From: Lyndon Nerenberg <lyndon@orthanc.ca>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Cc: Lyndon Nerenberg <lyndon@orthanc.ca>
Subject: Re: [9fans] PDP11 (Was: Re: what heavy negativity!)
Date: Tue, 9 Oct 2018 10:45:37 -0700 [thread overview]
Message-ID: <7aa1f60316858415@orthanc.ca> (raw)
In-Reply-To: <20181009001435.B6DDA156E40C@mail.bitblocks.com>
Bakul Shah writes:
> One thing I have mused about is recasting plan9 as a
> microkernel and pushing out a lot of its kernel code into user
> mode code. It is already half way there -- it is basically a
> mux for 9p calls, low level device drivers, VM support & some
> process related code.
Somewhat related to this ... after reading some papers on
TCP-in-user-space implementations, I've been thinking about how an
interface that supported fast/secure page flipping between the
kernel and process address space would change how we do things.
E.g. right now Plan 9 suffers from a *lot* of data copying between
the kernel and processes, and between processes themselves. If we
could eliminate most of that copying, things would get a lot faster.
Dealing with the security issues isn't trivial, but the programmer
time going into eeking out the last bit of I/O throughput of the
current scheme could be redirected.
If it works, this would reduce the kernel back to handling
process/memory management, and talking to the hardware. Not a
micro-kernel, but just as good from a practical standpoint.
And no, this wouldn't get us to running on the 11/70. But by taking
advantage of modern large virtual memory spaces by using page
flipping, we could cut down on physical memory usage in the kernel.
--lyndon
next prev parent reply other threads:[~2018-10-09 17:45 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-08 3:38 Lucio De Re
2018-10-08 4:29 ` Digby R.S. Tarvin
2018-10-08 7:20 ` hiro
2018-10-08 12:03 ` Charles Forsyth
2018-10-08 17:20 ` hiro
2018-10-08 21:55 ` Digby R.S. Tarvin
2018-10-08 23:03 ` Dan Cross
2018-10-09 0:14 ` Bakul Shah
2018-10-09 1:34 ` Christopher Nielsen
2018-10-09 3:28 ` Lucio De Re
2018-10-09 8:23 ` hiro
2018-10-09 9:45 ` Ethan Gardener
2018-10-09 17:50 ` Bakul Shah
2018-10-09 18:57 ` Ori Bernstein
2018-10-10 7:32 ` Giacomo Tesio
2018-10-09 17:45 ` Lyndon Nerenberg [this message]
2018-10-09 18:49 ` hiro
2018-10-09 19:14 ` Lyndon Nerenberg
2018-10-09 22:05 ` erik quanstrom
2018-10-11 17:54 ` Lyndon Nerenberg
2018-10-11 18:04 ` Kurt H Maier
2018-10-11 19:23 ` hiro
2018-10-11 19:24 ` hiro
2018-10-11 19:25 ` hiro
2018-10-11 19:26 ` Skip Tavakkolian
2018-10-11 19:39 ` Lyndon Nerenberg
2018-10-11 19:44 ` Skip Tavakkolian
2018-10-11 19:47 ` Lyndon Nerenberg
2018-10-11 19:57 ` hiro
2018-10-11 20:23 ` Lyndon Nerenberg
2018-10-10 10:42 ` Ethan Gardener
2018-10-09 19:23 ` Lyndon Nerenberg
2018-10-09 19:34 ` hiro
2018-10-09 19:36 ` hiro
2018-10-09 19:40 ` Lyndon Nerenberg
2018-10-10 0:18 ` Dan Cross
2018-10-10 5:45 ` hiro
2018-10-09 22:06 ` erik quanstrom
2018-10-10 6:24 ` Bakul Shah
2018-10-10 13:58 ` erik quanstrom
2018-10-09 22:42 ` Dan Cross
2018-10-09 19:09 ` Bakul Shah
2018-10-09 19:30 ` Lyndon Nerenberg
2018-10-09 3:08 ` Digby R.S. Tarvin
2018-10-09 3:16 ` [9fans] PDP11 David Arnold
2018-10-09 4:52 ` Digby R.S. Tarvin
2018-10-09 11:58 ` [9fans] PDP11 (Was: Re: what heavy negativity!) Ethan Gardener
2018-10-09 13:59 ` erik quanstrom
2018-10-09 22:22 ` Digby R.S. Tarvin
2018-10-10 10:38 ` Ethan Gardener
2018-10-10 23:15 ` Digby R.S. Tarvin
2018-10-11 18:10 ` Lyndon Nerenberg
2018-10-11 20:55 ` Digby R.S. Tarvin
2018-10-11 21:03 ` Lyndon Nerenberg
2018-10-09 14:02 ` erik quanstrom
2018-10-08 8:12 ` Nils M Holm
2018-10-08 9:12 ` Digby R.S. Tarvin
2018-10-08 8:09 ` Nils M Holm
2018-10-09 19:47 cinap_lenrek
2018-10-09 22:01 ` erik quanstrom
2018-10-09 23:43 ` Lyndon Nerenberg
2018-10-10 5:52 ` hiro
2018-10-10 8:13 ` Digby R.S. Tarvin
2018-10-10 9:14 ` hiro
2018-10-10 13:59 ` Steve Simon
2018-10-10 21:32 ` Digby R.S. Tarvin
2018-10-11 17:43 ` Lyndon Nerenberg
2018-10-11 19:11 ` hiro
2018-10-11 19:27 ` Lyndon Nerenberg
2018-10-11 19:56 ` hiro
2018-10-10 5:57 ` hiro
2018-10-09 19:49 cinap_lenrek
2018-10-09 19:56 ` hiro
2018-10-10 0:15 cinap_lenrek
2018-10-10 0:22 ` Lyndon Nerenberg
2018-10-10 16:14 cinap_lenrek
2018-10-10 17:34 cinap_lenrek
2018-10-10 21:54 ` Steven Stallion
2018-10-10 22:29 ` Kurt H Maier
2018-10-10 22:55 ` Steven Stallion
2018-10-11 11:19 ` Aram Hăvărneanu
2018-10-11 0:26 ` Skip Tavakkolian
2018-10-11 1:03 ` Steven Stallion
2018-10-14 9:46 ` Ole-Hjalmar Kristensen
2018-10-14 10:37 ` hiro
2018-10-14 17:34 ` Ole-Hjalmar Kristensen
2018-10-14 19:17 ` hiro
2018-10-15 9:29 ` Giacomo Tesio
2018-10-10 22:19 cinap_lenrek
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