Re: [PATCH v5] x86, kdump: Set crashkernel_low automatically

From: Yinghai Lu
Date: Wed Mar 20 2013 - 11:53:33 EST

On Wed, Mar 20, 2013 at 6:08 AM, Vivek Goyal <vgoyal@xxxxxxxxxx> wrote:

> Have a general question about crashkernel_low. Why does it need to
> show up as "Crash kernel low" in /proc/iomem. Will it not be better
> that all memory reserved for crashkernel (whether high or low), shows
> as "Crash Kernel" and let kexec-tools decide whether to load kernel
> high or low etc.
> IOW, there should not be any need to differentiate between "Crash kernel"
> and "Crash kernel low". There are address ranges associated and looking
> at addresses it is obivious that certain memory is below 4G.

yes. it is doable.
1. will need to add more code to expand parse_iomem_single to handle
multiple "Crash kernel" in kexec-tools.
2. also we already have "crashkernel_low=" in command line, so it is
good to keep them consistent in /proc/iomem.


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