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

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Message-ID: <4B043467.8000708@am.sony.com>
Date:	Wed, 18 Nov 2009 09:52:39 -0800
From:	Tim Bird <tim.bird@...sony.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Matt Mackall <mpm@...enic.com>, David VomLehn <dvomlehn@...co.com>,
	"dedekind1@...il.com" <dedekind1@...il.com>,
	Marco Stornelli <marco.stornelli@...il.com>,
	Simon Kagstrom <simon.kagstrom@...insight.net>,
	"linux-embedded@...r.kernel.org" <linux-embedded@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"dwm2@...radead.org" <dwm2@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"paul.gortmaker@...driver.com" <paul.gortmaker@...driver.com>
Subject: Re: [PATCH, RFC] panic-note: Annotation from user space for panics

Eric W. Biederman wrote:
> 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.

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

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

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