Re: [ANNOUNCE] Merkey's Kernel Debugger

[Cliff Wickman]

On Fri, Aug 08, 2008 at 02:20:52PM +0200, Andi Kleen wrote:
> > In a partitioned system [I work for SGI, so I'm talking about an Altix],
> > there is memory sharing among multiple single-system images. And if
> > one of those partitions were to panic the other partitions need to
> > be informed that they cannot address the panic'd partition's memory.
> > (Once that partition is rebooted any such access will cause an MCA
> > in the accessor.)
> 
> There are already existing shutdown hooks. Aren't they good enough
> for that?

For shutdown, yes.  But on a panic crash_kexec() gets called
before the panic_notifier_list is run.
 
> I would feel uneasy about having arbitary drivers hook into panic().
> While I'm sure your code is great there is unfortunately a lot 
> of crappy driver code around.

That is Eric Biederman's concern as well.  But it seems we should
have a way for a user/customer to customize those events and their order,
as I noted in a previous post.

-- 
Cliff Wickman
Silicon Graphics, Inc.
cpw@xxxxxxx
(651) 683-3824
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