linux-kernel - Re: [PATCH] x86: 46 bit PAE support

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Message-ID: <4A02EFD2.40707@zytor.com>
Date:	Thu, 07 May 2009 07:27:30 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Pavel Machek <pavel@....cz>, Rik van Riel <riel@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, mingo@...hat.com, akpm@...ux-foundation.org
Subject: Re: [PATCH] x86: 46 bit PAE support

Ingo Molnar wrote:
> 
> Yes, struct page is ~64 bytes, and 64*64 == 4096.
> 
> Alas, it's not a problem: my suggestion wasnt to simulate 64 TB of 
> RAM. My suggestion was to create a sparse physical memory map (in a 
> virtual machine) that spreads ~1GB of RAM all around the 64 TB 
> physical address space. That will test whether the kernel is able to 
> map and work with such physical addresses. (which will cover most of 
> the issues)
> 
> A good look at /debug/x86/dump_pagetables with such a system booted 
> up would be nice as well - to make sure every virtual memory range 
> is in its proper area, and that there's enough free space around 
> them.
> 

We're working on simulating this at Intel.  We should hopefully be able
to test this next week.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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