From: Tony Luck <aegl@yahoo.com>
To: linux-kernel@vger.kernel.org
Subject: Re: Virtual address space exhaustion (was Discontigmem virt_to_page() )
Date: Fri, 3 May 2002 11:37:01 -0700 (PDT) [thread overview]
Message-ID: <20020503183701.32163.qmail@web13505.mail.yahoo.com> (raw)
Richard B. Johnson wrote:
> One of the Unix characteristics is that the kernel
> address space is shared with each of the process
> address space.
This hasn't been an absolute requirement. There have
been 32-bit Unix implementations that gave separate
4G address spaces to the kernel and to each user
process. The only real downside to this is that
copyin()/copyout() are more complex. Some processors
provided special instructions to access user-mode
addresses from kernel to mitigate this complexity.
-Tony
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next reply other threads:[~2002-05-03 18:37 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-05-03 18:37 Tony Luck [this message]
2002-05-03 19:01 ` Richard B. Johnson
2002-04-27 1:15 ` Pavel Machek
2002-05-03 19:09 ` Christoph Hellwig
2002-05-03 19:17 ` Richard B. Johnson
2002-05-03 19:24 ` Christoph Hellwig
2002-05-03 19:38 ` Matti Aarnio
2002-05-03 19:50 ` Tony Luck
2002-05-03 20:22 ` Jeff Dike
2002-05-03 19:30 ` Richard B. Johnson
2002-05-03 22:35 ` Martin J. Bligh
2002-05-05 0:49 ` Denis Vlasenko
2002-05-05 17:59 ` Martin J. Bligh
-- strict thread matches above, loose matches on Subject: below --
2002-05-03 8:38 Bug: Discontigmem virt_to_page() [Alpha,ARM,Mips64?] Andrea Arcangeli
2002-05-03 15:17 ` Virtual address space exhaustion (was Discontigmem virt_to_page() ) Martin J. Bligh
2002-05-03 15:58 ` Andrea Arcangeli
2002-05-03 16:10 ` Martin J. Bligh
2002-05-03 16:25 ` Andrea Arcangeli
2002-05-03 16:02 ` Daniel Phillips
2002-05-03 16:20 ` Andrea Arcangeli
2002-05-03 16:41 ` Daniel Phillips
2002-05-03 16:58 ` Andrea Arcangeli
2002-05-03 18:08 ` Daniel Phillips
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