linux-kernel - Re: [Patch 1/7] x86: add CONFIG_KEXEC_AUTO

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Message-ID: <87zlaeiakr.fsf@basil.nowhere.org>
Date:	Wed, 05 Aug 2009 16:45:08 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Amerigo Wang <amwang@...hat.com>
Cc:	linux-kernel@...r.kernel.org, tony.luck@...el.com,
	linux-ia64@...r.kernel.org, Neil Horman <nhorman@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>,
	Anton Vorontsov <avorontsov@...mvista.com>
Subject: Re: [Patch 1/7] x86: add CONFIG_KEXEC_AUTO_RESERVE

Amerigo Wang <amwang@...hat.com> writes:

> Introduce a new config option KEXEC_AUTO_RESERVE for x86.

The description of the feature belongs in the changelog.

I like the basic idea, but:

> +config KEXEC_AUTO_RESERVE
> +	bool "automatically reserve memory for kexec kernel"
> +	depends on KEXEC
> +	default y
> +	---help---
> +	  Automatically reserve memory for a kexec kernel, so that you don't
> +	  need to specify numbers for the "crashkernel=X@Y" boot option,
> +	  instead you can use "crashkernel=auto".
> +	  On x86, 128M is reserved.

The obvious problem is the hardcoded 128MB (and 128MB is very large
for a crash kernel anyways)

More useful would seem a crashkernel=size@...o

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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