From: paul.winalski@gmail.com (Paul Winalski)
Subject: [TUHS] /dev/drum
Date: Mon, 30 Apr 2018 12:43:50 -0400 [thread overview]
Message-ID: <CABH=_VQcDma-wamSK8+ncMRq0UQYY4Py8Dte4vOJm7XQf75qXg@mail.gmail.com> (raw)
In-Reply-To: <20180430150532.4B67218C09C@mercury.lcs.mit.edu>
On 4/30/18, Noel Chiappa <jnc at mercury.lcs.mit.edu> wrote:
>
> There's also the System 360 approach, where processes share a single
> address
> space (physical memory - no virtual memory on them!), but it uses
> protection
> keys on memory 'chunks' (not sure of the correct IBM term) to ensure that
> one
> process can't tromp on another's memory.
IBM always used the term "storage" rather than "memory". The Storage
Protection feature for System/360 was optional on some models, and
provided a 4-bit protection key for each 2048-byte block (IBM's term)
of physical storage, allowing for up to 15 processes to be executing
simultaneously (key value 0 disabled storage protection).
The System/370 operating systems DOS/VS, OS/VS1, and OS/VS2 SVS all
had a single, demand-paged virtual address space, usually a few times
larger than the physical memory. For DOS/VS the virtual address space
was partitioned into a space (mapped virtual=physical address)
starting at address 0 for the OS, then up to five user program
partitions. Programs were linked to run in one of these partitions.
OS/VS1 (successor to OS/360 MFT) also had a single virtual address
space, but it had more partitions and the program loader could
dynamically relocate applications to run in any of the partitions.
OS/VS2 SVS (first successor to OS/360 MVT) had a single virtual
address space, but dynamically allocated partitions as needed. OS/VS2
MVS had processes in the modern OS sense--each executing program got
its own virtual address space.
-Paul W.
next prev parent reply other threads:[~2018-04-30 16:43 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-30 15:05 Noel Chiappa
2018-04-30 16:43 ` Paul Winalski [this message]
2018-04-30 21:41 ` Johnny Billquist
2018-05-03 2:54 ` Charles Anthony
[not found] <mailman.1.1525744802.16322.tuhs@minnie.tuhs.org>
2018-05-08 22:39 ` Johnny Billquist
-- strict thread matches above, loose matches on Subject: below --
2018-05-07 15:36 Noel Chiappa
2018-05-06 13:07 Noel Chiappa
2018-05-06 15:57 ` Johnny Billquist
2018-05-05 13:06 Noel Chiappa
2018-05-05 20:53 ` Johnny Billquist
2018-05-03 11:39 Noel Chiappa
2018-05-03 21:22 ` Johnny Billquist
2018-04-28 20:40 Noel Chiappa
2018-04-29 15:37 ` Johnny Billquist
2018-04-29 16:34 ` Steve Nickolas
2018-04-29 16:48 ` Warner Losh
2018-04-28 0:19 Noel Chiappa
2018-04-28 10:41 ` Johnny Billquist
2018-04-28 12:19 ` Rico Pajarola
2018-04-27 23:01 Noel Chiappa
2018-04-27 23:10 ` Johnny Billquist
2018-04-27 23:39 ` Warner Losh
[not found] <mailman.1.1524708001.6296.tuhs@minnie.tuhs.org>
2018-04-27 22:41 ` Johnny Billquist
