linux-kernel - Re: quicklists confuse meminfo

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Message-ID: <47D5A778.3020500@goop.org>
Date:	Mon, 10 Mar 2008 14:26:16 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Andi Kleen <andi@...stfloor.org>, Hugh Dickins <hugh@...itas.com>,
	Christoph Lameter <clameter@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Bart Van Assche <bart.vanassche@...il.com>
Subject: Re: quicklists confuse meminfo

H. Peter Anvin wrote:
> Jeremy Fitzhardinge wrote:
>>
>> Yeah, the most fundamental problem is that the whole page is RO, so 
>> even if Xen trapped and emulated, it still makes a very bad 
>> neighbour.  I was also going to say that there's no reason why you 
>> couldn't pack multiple pgds into one page, but I think we can only 
>> specify the cr3 at page resolution anyway.
>>
>
> Wrong.  With PAE you can specify it at any 32-byte boundary. 

Yes, the x86 lets you, but Xen doesn't - mostly because it reuses the 
lower 12 bits as upper bits of the pfn so that you can specify a 
pagetable base at >4G.

    J
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