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SubjectRe: [PATCH -next] Documentation: Improve crashkernel= description
On Sun, Feb 06, 2011 at 05:41:08PM +0200, Ahmed S. Darwish wrote:
> (Also applicable over 2.6.38-rc3)
>
> Had to explore two C code files to make sense of the 'crashkernel='
> kernel parameter values. Improve the situation.
>
> Signed-off-by: Ahmed S. Darwish <darwish.07@gmail.com>
> ---
>
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 89835a4..8f26b42 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -545,9 +545,12 @@ and is between 256 and 4096 characters. It is defined in the file
> Format:
> <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>]
>
> - crashkernel=nn[KMG]@ss[KMG]
> - [KNL] Reserve a chunk of physical memory to
> - hold a kernel to switch to with kexec on panic.
> + crashkernel=size[KMG][@offset[KMG]]
> + [KNL] Using kexec, Linux can switch to a 'crash kernel'
> + upon panic. This parameter reserves the physical
> + memory region [offset, offset + size] for that kernel
> + image. If the '@offset' part was ignored, Linux finds
> + a suitable crash image start address automatically.

I think this would be further improved as:

... If '@offset' is omitted then a suitable
offset is selected automatically.

>
> crashkernel=range1:size1[,range2:size2,...][@offset]
> [KNL] Same as above, but depends on the memory
>
> regards,
>
> --
> Darwish
> http://darwish.07.googlepages.com
> --
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