From: Andi Kleen <andi@firstfloor.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>, Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Thomas Gleixner <tglx@linutronix.de>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
Alexander Viro <viro@ftp.linux.org.uk>,
linux-kernel@vger.kernel.org
Subject: Re: [announce] "kill the Big Kernel Lock (BKL)" tree
Date: Thu, 15 May 2008 00:21:50 +0200 [thread overview]
Message-ID: <482B65FE.4040402@firstfloor.org> (raw)
In-Reply-To: <alpine.LFD.1.10.0805141515020.3019@woody.linux-foundation.org>
Linus Torvalds wrote:
>
> On Thu, 15 May 2008, Andi Kleen wrote:
>> The goal less being to get rid of BKL in old drivers, but not
>> requiring BKL in new drivers. Basically all BKL assumptions
>> in interfaces really should go.
>
> No, we really do want to get rid of BKL in old drivers too. Or at least in
> the interfaces.
In the interfaces definitely yes and all subsystems should have their
own lock_kernel calls, but why in the old drivers? For those it's very
unlikely they are used on any SMP system anyways (e.g. anything
depending on CONFIG_ISA) or if they do only on 2 CPU systems.
Of course if you can find someone to do the work it wouldn't be
bad, just wouldn't seem like a particularly useful investment of time to
me.
Also it would be bad if the people who did such conversions didn't
actually test it and that's a great danger with many old drivers because
nearly nobody has the hardware (and if they do it won't be in a SMP system)
-Andi
next prev parent reply other threads:[~2008-05-14 22:22 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-14 17:49 [announce] "kill the Big Kernel Lock (BKL)" tree Ingo Molnar
2008-05-14 18:30 ` Andi Kleen
2008-05-14 21:00 ` Alan Cox
2008-05-14 21:13 ` Andi Kleen
2008-05-14 21:16 ` H. Peter Anvin
2008-05-14 21:17 ` Alan Cox
2008-05-14 21:19 ` Alan Cox
2008-05-14 21:45 ` Linus Torvalds
2008-05-14 22:03 ` Andi Kleen
2008-05-15 13:34 ` Alan Cox
2008-05-15 14:27 ` Andi Kleen
2008-05-15 15:36 ` Alan Cox
2008-05-16 10:21 ` Andi Kleen
2008-05-15 8:02 ` Ingo Molnar
2008-05-14 18:41 ` Linus Torvalds
2008-05-14 19:41 ` Ingo Molnar
2008-05-14 20:05 ` Frederik Deweerdt
2008-05-14 21:45 ` Jonathan Corbet
2008-05-14 21:39 ` Alan Cox
2008-05-14 21:56 ` Linus Torvalds
2008-05-14 22:07 ` Jonathan Corbet
2008-05-14 22:14 ` Linus Torvalds
2008-05-22 20:20 ` Alan Cox
2008-05-16 15:44 ` [PATCH, RFC] char dev BKL pushdown Jonathan Corbet
2008-05-16 15:49 ` Christoph Hellwig
2008-05-16 16:03 ` [PATCH] kill empty chardev open/release methods Christoph Hellwig
2008-05-16 16:24 ` Alan Cox
2008-05-16 20:55 ` Alan Cox
2008-05-18 19:46 ` Jonathan Corbet
2008-05-18 19:58 ` Alan Cox
2008-05-16 16:22 ` [PATCH, RFC] char dev BKL pushdown Alan Cox
2008-05-16 16:30 ` Linus Torvalds
2008-05-16 16:43 ` Jonathan Corbet
2008-05-17 21:15 ` Arnd Bergmann
2008-05-18 20:26 ` Jonathan Corbet
2008-05-19 23:07 ` Arnd Bergmann
[not found] ` <200805200111.47275.arnd@arndb.de>
2008-05-19 23:14 ` [PATCH 2/3, RFC] watchdog " Arnd Bergmann
2008-05-20 6:20 ` Christoph Hellwig
2008-05-20 8:30 ` Arnd Bergmann
2008-05-20 15:47 ` Wim Van Sebroeck
2008-05-20 18:31 ` Alan Cox
2008-05-20 21:00 ` Arnd Bergmann
2008-05-22 9:34 ` Alan Cox
2008-05-20 9:08 ` Alan Cox
2008-05-20 8:42 ` Alan Cox
2008-05-19 23:26 ` [PATCH 1/3, RFC] misc char " Arnd Bergmann
2008-05-20 0:07 ` Mike Frysinger
2008-05-20 0:21 ` Jonathan Corbet
2008-05-20 0:46 ` Mike Frysinger
2008-05-20 8:46 ` Alan Cox
2008-05-20 23:01 ` Mike Frysinger
2008-05-20 23:25 ` Jonathan Corbet
2008-05-21 16:22 ` Mike Frysinger
2008-05-19 23:34 ` [PATCH 3/3, RFC] remove BKL from misc_open() Arnd Bergmann
2008-05-20 15:13 ` [PATCH, RFC] char dev BKL pushdown Jonathan Corbet
2008-05-20 17:21 ` Arnd Bergmann
2008-05-20 18:51 ` Alan Cox
2008-05-17 21:58 ` Linus Torvalds
2008-05-18 20:07 ` Jonathan Corbet
2008-05-14 22:11 ` [announce] "kill the Big Kernel Lock (BKL)" tree Andi Kleen
2008-05-14 22:16 ` Linus Torvalds
2008-05-14 22:21 ` Andi Kleen [this message]
2008-05-15 13:30 ` Alan Cox
2008-05-15 15:05 ` John Stoffel
2008-05-15 15:10 ` Andi Kleen
2008-05-15 15:18 ` John Stoffel
2008-05-15 15:45 ` Andi Kleen
2008-05-15 8:44 ` Jan Engelhardt
2008-05-15 14:54 ` Diego Calleja
2008-05-14 21:46 ` Alan Cox
2008-05-14 22:11 ` Linus Torvalds
2008-05-14 22:15 ` Andi Kleen
2008-05-15 17:41 ` Linus Torvalds
2008-05-15 20:27 ` Arjan van de Ven
2008-05-15 20:45 ` Peter Zijlstra
2008-05-15 21:22 ` Arjan van de Ven
2008-05-17 0:14 ` Kevin Winchester
2008-05-17 0:37 ` Kevin Winchester
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