From: Karim Yaghmour <karim@opersys.com>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Wolfgang Denk <wd@denx.de>, linux-kernel@vger.kernel.org
Subject: Re: patent on O_ATOMICLOOKUP [Re: [PATCH] loopable tmpfs (2.4.17)]
Date: Sat, 25 May 2002 15:14:40 -0400 [thread overview]
Message-ID: <3CEFE2A0.18166785@opersys.com> (raw)
In-Reply-To: <Pine.LNX.4.44.0205251138390.17649-100000@home.transmeta.com>
Linus Torvalds wrote:
> "..every single spinlock in the kernel assumes that the kernel isn't
> preempted, which means that user apps that can preempt the kernel
> cannot use them."
I misread this paragraph, the rest of my reply follows from this laps.
I said there was no "priority inversion" in the sense that there are
no priority inversion problems during the execution of such user-space
rt tasks. From a purely static perspective, however, the user-space
rt tasks do indeed come to have a higher priority than the kernel.
No fuss there.
That being said, I differ on your judgement of this method.
Karim
===================================================
Karim Yaghmour
karim@opersys.com
Embedded and Real-Time Linux Expert
===================================================
next prev parent reply other threads:[~2002-05-25 19:16 UTC|newest]
Thread overview: 179+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.21.0204292127480.1709-100000@localhost.localdomain>
[not found] ` <3CEDF94C.592636A6@kegel.com>
[not found] ` <3CEDFCED.D10CD618@zip.com.au>
[not found] ` <3CEE806D.D52FBEA5@kegel.com>
2002-05-24 20:26 ` patent on O_ATOMICLOOKUP [Re: [PATCH] loopable tmpfs (2.4.17)] Andrea Arcangeli
2002-05-24 21:18 ` Anton Altaparmakov
2002-05-24 21:18 ` Karim Yaghmour
2002-05-24 21:46 ` Linus Torvalds
2002-05-24 23:05 ` Karim Yaghmour
2002-05-24 23:22 ` Larry McVoy
2002-05-24 23:53 ` Alexander Viro
2002-05-25 4:31 ` Karim Yaghmour
2002-05-25 4:44 ` Larry McVoy
2002-05-25 5:20 ` Karim Yaghmour
2002-05-25 5:39 ` Larry McVoy
2002-05-25 6:05 ` Karim Yaghmour
2002-05-25 7:59 ` Thunder from the hill
2002-05-25 16:14 ` Larry McVoy
2002-05-25 16:20 ` Karim Yaghmour
2002-05-25 16:25 ` Larry McVoy
2002-05-25 16:41 ` Karim Yaghmour
2002-05-25 22:47 ` Robert Schwebel
2002-05-26 1:06 ` Andrew Morton
2002-05-26 5:45 ` Robert Schwebel
2002-05-25 17:47 ` Kurt Wall
2002-05-25 18:13 ` Wolfgang Denk
2002-05-25 19:21 ` Daniel Phillips
2002-05-25 18:32 ` Karim Yaghmour
2002-05-25 18:38 ` Mark Mielke
2002-05-25 17:22 ` Linus Torvalds
2002-05-25 17:49 ` Karim Yaghmour
2002-05-25 20:07 ` Daniel Phillips
2002-05-25 20:29 ` Andre Hedrick
2002-05-26 2:53 ` Alan Cox
2002-05-26 2:17 ` Andre Hedrick
2002-05-25 20:53 ` Linus Torvalds
2002-05-25 21:19 ` Karim Yaghmour
2002-05-25 17:50 ` Wolfgang Denk
