From: Robert Love <rml@tech9.net>
To: Pavel Machek <pavel@suse.cz>
Cc: Helge Hafting <helgehaf@aitel.hist.no>,
Rob Landley <landley@trommello.org>,
linux-kernel@vger.kernel.org
Subject: Re: Preempt & how long it takes to interrupt (was Re: [2.4.17/18pre] VM and swap - it's really unusable)
Date: 20 Jan 2002 15:22:16 -0500 [thread overview]
Message-ID: <1011558138.8596.317.camel@phantasy> (raw)
In-Reply-To: <20020118224140.GI6918@elf.ucw.cz>
In-Reply-To: <E16P0vl-0007Tu-00@the-village.bc.nu> <1010781207.819.27.camel@phantasy> <20020111195018.A2008@hq.fsmlabs.com> <20020112042404.WCSI23959.femail47.sdc1.sfba.home.com@there> <3C42CA59.F070C2B8@aitel.hist.no> <20020118224140.GI6918@elf.ucw.cz>
On Fri, 2002-01-18 at 17:41, Pavel Machek wrote:
> So... how long do you have to stay in interrupt for it to be a bug?
>
> There's *no* requirement that says "it may not take second to handle
> an interrupt". Actually I guess that some nasty conditions (UHCI needs
> reset?) may take that long in interrupt. Oh and actually few releases
> ago, console switching was done from interrupt and it *did* take 2
> seconds for me.
>
> If someone assumes interrupts are "short", he has broken code already.
Agreed. Conversely, however, writing code that introduces long
interrupt-off periods should be considered a BUG.
In other words, relying on short interrupt-off periods is bad form, but
so is writing gross code that rudely keeps them off.
I think we all considered the long off periods in VT switching and fbdev
a bug.
Robert Love
next prev parent reply other threads:[~2002-01-20 20:18 UTC|newest]
Thread overview: 351+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-08 3:02 [2.4.17/18pre] VM and swap - it's really unusable Dieter Nützel
2002-01-08 10:55 ` Luigi Genoni
2002-01-08 13:21 ` Andrea Arcangeli
2002-01-08 13:33 ` Anton Blanchard
2002-01-08 15:00 ` Daniel Phillips
2002-01-08 15:29 ` Andrea Arcangeli
2002-01-08 15:54 ` Daniel Phillips
2002-01-08 16:38 ` Andrea Arcangeli
2002-01-08 23:02 ` Luigi Genoni
2002-01-08 23:32 ` Ken Brownfield
2002-01-08 23:42 ` Robert Love
2002-01-08 23:52 ` Luigi Genoni
2002-01-09 0:10 ` Alan Cox
2002-01-09 0:29 ` John Alvord
2002-01-09 0:43 ` Robert Love
2002-01-09 16:58 ` Kent Borg
2002-01-14 1:28 ` Bill Davidsen
2002-01-14 1:54 ` Alan Cox
2002-01-14 20:12 ` george anzinger
2002-01-10 19:08 ` Jussi Laako
2002-01-09 5:08 ` Andrew Morton
2002-01-09 5:42 ` Robert Love
2002-01-09 9:08 ` Helge Hafting
2002-01-09 17:00 ` Alan Cox
2002-01-09 11:44 ` Rob Landley
2002-01-09 19:57 ` Andrew Morton
2002-01-10 16:40 ` Timothy Covell
2002-01-10 2:25 ` Alan Cox
2002-01-10 10:06 ` Rob Landley
2002-01-10 18:34 ` Chris Friesen
2002-01-10 19:36 ` David Weinehall
2002-01-10 20:00 ` Chris Friesen
