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From: Jeremy Fitzhardinge <jeremy@goop.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andi Kleen <andi@firstfloor.org>, Hugh Dickins <hugh@veritas.com>,
	Christoph Lameter <clameter@sgi.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Ingo Molnar <mingo@elte.hu>,
	KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	LKML <linux-kernel@vger.kernel.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Bart Van Assche <bart.vanassche@gmail.com>
Subject: Re: quicklists confuse meminfo
Date: Mon, 10 Mar 2008 14:26:16 -0700	[thread overview]
Message-ID: <47D5A778.3020500@goop.org> (raw)
In-Reply-To: <47D5A000.6000407@zytor.com>

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

  reply	other threads:[~2008-03-10 21:27 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-09 10:19 Thomas Gleixner
2008-03-09 10:26 ` Bart Van Assche
2008-03-09 10:29 ` Andi Kleen
2008-03-09 10:42 ` KOSAKI Motohiro
2008-03-09 12:00   ` Thomas Gleixner
2008-03-09 11:14 ` Ingo Molnar
2008-03-09 11:56   ` Thomas Gleixner
2008-03-09 12:01     ` Ingo Molnar
2008-03-09 12:49       ` Andi Kleen
2008-03-10 15:51         ` Christoph Lameter
2008-03-09 12:03   ` Johannes Weiner
2008-03-09 12:03   ` KOSAKI Motohiro
2008-03-09 12:09     ` Ingo Molnar
2008-03-09 12:34       ` Ingo Molnar
2008-03-09 12:51         ` KOSAKI Motohiro
2008-03-09 13:20         ` Thomas Gleixner
2008-03-09 18:46         ` Andrew Morton
2008-03-09 20:21           ` Andi Kleen
2008-03-10 15:54           ` Christoph Lameter
2008-03-10 16:43             ` Andi Kleen
2008-03-10 17:19               ` Hugh Dickins
2008-03-10 17:25                 ` Andi Kleen
2008-03-10 17:31                 ` Jeremy Fitzhardinge
2008-03-10 17:53                   ` Andi Kleen
2008-03-10 18:35                     ` Jeremy Fitzhardinge
2008-03-10 19:06                       ` Andi Kleen
2008-03-10 20:54                       ` H. Peter Anvin
2008-03-10 21:26                         ` Jeremy Fitzhardinge [this message]
2008-03-11  4:07             ` Nick Piggin
2008-03-21 12:52               ` Bart Van Assche
2008-03-21 14:45                 ` Ingo Molnar
2008-03-26  7:45                   ` Bart Van Assche
2008-03-26  7:53                     ` Andrew Morton
2008-03-26  8:13                     ` Ingo Molnar
2008-03-26 10:37                       ` Bart Van Assche
2008-03-26 16:34                         ` Christoph Lameter
2008-03-27  9:48                           ` Bart Van Assche
2008-03-09 19:11         ` Arjan van de Ven
2008-03-09 19:25           ` Ingo Molnar
2008-03-09 19:27             ` Ingo Molnar
2008-03-09 19:31               ` Ingo Molnar
2008-03-10 15:57               ` Christoph Lameter
2008-03-10 15:55             ` Christoph Lameter
2008-03-09 12:47       ` KOSAKI Motohiro

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