From: "rob pike" <rob@plan9.bell-labs.com>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] Virtual memory & paging
Date: Sun, 3 Feb 2002 16:21:08 -0500 [thread overview]
Message-ID: <c8685c768718ef790629270acb1927c5@plan9.bell-labs.com> (raw)
I don't know that anyone else makes this distinction, but to me
virtual memory is a technique an operating system can use to manage
user memory, while paging is a technique for coping with a shortfall
in physical memory. VM manages memory by using page faults to fill in
the user address space; paging is just swapping a page at a time. The
relationship between these notions is primarily that both permit the
process to execute when it is not entirely resident.
By these definitions, it is possible (easy even) to build a system
with virtual memory but no paging. Even I can do it.
-rob
next reply other threads:[~2002-02-03 21:21 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-03 21:21 rob pike [this message]
2002-02-04 21:46 ` skipt
2002-02-04 22:11 ` Ronald G Minnich
[not found] ` <Pine.LNX.4.33.0202041510540.4327-100000@snaresland.acl.lan l.gov>
2002-02-05 1:30 ` skipt
2002-02-05 15:32 ` Ronald G Minnich
-- strict thread matches above, loose matches on Subject: below --
2002-02-15 14:32 Richard Uhtenwoldt
2002-02-16 21:56 ` Ronald G Minnich
2002-02-05 10:57 geoff
2002-02-05 11:37 ` Boyd Roberts
2002-02-05 14:01 ` david presotto
2002-02-04 11:03 Fco.J.Ballesteros
2002-02-04 10:59 forsyth
2002-02-04 10:38 geoff
2002-02-04 11:16 ` Boyd Roberts
2002-02-04 11:45 ` Boyd Roberts
2002-02-04 17:10 ` Andrew Simmons
2002-02-05 11:17 ` Boyd Roberts
2002-03-30 4:26 ` Richard Maxwell Underwood
2002-02-05 9:53 ` Thomas Bushnell, BSG
2002-02-05 16:06 ` Ronald G Minnich
2002-02-04 10:30 forsyth
2002-02-03 23:08 geoff
2002-02-03 20:26 ` Andrew Simmons
2002-02-04 16:15 ` Ronald G Minnich
2002-02-04 6:21 ` Richard Uhtenwoldt
2002-02-03 21:53 presotto
2002-02-03 22:36 ` Andrew Simmons
2002-02-03 21:12 andrey mirtchovski
2002-02-03 21:01 Andrew Simmons
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