2002-01-10 20:13 ` Jussi Laako
2002-01-10 20:52 ` Bernd Eckenfels
2002-01-10 19:01 ` Alan Cox
2002-01-11 2:47 ` Nigel Gamble
2002-01-11 3:18 ` Andrew Morton
2002-01-11 12:37 ` Alan Cox
2002-01-11 20:33 ` Robert Love
2002-01-12 2:50 ` yodaiken
2002-01-11 20:22 ` Rob Landley
2002-01-12 5:00 ` yodaiken
2002-01-12 11:53 ` Roman Zippel
2002-01-12 12:28 ` yodaiken
2002-01-12 13:25 ` Roman Zippel
2002-01-12 14:56 ` yodaiken
2002-01-12 17:48 ` Roman Zippel
2002-01-12 19:23 ` yodaiken
2002-01-12 21:21 ` Roman Zippel
2002-01-13 1:23 ` Alan Cox
2002-01-14 23:21 ` george anzinger
2002-01-15 0:59 ` yodaiken
2002-01-15 9:18 ` Helge Hafting
2002-01-12 20:12 ` Andrew Morton
2002-01-12 18:46 ` Alan Cox
2002-01-12 20:42 ` Roman Zippel
2002-01-12 22:13 ` yodaiken
2002-01-13 3:33 ` Roman Zippel
2002-01-13 4:02 ` yodaiken
2002-01-13 1:28 ` Alan Cox
2002-01-12 5:03 ` Andrew Morton
2002-01-12 18:26 ` Jussi Laako
2002-01-12 6:01 ` Robert Love
2002-01-12 12:45 ` yodaiken
2002-01-12 19:00 ` Alan Cox
2002-01-13 0:16 ` Robert Love
2002-01-13 1:41 ` Alan Cox
2002-01-13 22:50 ` Daniel Phillips
2002-01-12 9:52 ` arjan
2002-01-12 18:54 ` Alan Cox
2002-01-12 19:23 ` Ed Sweetman
2002-01-12 19:35 ` yodaiken
2002-01-12 20:09 ` Alan Cox
2002-01-20 0:08 ` Pavel Machek
2002-01-12 19:26 ` Robert Love
2002-01-12 19:36 ` yodaiken
2002-01-12 20:07 ` Alan Cox
2002-01-12 20:03 ` Robert Love
2002-01-12 20:21 ` Alan Cox
2002-01-13 3:10 ` Robert Love
2002-01-13 11:39 ` Russell King
2002-01-13 18:24 ` Robert Love
2002-01-13 19:06 ` Russell King
2002-01-13 19:30 ` Alan Cox
2002-01-13 15:59 ` Alan Cox
2002-01-13 18:20 ` Robert Love
2002-01-14 5:59 ` Daniel Phillips
2002-01-13 22:23 ` Rob Landley
2002-01-13 22:02 ` Daniel Phillips
2002-01-12 20:36 ` Kenneth Johansson
2002-01-12 23:01 ` Robert Love
2002-01-13 0:02 ` J Sloan
2002-01-13 1:38 ` Alan Cox
2002-01-13 15:18 ` Roman Zippel
2002-01-13 15:36 ` Arjan van de Ven
2002-01-14 5:03 ` Daniel Phillips
2002-01-14 5:09 ` Andrew Morton
2002-01-14 9:24 ` Daniel Phillips
2002-01-14 5:34 ` yodaiken
2002-01-14 11:14 ` Roman Zippel
2002-01-14 11:47 ` Alan Cox
2002-01-14 12:00 ` Roman Zippel
2002-01-14 12:27 ` Alan Cox
2002-01-14 13:39 ` Roman Zippel
2002-01-14 14:35 ` Alan Cox
2002-01-14 14:30 ` Roman Zippel
2002-01-14 14:35 ` Rik van Riel
2002-01-14 16:19 ` Roman Zippel
2002-01-14 20:05 ` Robert Love
2002-01-14 20:02 ` Andrew Morton
2002-01-14 21:19 ` Alan Cox
2002-01-14 21:11 ` Andrew Morton
2002-01-14 21:30 ` Alan Cox
2002-01-14 13:38 ` yodaiken
2002-01-14 14:40 ` Roman Zippel
2002-01-14 14:07 ` Guest section DW
2002-01-14 12:17 ` Momchil Velikov
2002-01-14 12:45 ` Oliver Neukum
2002-01-14 16:32 ` Momchil Velikov
2002-01-14 17:43 ` Alan Cox
2002-01-14 22:34 ` Momchil Velikov
2002-01-14 22:46 ` yodaiken
[not found] ` <876664vxm8.fsf@fadata.bg>
