Re: [Fastboot] [PATCH] Reserving backup region for kexec based crashdumps.

[Itsuro Oda]

Hi,

I don't like calling crash_kexec() directly in (ex.) panic().
It should be call_dump_hook() (or something like this).

I think the necessary modifications of the kernel is only:
- insert the hooks that calls a dump function when crash occur
- binding interface that binds a dump function to the hook
  (like register_dump_hook())
- supply the information of valid physical address regions
(- maybe some existent functions and variables need to be exported ?)

I think this makes any sort of dump functions can be implemented
as a kernel module. I don't think it is best way that the "kexec based 
crashdump" is built in the kernel.

Thanks.

On 01 Feb 2005 02:06:42 -0700
ebiederm@xxxxxxxxxxxx (Eric W. Biederman) wrote:

> Koichi Suzuki <koichi@xxxxxxxxxxxxxxxxx> writes:
> 
> > Hook in panic code is very good idea and is useful in various scenes. It could
> > be used to kick RAM dump code, obviously, and also kick the code to initiate
> > failover, etc.   Various use could be possible so I believe that this hook
> > should be prepared for wider use.
> 
> It is.  Basically it is the normal kexec interface that allows you to
> boot another kernel.  With a few restrictions that should keep it as
> reliable as possible when the kernel has not shut itself down cleanly.
> 
> The hardest case is to do a useful system core dump.  As that requires
> looking at what has gone before.  For the rest if you can do it
> with a kernel and a initramfs you are in good shape.
> 
> There seems to be a significant amount of interest in the full
> system core dump case so that is what the work is concentrating
> on.
> 
> Eric
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/

-- 
Itsuro ODA <oda@xxxxxxxxxxxxx>

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/