linux-kernel - Re: [PATCH -next] Documentation: Improve crashkernel= description

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Message-ID: <20110206215733.GB26233@verge.net.au>
Date:	Mon, 7 Feb 2011 06:57:33 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	"Ahmed S. Darwish" <darwish.07@...il.com>
Cc:	Randy Dunlap <rdunlap@...otime.net>,
	Vivek Goyal <vgoyal@...hat.com>,
	Haren Myneni <hbabu@...ibm.com>,
	Eric Biederman <ebiederm@...ssion.com>,
	kexec@...ts.infradead.org, LKML <linux-kernel@...r.kernel.org>,
	linux-doc@...r.kernel.org
Subject: Re: [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@...il.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 '@...set' part was ignored, Linux finds
> +			a suitable crash image start address automatically.

I think this would be further improved as:

			... If '@...set' 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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