From: Bryan Henderson <hbryan@us.ibm.com>
To: Avi Kivity <avi@argo.co.il>
Cc: Al Boldi <a1426z@gawab.com>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC] VM: I have a dream...
Date: Mon, 23 Jan 2006 11:52:13 -0800 [thread overview]
Message-ID: <OF9B696195.5A30AEF3-ON882570FF.006879C2-882570FF.006D26D2@us.ibm.com> (raw)
In-Reply-To: <43D28189.3080407@argo.co.il>
>Perhaps you'd be interested in single-level store architectures, where
>no distinction is made between memory and storage. IBM uses it in one
>(or maybe more) of their systems.
It's the IBM Eserver I Series, nee System/38 (A.D. 1980), aka AS/400.
It was expected at one time to be the next generation of computer
architecture, but it turned out that the computing world had matured to
the point that it was more important to be backward compatible than to
push frontiers.
The single 128 bit address space addresses every byte of information in
the system. The underlying system keeps the majority of it on disk, and
the logic that loads stuff into electronic memory when it has to be there
is below the level that any ordinary program would see, much like the
logic in an IA32 CPU that loads stuff into processor cache. It's worth
noting that nowhere in an I Series machine is a layer that looks like a
CPU Linux runs on; it's designed for single level storage from the gates
on up through the operating system.
I found Al's dream rather vague, which explains why several people
inferred different ideas from it (and then beat them down). It sort of
sounds like single level storage, but also like virtual memory and like
mmap. I assume it's actually supposed to be something different from all
those.
I personally have set my sights further down the road: I want an address
space that addresses every byte of information in the universe, not just
"in" a computer system. And the infrastructure should move it around
among various media for optimal access without me worrying about it.
--
Bryan Henderson IBM Almaden Research Center
San Jose CA Filesystems
next prev parent reply other threads:[~2006-01-23 19:52 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-21 18:08 [RFC] VM: I have a dream Al Boldi
2006-01-21 18:42 ` Jamie Lokier
2006-01-21 18:46 ` Avi Kivity
2006-01-23 19:52 ` Bryan Henderson [this message]
2006-01-25 22:04 ` Al Boldi
2006-01-26 19:18 ` Bryan Henderson
2006-01-27 16:12 ` Al Boldi
2006-01-27 19:17 ` Bryan Henderson
2006-01-30 13:21 ` Al Boldi
2006-01-30 13:35 ` Kyle Moffett
2006-01-31 15:56 ` Al Boldi
2006-01-31 16:34 ` Kyle Moffett
2006-01-31 23:14 ` Bryan Henderson
2006-01-31 16:34 ` Lennart Sorensen
2006-01-31 19:23 ` Jamie Lokier
2006-02-01 4:06 ` Barry K. Nathan
2006-02-01 9:51 ` Andrew Walrond
2006-02-01 17:51 ` Lennart Sorensen
2006-02-01 18:21 ` Andrew Walrond
2006-02-01 18:25 ` Lennart Sorensen
2006-02-02 15:11 ` Alan Cox
2006-02-02 18:59 ` Al Boldi
2006-02-02 22:33 ` Bryan Henderson
2006-02-03 14:46 ` Alan Cox
2006-01-30 16:49 ` Bryan Henderson
2006-01-26 0:03 ` Jon Smirl
2006-01-26 19:48 ` Bryan Henderson
2006-01-22 8:16 ` Pavel Machek
2006-01-22 12:33 ` Robin Holt
2006-01-23 18:03 ` Al Boldi
2006-01-23 18:40 ` Valdis.Kletnieks
2006-01-23 19:26 ` Benjamin LaHaise
2006-01-23 19:40 ` Valdis.Kletnieks
2006-01-23 22:26 ` Pavel Machek
2006-01-22 19:55 ` Barry K. Nathan
2006-01-23 5:23 ` Michael Loftis
2006-01-23 5:46 ` Chase Venters
2006-01-23 8:20 ` Barry K. Nathan
2006-01-23 13:17 ` Jamie Lokier
2006-01-23 20:21 ` Peter Chubb
2006-01-23 15:05 ` Ram Gupta
2006-01-23 15:26 ` Diego Calleja
2006-01-23 16:11 ` linux-os (Dick Johnson)
2006-01-23 16:50 ` Jamie Lokier
2006-01-24 2:08 ` Horst von Brand
2006-01-25 6:13 ` Jamie Lokier
2006-01-25 9:23 ` Bernd Petrovitsch
2006-01-25 9:42 ` Lee Revell
2006-01-25 15:02 ` Jamie Lokier
2006-01-25 23:24 ` Lee Revell
2006-01-25 15:05 ` Jamie Lokier
2006-01-25 15:47 ` Bernd Petrovitsch
2006-01-25 16:09 ` Diego Calleja
2006-01-25 17:26 ` Jamie Lokier
2006-01-26 19:13 ` Bryan Henderson
2006-01-25 23:28 ` Lee Revell
2006-01-26 1:29 ` Diego Calleja
2006-01-26 5:01 ` Jamie Lokier
2006-01-26 5:11 ` Lee Revell
2006-01-26 14:46 ` Dave Kleikamp
2006-01-24 2:10 ` Horst von Brand
2006-01-25 22:27 ` Nix
2006-01-26 15:13 ` Denis Vlasenko
2006-01-26 16:23 ` Nix
2006-01-23 20:43 ` Michael Loftis
2006-01-23 22:42 ` Nikita Danilov
2006-01-24 14:36 ` Ram Gupta
2006-01-24 15:04 ` Diego Calleja
2006-01-24 20:59 ` Bryan Henderson
2006-01-24 15:11 ` Nikita Danilov
2006-01-23 22:57 ` Ram Gupta
2006-01-24 10:08 ` Meelis Roos
2006-02-01 13:58 Al Boldi
2006-02-01 14:38 ` Jamie Lokier
2006-02-02 12:26 ` Al Boldi
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=OF9B696195.5A30AEF3-ON882570FF.006879C2-882570FF.006D26D2@us.ibm.com \
--to=hbryan@us.ibm.com \
--cc=a1426z@gawab.com \
--cc=avi@argo.co.il \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).