2002-01-15 12:31 ` yodaiken
2002-01-20 10:31 ` george anzinger
2002-01-20 14:34 ` yodaiken
2002-01-14 18:04 ` Oliver Neukum
2002-01-14 20:09 ` Robert Love
2002-01-14 20:22 ` Oliver Neukum
2002-01-14 20:36 ` Robert Love
2002-01-14 22:46 ` Oliver Neukum
2002-01-15 3:01 ` george anzinger
2002-01-14 13:45 ` yodaiken
2002-01-14 13:48 ` yodaiken
2002-01-14 14:56 ` Roman Zippel
2002-01-14 16:18 ` yodaiken
2002-01-14 18:54 ` Roman Zippel
2002-01-14 16:36 ` Momchil Velikov
[not found] ` <20020114030925.A1363@viejo.fsmlabs.com>
2002-01-14 18:43 ` Daniel Phillips
2002-01-14 18:39 ` yodaiken
2002-01-14 20:16 ` Robert Love
2002-01-14 19:16 ` Rick Stevens
2002-01-15 3:07 ` george anzinger
2002-01-15 3:31 ` Daniel Phillips
2002-01-15 12:39 ` yodaiken
2002-01-21 15:38 ` Daniel Phillips
2002-01-21 15:43 ` yodaiken
2002-01-21 16:05 ` Daniel Phillips
2002-01-21 16:06 ` yodaiken
2002-01-21 16:33 ` Peter Wächtler
2002-01-21 16:45 ` yodaiken
2002-01-21 17:12 ` Peter Wächtler
2002-01-21 17:15 ` yodaiken
2002-01-21 16:48 ` Daniel Phillips
2002-01-21 16:50 ` yodaiken
2002-01-21 17:32 ` Chris Friesen
2002-01-21 17:52 ` yodaiken
2002-01-21 18:59 ` Chris Friesen
2002-01-21 19:00 ` Peter Wächtler
2002-01-21 21:22 ` Robert Love
2002-01-21 21:54 ` yodaiken
2002-01-21 22:19 ` Robert Love
2002-01-21 22:18 ` Horst von Brand
2002-01-21 22:53 ` Chris Friesen
2002-01-29 23:12 ` Bill Davidsen
2002-01-21 21:24 ` Robert Love
2002-01-21 21:16 ` Robert Love
2002-01-21 21:33 ` Andrew Morton
2002-01-21 21:59 ` J Sloan
2002-01-21 21:49 ` yodaiken
2002-01-21 22:01 ` Robert Love
2002-01-21 20:52 ` Marcelo Tosatti
2002-01-21 22:26 ` Robert Love
2002-01-21 23:56 ` yodaiken
2002-01-22 0:45 ` Roman Zippel
2002-01-22 1:34 ` yodaiken
2002-01-22 9:13 ` Roman Zippel
2002-01-22 2:10 ` Daniel Phillips
2002-01-24 15:19 ` yodaiken
2002-01-24 21:15 ` Roman Zippel
2002-01-26 2:36 ` Jamie Lokier
2002-01-29 23:36 ` Bill Davidsen
2002-01-22 0:27 ` Roman Zippel
2002-01-21 19:26 ` Mark Hahn
2002-01-21 20:16 ` Allan Sandfeld
2002-01-22 10:57 ` Peter Wächtler
2002-01-21 20:35 ` Bill Davidsen
2002-01-21 20:49 ` yodaiken
2002-01-21 21:42 ` Mark Hahn
2002-01-22 0:58 ` Ken Brownfield
2002-01-22 16:51 ` Bill Davidsen
2002-01-22 20:50 ` Jussi Laako
2002-01-29 23:05 ` Bill Davidsen
2002-01-29 23:33 ` Alan Cox
2002-01-14 17:36 ` Daniel Phillips
2002-01-14 15:08 ` Russ Leighton
2002-01-14 8:24 ` Arjan van de Ven
2002-01-13 15:45 ` Alan Cox
2002-01-13 20:25 ` Roman Zippel
2002-01-13 21:11 ` Alan Cox
2002-01-14 0:33 ` Stephan von Krawczynski
2002-01-14 0:50 ` Alan Cox
2002-01-14 1:17 ` Robert Love
2002-01-14 9:49 ` Stephan von Krawczynski
2002-01-14 9:45 ` Stephan von Krawczynski
2002-01-14 10:04 ` Andrew Morton
2002-01-14 11:47 ` Stephan von Krawczynski
