Date: Mon, 9 May 2005 16:02:58 +0200
From: Ingo Molnar <mingo@elte.hu>
To: kus Kusche Klaus <kus@keba.com>
Cc: linux-kernel@vger.kernel.org, dwalker@mvista.com
Subject: Re: Real-Time Preemption: Magic Sysrq p doesn't work
Message-ID: <20050509140257.GA4714@elte.hu>
References: <AAD6DA242BC63C488511C611BD51F367323204@MAILIT.keba.co.at>
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* kus Kusche Klaus <kus@keba.com> wrote:

> I've been asked to analyze the various tools and possibilities 
> available to debug an RT kernel.
> 
> Up to now, what I've found is not too impressive:
> * Plain GDB can be used to display the current value of kernel variables
> symbolically, but no more: It won't tell anything about the kernel's
> current activity.
> * kgdb and kdb seem to be deeply incompatible with the RT patches (they
> mess with the scheduler, interrupts etc.), applying their patches to an
> RT tree fails quite impressively.

kgdb is in the -mm tree, and there are periodic ports to the -mm tree. 
Someone used it too on PREEMPT_RT - with some success. There's no deep 
incompatibility with the -RT kernel - just line-for-line collisions.

	Ingo
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