2018-04-26 1:53 Noel Chiappa
[not found] <mailman.143.1524696952.3788.tuhs@minnie.tuhs.org>
2018-04-25 23:08 ` Johnny Billquist
2018-04-25 22:55 Noel Chiappa
[not found] <mailman.139.1524690859.3788.tuhs@minnie.tuhs.org>
2018-04-25 22:54 ` Johnny Billquist
2018-04-25 22:46 Noel Chiappa
[not found] <mailman.137.1524667148.3788.tuhs@minnie.tuhs.org>
2018-04-25 21:43 ` Johnny Billquist
2018-04-25 22:24 ` Johnny Billquist
2018-04-26 5:51 ` Tom Ivar Helbekkmo
2018-04-25 22:37 ` Johnny Billquist
2018-04-24 7:10 Rudi Blom
[not found] <mailman.125.1524526228.3788.tuhs@minnie.tuhs.org>
2018-04-23 23:44 ` Johnny Billquist
2018-04-23 23:57 ` Steve Nickolas
2018-04-24 0:24 ` Ronald Natalie
2018-04-24 0:25 ` Warren Toomey
2018-04-24 0:31 ` Dave Horsfall
2018-04-24 1:02 ` Lyndon Nerenberg
2018-04-24 4:32 ` Grant Taylor
2018-04-24 4:49 ` Bakul Shah
2018-04-24 4:59 ` Warner Losh
2018-04-24 6:22 ` Bakul Shah
2018-04-24 14:57 ` Warner Losh
2018-04-24 6:46 ` Lars Brinkhoff
2018-04-23 22:01 Noel Chiappa
2018-04-23 22:09 ` Warner Losh
2018-04-23 18:41 Noel Chiappa
2018-04-23 19:09 ` Clem Cole
2018-04-23 23:01 ` Dave Horsfall
2018-04-23 23:49 ` Dave Horsfall
2018-04-24 0:26 ` Ronald Natalie
2018-04-22 18:06 Norman Wilson
2018-04-20 16:45 Noel Chiappa
2018-04-20 16:53 ` Charles Anthony
2018-04-20 17:16 ` William Pechter
2018-04-20 23:35 ` Dave Horsfall
2018-04-22 11:48 ` Steve Simon
2018-04-20 15:02 Tim Bradshaw
2018-04-20 15:58 ` Clem Cole
2018-04-20 16:00 ` David Collantes
2018-04-20 16:12 ` Dan Cross
2018-04-20 16:21 ` Clem Cole
2018-04-20 16:33 ` Warner Losh
2018-04-20 19:17 ` Ron Natalie
2018-04-20 20:23 ` Clem Cole
2018-04-20 22:10 ` Dave Horsfall
2018-04-22 17:01 ` Lars Brinkhoff
2018-04-22 17:37 ` Clem Cole
2018-04-22 19:14 ` Bakul Shah
2018-04-22 20:58 ` Mutiny
2018-04-22 22:37 ` Clem cole
2018-04-22 21:51 ` Dave Horsfall
2018-04-25 1:27 ` Dan Stromberg
2018-04-25 12:18 ` Ronald Natalie
2018-04-25 13:39 ` Tim Bradshaw
2018-04-25 14:02 ` arnold
2018-04-25 14:59 ` tfb
2018-04-25 14:33 ` Ian Zimmerman
2018-04-25 14:46 ` Larry McVoy
2018-04-25 15:03 ` ron minnich
2018-04-25 20:29 ` Paul Winalski
2018-04-25 20:45 ` Larry McVoy
2018-04-25 21:14 ` Lawrence Stewart
2018-04-25 21:30 ` ron minnich
2018-04-25 23:01 ` Bakul Shah
2018-04-23 16:42 ` Tim Bradshaw
2018-04-23 17:30 ` Ron Natalie
2018-04-23 17:51 ` Clem Cole
2018-04-23 18:30 ` Ron Natalie
2018-04-25 14:02 ` Tom Ivar Helbekkmo
2018-04-25 14:38 ` Clem Cole
2018-04-23 20:47 ` Grant Taylor
2018-04-23 21:06 ` Clem Cole
2018-04-23 21:14 ` Dan Mick
2018-04-23 21:27 ` Clem Cole
2018-04-23 22:07 ` Tim Bradshaw
2018-04-23 22:15 ` Warner Losh
2018-04-23 23:30 ` Grant Taylor
2018-04-24 9:37 ` Michael Kjörling
2018-04-24 9:57 ` Dave Horsfall
2018-04-24 13:01 ` Nemo
2018-04-24 13:03 ` Arthur Krewat
2018-04-23 23:45 ` Arthur Krewat
2018-04-24 8:05 ` tfb
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