linux-kernel - Re: [PATCH 0/3] Early use of boot service memory

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Message-ID: <52840206.5020006@zytor.com>
Date:	Wed, 13 Nov 2013 14:49:42 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	jerry.hoemann@...com
CC:	rob@...dley.net, tglx@...utronix.de, mingo@...hat.com,
	x86@...nel.org, matt.fleming@...el.com, yinghai@...nel.org,
	penberg@...nel.org, akpm@...ux-foundation.org,
	linux-doc@...r.kernel.org, linux-efi@...r.kernel.org,
	vgoyal@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] Early use of boot service memory

On 11/13/2013 02:45 PM, jerry.hoemann@...com wrote:
> 
> The changes in 3.9 to allow crash kernel to be allocated high helps. 
> But as you say, the default is still to allocate crash kernel low and
> still susceptible to this problem.  So, a kdump expert can work around it.
> But, not everyone is a kdump expert.
> 
> So, we can work to change the default, or encourage the distros
> to always allocate high.  Or, we change the call to efi_reserve_boot_services
> not apply to all platforms.
> 
> The problems for pre 3.9 based distros is worse as they don't have
> ability to allocate crash kernel high.
> 

But they won't have your new option, either, and that is still horribly
manual and system-dependent.

In other words, allocating the crashkernel high has ALL the advantages,
plus a few more, and NONE of the disadvantages.

	-hpa


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