linux-kernel - Re: [PATCH 2.6.27-rc1-git5 2/26] mdb: correct kprobes int3 trap

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Date:	Wed, 6 Aug 2008 13:03:01 -0600 (MDT)
From:	jmerkey@...fmountaingroup.com
To:	"Masami Hiramatsu" <mhiramat@...hat.com>
Cc:	jmerkey@...fmountaingroup.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.27-rc1-git5 2/26] mdb: correct kprobes int3 trap

> jmerkey@...fmountaingroup.com wrote:
>>> Hi Jeffery,
>>>
>>> Could you explain what is MDB and how it works?
>>
>>
>> MDB is a kernel debugger that uses the same general architecture
>> as the kernel debugger in Netware.  Unlike the variants of GNU
>> debuggers, MDB is geared towards folks from the intel/microsoft worlds
>> who are more accustomed to the old school Intel assembler model and
>> not the GNU variant that looks like an angry typewriter cursing at
>> the screen (%#*&!, etc.).
>
> Would you have any document about MDB, or project-site url?
> I think it is hard for anyone to understand what you like to
> do only from these big patchset.

If you install the patch and enter the debugger, you will find quite
excellent documentation **inside** the debugger.  start with "help help"
at the debugger console.

>
>> MDB has some features not yet in this first patch, but I will be adding
>> to
>> subsequent patches like the ability to create time based traces of
>> execution of code just like an ice does so you can set trigger
>> breakpoints
>> (kdb does not, nor kgdb), then go back ad look what happened in windows
>> of
>> time, as well as a much easier interface, smaller size, more flexible
>> and
>> pluggable command architecture -- a best of all -- it works and does not
>> crash every other release or on every third vendors PC architecture like
>> kdb does all the time.
>
> Would you have talked with kdb/kgdb people?
> Since linux kernel already have kgdb, I think you might better talk
> about merging your functionality (and stability) to kgdb, or at least
> talk about what part both debugger can share.
>
>> It has been in use by me since 1997, when I wrote it after I left
>> Novell.
>> It is mature, hardened, and very stable -- and follows an architecture
>> prove in the industry for over 20 years on Netware.
>
> Out of curiously, is there anyone except for you using MDB?
>
> Thank you,


Network General (now NetScout)
Several Others I do not have authority to name because of NDA agreements.

Jeff




>
>>> And please check your patch style by using scripts/checkpatch.pl.
>>> Your cording style seem to be different from linux coding style...
>>>
>>> Thank you,
>>
>
>
> --
> Masami Hiramatsu
>
> Software Engineer
> Hitachi Computer Products (America) Inc.
> Software Solutions Division
>
> e-mail: mhiramat@...hat.com
>
>


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