linux-kernel - Re: [RFC v2 0/2] Early use of boot service memory

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Message-ID: <e48c784c-a7e3-4aca-a2e8-3e9591bbaf98@email.android.com>
Date:	Thu, 21 Nov 2013 18:42:14 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	Yinghai Lu <yinghai@...nel.org>, jerry.hoemann@...com,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Rob Landley <rob@...dley.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Borislav Petkov <bp@...e.de>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-efi@...r.kernel.org, Pekka Enberg <penberg@...nel.org>,
	Ingo Molnar <mingo.kernel.org@...il.com>
Subject: Re: [RFC v2 0/2] Early use of boot service memory

Various DMA-deficient devices, at least without an iommu.

Vivek Goyal <vgoyal@...hat.com> wrote:
>On Thu, Nov 21, 2013 at 05:31:54PM -0800, H. Peter Anvin wrote:
>> On 11/21/2013 05:29 PM, Yinghai Lu wrote:
>> > On Thu, Nov 21, 2013 at 5:25 PM,  <jerry.hoemann@...com> wrote:
>> >> On Thu, Nov 21, 2013 at 05:12:57PM -0800, H. Peter Anvin wrote:
>> >>
>> >> Large systems w/ lots of IO require large crash kernel allocations
>for
>> >> the kernel to boot.  Then you have to worry about the OOM
>killer.....
>> > 
>> > so go with crashkernel=1024M,high.
>> > 
>> 
>> Yes, there is no bloody excuse to hog that much low memory.
>
>Curious, why is low memory precious on x86_64? Who is going to use it?
>
>Thanks
>Vivek

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