2002-05-25 18:02 ` Larry McVoy
2002-05-25 18:26 ` Wolfgang Denk
2002-05-25 18:44 ` Larry McVoy
2002-05-25 19:04 ` Wolfgang Denk
2002-05-25 19:52 ` Karim Yaghmour
2002-05-25 20:36 ` Larry McVoy
2002-05-25 20:51 ` Wolfgang Denk
2002-05-25 21:05 ` Larry McVoy
2002-05-25 21:20 ` Wolfgang Denk
2002-05-25 21:23 ` Larry McVoy
2002-05-26 2:46 ` Alan Cox
2002-05-26 3:33 ` Larry McVoy
2002-05-25 21:44 ` Daniel Phillips
2002-05-25 23:16 ` Robert Schwebel
[not found] ` <200205260255.g4Q2tkM62553@saturn.cs.uml.edu>
2002-05-26 5:48 ` Robert Schwebel
2002-05-27 5:28 ` Calin A. Culianu
2002-05-27 22:12 ` Mark Mielke
2002-05-25 21:14 ` Karim Yaghmour
2002-05-26 2:09 ` David Schleef
2002-05-26 3:17 ` Larry McVoy
2002-05-26 3:45 ` David Schleef
2002-05-26 4:03 ` Larry McVoy
2002-05-26 19:40 ` Alan Cox
2002-05-26 19:06 ` Larry McVoy
2002-05-26 20:17 ` Alexander Viro
2002-05-26 20:33 ` Larry McVoy
2002-05-26 21:33 ` Alan Cox
2002-05-26 20:44 ` Larry McVoy
2002-05-26 9:13 ` patent on O_ATOMICLOOKUP [Re: [PATCH] loopable tmpfs (2.4.17)]y Der Herr Hofrat
2002-05-26 14:13 ` Robert Schwebel
2002-05-26 16:31 ` Karim Yaghmour
2002-05-26 3:58 ` patent on O_ATOMICLOOKUP [Re: [PATCH] loopable tmpfs (2.4.17)] Alexander Viro
2002-05-26 4:13 ` Larry McVoy
2002-05-26 7:30 ` Alexander Viro
2002-05-26 14:42 ` yodaiken
2002-05-26 16:17 ` Karim Yaghmour
2002-05-26 16:27 ` Larry McVoy
2002-05-25 18:12 ` Linus Torvalds
2002-05-25 18:22 ` Karim Yaghmour
2002-05-25 18:33 ` Mark Mielke
2002-05-25 18:45 ` Karim Yaghmour
2002-05-25 23:27 ` Robert Schwebel
2002-05-25 18:44 ` Linus Torvalds
2002-05-25 19:14 ` Karim Yaghmour [this message]
2002-05-25 19:41 ` Daniel Phillips
2002-05-25 18:30 ` Wolfgang Denk
2002-05-25 18:52 ` Linus Torvalds
2002-05-25 21:22 ` Albert D. Cahalan
2002-05-25 21:33 ` Larry McVoy
2002-05-25 21:39 ` Karim Yaghmour
2002-05-25 21:55 ` Wolfgang Denk
2002-05-25 22:05 ` Larry McVoy
2002-05-25 22:13 ` Karim Yaghmour
2002-05-25 22:17 ` Wolfgang Denk
2002-05-25 23:10 ` Larry McVoy
2002-05-25 23:54 ` Wolfgang Denk
2002-05-26 4:05 ` Larry McVoy
2002-05-26 6:25 ` Karim Yaghmour
2002-05-25 23:56 ` Robert Schwebel
2002-05-26 3:40 ` Larry McVoy
2002-05-26 8:05 ` Robert Schwebel
2002-05-26 8:58 ` Wolfgang Denk
2002-05-25 22:19 ` Thomas Gleixner
2002-05-25 22:34 ` Erwin Rol
2002-05-25 23:17 ` Larry McVoy
2002-05-25 23:37 ` Robert Schwebel
2002-05-25 23:46 ` Larry McVoy
2002-05-26 0:01 ` Robert Schwebel
2002-05-26 10:11 ` David Woodhouse
2002-05-26 13:04 ` Roman Zippel
2002-05-26 13:26 ` yodaiken
2002-05-26 14:09 ` Roman Zippel
2002-05-26 14:21 ` yodaiken
2002-05-26 15:30 ` Roman Zippel
2002-05-26 16:55 ` yodaiken
2002-05-26 18:00 ` Karim Yaghmour
2002-05-26 18:29 ` Larry McVoy
2002-05-26 21:45 ` Karim Yaghmour