2002-01-14 12:29 ` Alan Cox
2002-01-14 22:20 ` Jussi Laako
2002-01-15 1:43 ` Stephan von Krawczynski
2002-01-15 20:29 ` Jussi Laako
2002-01-14 19:58 ` george anzinger
2002-01-14 10:09 ` Alan Cox
2002-01-14 15:02 ` J.A. Magallon
2002-01-14 15:03 ` Arjan van de Ven
2002-01-14 19:50 ` george anzinger
2002-01-14 19:35 ` Robert Love
2002-01-14 15:46 ` Rob Landley
2002-01-14 22:03 ` Jussi Laako
2002-01-15 1:34 ` Stephan von Krawczynski
2002-01-14 0:10 ` yodaiken
2002-01-14 0:41 ` Roman Zippel
2002-01-14 1:05 ` yodaiken
2002-01-14 10:16 ` Roman Zippel
2002-01-14 1:19 ` Robert Love
2002-01-13 18:13 ` Robert Love
2002-01-14 1:50 ` Rik van Riel
2002-01-14 1:56 ` Robert Love
2002-01-14 10:55 ` Roman Zippel
[not found] ` <16QNVQ-2JqEACC@fwd03.sul.t-online.com>
[not found] ` <3C43D5E1.6785695C@mvista.com>
2002-01-15 8:32 ` Oliver Neukum
2002-01-13 1:30 ` Alan Cox
2002-01-12 20:53 ` Roman Zippel
2002-01-12 23:07 ` Rob Landley
2002-01-13 16:03 ` Alan Cox
2002-01-13 1:26 ` Alan Cox
2002-01-13 13:34 ` Roman Zippel
2002-01-13 15:19 ` Alan Cox
2002-01-13 22:06 ` Daniel Phillips
2002-01-14 7:22 ` Alans example against preemtive kernel (Was: Re: [2.4.17/18pre] VM and swap - it's really unusable) Roger Larsson
2002-01-14 9:18 ` Alan Cox
2002-01-14 12:08 ` [2.4.17/18pre] VM and swap - it's really unusable Helge Hafting
2002-01-18 22:41 ` Preempt & how long it takes to interrupt (was Re: [2.4.17/18pre] VM and swap - it's really unusable) Pavel Machek
2002-01-20 11:22 ` Rob Landley
2002-01-21 21:48 ` Alan Cox
2002-01-22 11:52 ` Rob Landley
2002-01-27 20:37 ` Alan Cox
2002-01-27 22:10 ` Nigel Gamble
2002-01-27 22:56 ` Preempt & how long it takes to interrupt (was Re: [2.4.17/18pre]u Alan Cox
2002-01-20 20:22 ` Robert Love [this message]
2002-01-12 11:13 ` [2.4.17/18pre] VM and swap - it's really unusable Andrea Arcangeli
2002-01-12 15:07 ` jogi
2002-01-12 16:05 ` Andrea Arcangeli
2002-01-13 15:15 ` jogi
2002-01-12 16:52 ` yodaiken
2002-01-12 17:00 ` Andrea Arcangeli
2002-01-12 19:00 ` Ed Sweetman
2002-01-12 20:23 ` Andrew Morton
2002-01-12 21:02 ` Erik Andersen
2002-01-12 21:18 ` Stephan von Krawczynski
2002-01-12 23:24 ` Erik Andersen
2002-01-12 21:16 ` Stephan von Krawczynski
2002-01-12 22:25 ` Francois Romieu
2002-01-13 1:32 ` Alan Cox
2002-01-13 1:57 ` J.A. Magallon
2002-01-13 8:03 ` Rusty Russell
2002-01-13 17:42 ` jogi
2002-01-13 18:22 ` Robert Love
2002-01-13 19:32 ` Alan Cox
2002-01-14 11:41 ` Andrea Arcangeli
2002-01-13 19:35 ` J Sloan
2002-01-14 6:49 ` Daniel Phillips
2002-01-15 1:31 ` J Sloan
2002-01-13 19:46 ` Andrew Morton
2002-01-13 20:04 ` Robert Love
2002-01-13 20:30 ` Andrew Morton
2002-01-14 11:56 ` Andrea Arcangeli
2002-01-14 13:38 ` Robert Love
2002-01-14 15:45 ` Andrea Arcangeli
2002-01-13 20:17 ` jogi
