linux-kernel - Re: [RFC] [PATCH] In-kernel gdbstub based on utrace Infrastructure.

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Date:	Tue, 1 Dec 2009 17:11:32 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Frank Ch. Eigler" <fche@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org,
	utrace-devel <utrace-devel@...hat.com>,
	Roland McGrath <roland@...hat.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>
Subject: Re: [RFC] [PATCH] In-kernel gdbstub based on utrace Infrastructure.

* Frank Ch. Eigler <fche@...hat.com> wrote:

> On Mon, Nov 30, 2009 at 04:16:50PM +0100, Ingo Molnar wrote:
> > [...]
> > kgdb exists here and today in the kernel and you cannot just build a 
> > facility that doesnt replace it and doesnt integrate well with it.
> 
> Surely you don't mean that: every non-kgdb facility in the kernel 
> meets that definition, even all debugging-related facilities such as 
> perf and ftrace.

Those facilities are not overlapping with kgdb though so my point doesnt 
apply to them. An in-kernel gdb server sure overlaps/extends kgdb 
though.

Btw., perf does meet that definition: it functionally replaces all 
facilities that it overlaps/extends - such as Oprofile. 'What about 
Oprofile?' was one of the first questions asked when we posted perf. 
'What about kgdb?' is the first question to the in-kernel gdb stub 
submission here, for similar reasons.

	Ingo
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