Re: [PATCH, RFC] panic-note: Annotation from user space for panics

Tim Bird
2009-11-18T17:53:01Z

Eric W. Biederman wrote:
> Matt Mackall <mpm@selenic.com> writes:
>
>> As much as I like kexec, it loses on memory footprint by about 100x.
>> It's not appropriate for all use cases, especially things like
>> consumer-grade wireless access points and phones.
>
> In general I agree. The cost of a second kernel and initrd can be
> prohibitive in the smallest systems, and if you do a crash capture
> with using a standalone app that is reinventing the wheel.
>
> That said. I can happily run kdump with only 16M-20M reserved.
> So on many systems the cost is affordable.

Understood. On some of my systems, the memory budget for the
entire system is 10M. On most systems I work with, it is a
struggle to reserve even 64K for this feature.
-- Tim

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Tim Bird
Architecture Group Chair, CE Linux Forum
Senior Staff Engineer, Sony Corporation of America
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