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

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Date:	Wed, 18 Nov 2009 08:07:21 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Matt Mackall <mpm@...enic.com>
Cc:	David VomLehn <dvomlehn@...co.com>, dedekind1@...il.com,
	Marco Stornelli <marco.stornelli@...il.com>,
	Simon Kagstrom <simon.kagstrom@...insight.net>,
	linux-embedded@...r.kernel.org, akpm@...ux-foundation.org,
	dwm2@...radead.org, linux-kernel@...r.kernel.org,
	paul.gortmaker@...driver.com
Subject: Re: [PATCH, RFC] panic-note: Annotation from user space for panics

Matt Mackall <mpm@...enic.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.

Eric
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