0800, Hui Zhu wrote:
>>>
>>>> This is a good question.
>>>>
>>>> The KGTP is completely different with KGDB.  It will not supply simple
>>>> gdbrsp debug interface to user.  It just supply  interface between the
>>>> kernel tracepoint(Now, just support kprobe, will add others later) and
>>>> GDB tracepoint function.
>>>>
>>>> So user can debug and trace Linux kernel with GDB without stop the
>>>> Linux Kernel (So the GDB can running on this Kernel).  It is a trace
>>>> tools and debug tools.
>>>
>>> But this isn't really an answer either. Could you extend the existing
>>> KGDB infrastructure to provide these features and thereby re-use
>>> existing infrastructure to reduce your patch size and code duplication?
>>>
>>> Jason (the KGDB maintainer) certainly thought there was much possibility
>>> there when I spoke to him yesterday.
>>>
>>> Think of it this way, wouldn't it be much better if there was one tool
>>> that could provide the combined feature set of KGDB and KGTP?
>>>
>>
>> Thanks Peter.  I think it is very good.
>>
>> Which part do you think kgtp can share with kgdb?
>
>
> The main realizing of "kgtp" was based on the sub protocol
> 'Tracepoint-Packets' of 'gdb Remote Serial Protocol'.
>
> http://sourceware.org/gdb/current/onlinedocs/gdb/Tracepoint-Packets.html#Tracepoint-Packets
>
> and kgdb have realized most of gdb remote serial protocols.
>
>
> thus the protocol 'Tracepoint-Packets' implement of kgtp could share
> with kgdb, and the breakpoint handler could follow kgdb's from kprobe,
>
> the offline gdb operate interface(an kernel inside gdbserver for gdb)
> could realize a module like "kgdbts" module implement
> (linux-2.6/drivers/misc/kgdbts.c).
>
> Thanks,
> Dongdong
>

Cool.  Wish someone can do that.

Thanks,
Hui
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