linux-kernel - Re: [RFC 00/15] x86_64: Optimize percpu accesses

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Message-ID: <48764DA5.1080503@zytor.com>
Date:	Thu, 10 Jul 2008 13:57:57 -0400
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses

Eric W. Biederman wrote:
>>>
>> No, it's not irrelevant; we currently base the kernel at virtual address -2 GB
>> (KERNEL_IMAGE_START) + CONFIG_PHYSICAL_START, in order to have the proper
>> alignment for large pages.
> 
> Ugh.  That is silly.  We need to restrict CONFIG_PHYSICAL_START to the aligned
> choices obviously.  But -2G is better aligned then anything else we can do virtually.
> 

You may think it's silly, but it's actually an advantage in this case.

	-hpa
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