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

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Date:	Wed, 06 Apr 2011 10:19:19 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Hui Zhu <teawater@...il.com>
Cc:	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>,
	Jason Wessel <jason.wessel@...driver.com>
Subject: Re: KGTP (Linux Kernel debugger and tracer) 20110405 release

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?
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