From: Rik van Riel <riel@conectiva.com.br>
To: Jon Goldberg <jgoldberg@neocore.com>
Cc: Andrew Morton <akpm@digeo.com>, linux-mm@kvack.org
Subject: RE: Porting to from Solaris 64bit to Linux 32B - 36B.
Date: Wed, 20 Nov 2002 16:31:40 -0200 (BRST) [thread overview]
Message-ID: <Pine.LNX.4.44L.0211201629170.4103-100000@imladris.surriel.com> (raw)
In-Reply-To: <C5BF7C2C6ADF24448763CC46235FB3A691C833@ulysses.neocore.com>
On Wed, 20 Nov 2002, Jon Goldberg wrote:
> Will that return a 64 bit offset pointer to the file or just let
> me map 3-4GB in a 10 BG file with a 64 bit offset pointer. What I would
> like to do is mmap the full 10GB file and walk it with a 64 bit pointer
> knowing that not more that 2GB can be in memory.
How exactly do you think the mythical mmap64() would ever work
on 32 bit machines ?
It is impossible to map 10 GB of file into 2-3 GB of virtual
address space.
Maybe there is a userspace library to emulate things with (slow)
64 bit pointers, etc... but it is fundamentally impossible to do
in kernel space.
regards,
Rik
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next prev parent reply other threads:[~2002-11-20 18:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-20 17:36 Jon Goldberg
2002-11-20 18:31 ` Rik van Riel [this message]
[not found] <C5BF7C2C6ADF24448763CC46235FB3A691C82E@ulysses.neocore.com>
2002-11-20 0:24 ` Rik van Riel
2002-11-20 8:33 ` Andrew Morton
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