From: Chris Wedgwood <cw@f00f.org>
To: Matti Aarnio <matti.aarnio@zmailer.org>
Cc: Adam Shand <larry@spack.org>, linux-kernel@vger.kernel.org
Subject: Re: What is the truth about Linux 2.4's RAM limitations?
Date: Wed, 11 Jul 2001 01:49:20 +1200 [thread overview]
Message-ID: <20010711014920.D31799@weta.f00f.org> (raw)
In-Reply-To: <Pine.LNX.4.32.0107091250170.25061-100000@maus.spack.org> <20010710011755.M18653@mea-ext.zmailer.org>
In-Reply-To: <20010710011755.M18653@mea-ext.zmailer.org>
On Tue, Jul 10, 2001 at 01:17:55AM +0300, Matti Aarnio wrote:
Compound that with unability to have separate user and kernel
mappings active at the same time (unlike e.g. Motorola 68000
family MMUs do), and the userspace can't have even that 4GB,
but is limited to at least 3.5/0.5 (user/kernel) split, more
commonly to 3.0/1.0 split.
How does FreeBSD do this? What about other OSs? Do they map out most
of userland on syscall entry and map it in as required for their
equivalents to copy_to/from_user? (Taking the performance hit in doing
so?)
--cw
next prev parent reply other threads:[~2001-07-10 13:49 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-07-09 20:01 Adam Shand
2001-07-09 21:15 ` Brian Gerst
2001-07-09 21:18 ` Rik van Riel
2001-07-09 22:17 ` Matti Aarnio
2001-07-10 13:49 ` Chris Wedgwood [this message]
2001-07-10 17:03 ` Timur Tabi
2001-07-10 17:35 ` Richard B. Johnson
2001-07-10 18:01 ` Timur Tabi
2001-07-10 18:08 ` Jonathan Lundell
2001-07-10 18:45 ` Richard B. Johnson
2001-07-10 19:26 ` Jonathan Lundell
2001-07-10 23:56 ` Jesse Pollard
2001-07-10 20:19 ` Malcolm Beattie
2001-07-10 3:01 ` jlnance
2001-07-10 3:29 ` Michael Bacarella
2001-07-16 8:37 ` Ingo Oeser
[not found] <Pine.LNX.4.32.0107091250170.25061-100000@maus.spack.org.suse.lists.linux.kernel>
2001-07-09 21:03 ` Andi Kleen
2001-07-09 21:29 Jesse Pollard
2001-07-10 17:01 ` Timur Tabi
2001-07-10 18:12 Jesse Pollard
2001-07-10 18:22 ` Jonathan Lundell
2001-07-10 18:28 ` Brian Gerst
2001-07-10 18:43 ` Chris Wedgwood
2001-07-10 19:35 ` Brian Gerst
2001-07-10 18:38 Jesse Pollard
2001-07-10 19:14 ` Mark H. Wood
2001-07-10 21:49 Jesse Pollard
2001-07-10 22:07 ` Jonathan Lundell
2001-07-11 4:31 alad
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