2002-05-26 21:58 ` Wolfgang Denk
2002-05-26 22:12 ` Erwin Rol
2002-05-26 22:34 ` Robert Schwebel
2002-05-26 22:07 ` Mark Mielke
2002-05-26 22:18 ` Karim Yaghmour
2002-05-26 18:20 ` Roman Zippel
2002-05-26 15:58 ` Nicholas Knight
2002-05-27 2:42 ` Daniel Phillips
2002-05-25 22:58 ` Robert Schwebel
2002-05-26 0:48 ` Erik Andersen
2002-05-26 5:31 ` Robert Schwebel
2002-05-26 10:19 ` Erik Andersen
2002-05-25 6:08 ` Daniel Phillips
2002-05-25 4:48 ` Karim Yaghmour
2002-05-25 5:00 ` Larry McVoy
2002-05-25 9:02 ` Robert Schwebel
2002-05-25 17:34 ` Oliver Xymoron
2002-05-24 23:27 ` Linus Torvalds
2002-05-25 3:13 ` Karim Yaghmour
2002-05-25 3:25 ` Linus Torvalds
2002-05-25 3:46 ` Karim Yaghmour
2002-05-25 4:08 ` Linus Torvalds
2002-05-25 4:25 ` Larry McVoy
2002-05-25 4:27 ` Linus Torvalds
2002-05-25 5:53 ` Daniel Phillips
2002-05-25 4:52 ` Karim Yaghmour
2002-05-25 9:08 ` Robert Schwebel
2002-05-25 17:27 ` Linus Torvalds
2002-05-25 20:30 ` Daniel Phillips
2002-05-26 2:51 ` Alan Cox
2002-05-26 4:11 ` Daniel Phillips
2002-05-26 19:37 ` Alan Cox
2002-05-26 20:05 ` Daniel Phillips
2002-05-27 15:27 ` Pavel Machek
2002-05-25 22:33 ` Robert Schwebel
2002-05-26 0:07 ` Linus Torvalds
2002-05-25 20:34 ` Pierre Cloutier
2002-05-26 0:44 ` Linus Torvalds
2002-05-25 21:03 ` Pierre Cloutier
2002-05-26 0:39 ` Linus Torvalds
2002-05-26 3:12 ` Oliver Xymoron
2002-05-26 4:20 ` Linus Torvalds
2002-05-26 4:25 ` yodaiken
2002-05-26 13:50 ` Oliver Xymoron
2002-05-26 3:28 ` patent on O_ATOMICLOOKUP - Warning actual technical content yodaiken
2002-05-26 3:36 ` Karim Yaghmour
2002-05-26 4:00 ` Andrew Morton
2002-05-26 5:38 ` Karim Yaghmour
2002-05-26 1:21 ` patent on O_ATOMICLOOKUP [Re: [PATCH] loopable tmpfs (2.4.17)] Roman Zippel
2002-05-26 5:44 ` Daniel Phillips
2002-05-27 4:12 ` Calin A. Culianu
2002-05-25 9:05 ` Robert Schwebel
2002-05-25 8:59 ` Realtime Linux Situation Robert Schwebel
2002-05-24 21:57 ` patent on O_ATOMICLOOKUP [Re: [PATCH] loopable tmpfs (2.4.17)] Andreas Dilger
2002-05-24 22:37 ` Alan Cox
2002-05-24 23:09 ` Andreas Dilger
2002-05-27 17:36 ` Siemens powermanagment patent? [was Re: patent on O_ATOMICLOOKUP [Re: [PATCH] loopable tmpfs (2.4.17)]] Pavel Machek
2002-05-27 21:36 ` Alan Cox
2002-05-24 21:56 ` patent on O_ATOMICLOOKUP [Re: [PATCH] loopable tmpfs (2.4.17)] Alexander Viro
2002-05-24 22:46 ` Alan Cox
2002-05-24 22:53 ` Alexander Viro
2002-05-27 21:52 Adam J. Richter
2002-05-27 23:26 ` Alan Cox
-- strict thread matches above, loose matches on Subject: below --
2002-05-28 6:29 peter
2002-05-28 11:42 ` Alan Cox
2002-05-29 11:25 Robert Kaiser
2002-05-30 22:37 patent on O_ATOMICLOOKUP [Re: [PATCH] loopable tmpfs (2.4.17) ] Ed Vance
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