[not found] ` <Pine.LNX.4.33.0201131533530.14774-100000@coffee.psychology.mcmaster.ca>
2002-01-13 22:14 ` jogi
2002-01-13 23:52 ` yodaiken
2002-01-14 11:39 ` Andrea Arcangeli
[not found] ` <3C40A6BB.1090100@pobox.com>
2002-01-14 11:34 ` Andrea Arcangeli
2002-01-14 20:27 ` Andrew Morton
2002-01-13 15:22 ` jogi
2002-01-14 23:05 ` george anzinger
2002-01-13 15:18 ` jogi
2002-01-13 17:51 ` yodaiken
2002-01-13 18:10 ` jogi
2002-01-13 18:11 ` Robert Love
2002-01-14 11:32 ` Andrea Arcangeli
2002-01-13 22:55 ` Daniel Phillips
2002-01-13 22:56 ` Robert Love
2002-01-14 0:11 ` yodaiken
2002-01-14 11:18 ` Marian Jancar
2002-01-14 14:16 ` yodaiken
2002-01-14 2:46 ` Pavel Machek
2002-01-10 9:59 ` Ken Brownfield
2002-01-10 11:04 ` Alan Cox
2002-01-09 0:13 ` Dieter Nützel
2002-01-09 6:26 ` Daniel Phillips
2002-01-09 7:25 ` Preemtive kernel (Was: Re: [2.4.17/18pre] VM and swap - it's really unusable) Roger Larsson
2002-01-09 7:48 ` Daniel Phillips
2002-01-08 20:55 ` [2.4.17/18pre] VM and swap - it's really unusable Robert Love
2002-01-09 11:24 ` Andrea Arcangeli
2002-01-09 14:07 ` Ed Sweetman
2002-01-09 14:27 ` Andrea Arcangeli
2002-01-09 14:51 ` Arjan van de Ven
2002-01-09 17:02 ` Roger Larsson
2002-01-09 17:10 ` Arjan van de Ven
2002-01-09 17:13 ` Daniel Phillips
2002-01-08 19:47 ` Andrew Morton
2002-01-08 20:13 ` Alan Cox
2002-01-08 22:00 ` Roger Larsson
2002-01-08 20:18 ` Daniel Phillips
2002-01-08 21:19 ` Robert Love
2002-01-14 1:08 ` Bill Davidsen
2002-01-08 20:59 ` Daniel Phillips
2002-01-08 21:08 ` Rik van Riel
2002-01-08 21:15 ` Robert Love
2002-01-08 21:24 ` Rik van Riel
2002-01-08 21:45 ` Robert Love
2002-01-08 22:31 ` Andrew Morton
2002-01-08 21:51 ` Daniel Phillips
2002-01-08 21:10 ` Andrew Morton
2002-01-08 21:17 ` Robert Love
2002-01-08 21:57 ` Daniel Phillips
2002-01-08 22:01 ` Robert Love
2002-01-14 1:22 ` Bill Davidsen
2002-01-08 22:21 ` Andrew Morton
2002-01-09 9:17 ` Daniel Phillips
2002-01-09 9:26 ` Andrew Morton
2002-01-09 9:48 ` Daniel Phillips
2002-01-08 23:26 ` Luigi Genoni
2002-01-09 6:36 ` Daniel Phillips
2002-01-08 21:08 ` Robert Love
2002-01-09 0:31 ` Oliver Xymoron
2002-01-09 9:50 ` Helge Hafting
2002-01-08 17:41 ` Luigi Genoni
2002-01-14 0:46 ` Bill Davidsen
2002-01-14 1:14 ` yodaiken
2002-01-14 2:04 ` Andrew Morton
2002-01-16 15:15 ` Bill Davidsen
2002-01-14 9:08 ` Daniel Phillips
2002-01-14 9:08 ` Daniel Phillips
2002-01-14 9:08 ` Daniel Phillips
2002-01-14 16:40 ` Daniel Phillips
2002-01-14 17:42 ` Alan Cox
2002-01-14 21:28 ` J Sloan
2002-01-08 13:51 ` J.A. Magallon
[not found] ` <E16OHLf-0000Dn-00@starship.berlin>
[not found] ` <20020109145509.G1543@inspiron.school.suse.de>
2002-01-09 14:07 ` Daniel Phillips
2002-01-09 14:22 ` Andrea Arcangeli
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