From: James Bottomley <James.Bottomley@steeleye.com>
To: knaresh@india.hp.com
Cc: Matthew Wilcox <willy@debian.org>,
PARISC list <parisc-linux@lists.parisc-linux.org>
Subject: Re: [parisc-linux] MAX_ADDRESS.
Date: 30 Sep 2003 08:17:22 -0500 [thread overview]
Message-ID: <1064927843.2065.3.camel@mulgrave> (raw)
In-Reply-To: <3F7975FE.58C276D9@india.hp.com>
On Tue, 2003-09-30 at 07:24, Naresh wrote:
> MAX_ADDRESS has nothing to do with DISCONTIGMEM. Its definition is generic(
> pgtable.h), although it is not used anywhere. I just happened to see the comment in
> the DISCONTIGMEM code. Even if DISCONTIGMEM is turned off, there is no check for
> MAX_ADDRESS before the call to 'map_pages()' in 'pagetable_init( )', which is why I
> would like to know if MAX_ADDRESS can be ignored.
No. It does represent the highest virtual address possible.
Linux has 3 levels of page tables, so on a 64 bit kernel (8 bytes per
pte and 8 bytes per pte page pointer etc), we can address a maximum of
512GB with 4k pages.
James
prev parent reply other threads:[~2003-09-30 13:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-30 5:33 [parisc-linux] MAX_ADDRESS Naresh
2003-09-30 12:06 ` Matthew Wilcox
2003-09-30 12:24 ` Naresh
2003-09-30 13:17 ` James Bottomley [this message]
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